{
 "instance": {
  "d621362d10k.htm": {
   "axisCustom": 1,
   "axisStandard": 33,
   "contextCount": 330,
   "dts": {
    "calculationLink": {
     "local": [
      "bcow-20211231_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "bcow-20211231_def.xml"
     ]
    },
    "inline": {
     "local": [
      "d621362d10k.htm"
     ]
    },
    "labelLink": {
     "local": [
      "bcow-20211231_lab.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "bcow-20211231_pre.xml"
     ]
    },
    "schema": {
     "local": [
      "bcow-20211231.xsd"
     ],
     "remote": [
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd",
      "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd",
      "https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd",
      "https://xbrl.fasb.org/srt/2021/elts/srt-roles-2021-01-31.xsd",
      "https://xbrl.fasb.org/srt/2021/elts/srt-types-2021-01-31.xsd",
      "https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd",
      "https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd",
      "https://xbrl.fasb.org/us-gaap/2021/elts/us-types-2021-01-31.xsd",
      "https://xbrl.sec.gov/country/2021/country-2021.xsd",
      "https://xbrl.sec.gov/currency/2021/currency-2021.xsd",
      "https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd",
      "https://xbrl.sec.gov/exch/2021/exch-2021.xsd",
      "https://xbrl.sec.gov/naics/2021/naics-2021.xsd",
      "https://xbrl.sec.gov/sic/2021/sic-2021.xsd",
      "https://xbrl.sec.gov/stpr/2021/stpr-2021.xsd"
     ]
    }
   },
   "elementCount": 811,
   "entityCount": 1,
   "hidden": {
    "http://xbrl.sec.gov/dei/2021q4": 8,
    "total": 8
   },
   "keyCustom": 82,
   "keyStandard": 456,
   "memberCustom": 53,
   "memberStandard": 52,
   "nsprefix": "bcow",
   "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "1001 - Document - Cover Page",
     "role": "http://www.1895bancorpofwisconsin.com/role/CoverPage",
     "shortName": "Cover Page",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1010 - Disclosure - Summary of Significant Accounting Policies",
     "role": "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPolicies",
     "shortName": "Summary of Significant Accounting Policies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R100": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
      "reportCount": 1,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1100 - Disclosure - Stock Based Compensation - Summary of Restricted Stock Unit Activity (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail",
     "shortName": "Stock Based Compensation - Summary of Restricted Stock Unit Activity (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2019",
      "decimals": "INF",
      "lang": null,
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R101": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "bcow:CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
      "reportCount": 1,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1101 - Disclosure - Stock Based Compensation - Summary of Restricted Stock Unit Activity (Parenthetical) (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
     "shortName": "Stock Based Compensation - Summary of Restricted Stock Unit Activity (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "INF",
      "lang": null,
      "name": "bcow:SharebasedCompensationArrangementEquityInstrumentsOtherThanOptionsVestedRealtedToSharesSurrendersToCoverPayrollTaxesInPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R102": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1102 - Disclosure - Stock Based Compensation - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail",
     "shortName": "Stock Based Compensation - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1011 - Disclosure - Cash and Due from Banks",
     "role": "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanks",
     "shortName": "Cash and Due from Banks",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1012 - Disclosure - Available for Sale Securities",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecurities",
     "shortName": "Available for Sale Securities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1013 - Disclosure - Loans",
     "role": "http://www.1895bancorpofwisconsin.com/role/Loans",
     "shortName": "Loans",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1014 - Disclosure - Premises and Equipment",
     "role": "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipment",
     "shortName": "Premises and Equipment",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1015 - Disclosure - Mortgage Servicing Rights",
     "role": "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRights",
     "shortName": "Mortgage Servicing Rights",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1016 - Disclosure - Deposits",
     "role": "http://www.1895bancorpofwisconsin.com/role/Deposits",
     "shortName": "Deposits",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1017 - Disclosure -  FHLB Advances and Other Borrowings",
     "role": "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowings",
     "shortName": "FHLB Advances and Other Borrowings",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1018 - Disclosure - Employee Benefit Plans",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeBenefitPlans",
     "shortName": "Employee Benefit Plans",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1019 - Disclosure - Income Taxes",
     "role": "http://www.1895bancorpofwisconsin.com/role/IncomeTaxes",
     "shortName": "Income Taxes",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndDueFromBanks",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1002 - Statement - Consolidated Balance Sheets",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
     "shortName": "Consolidated Balance Sheets",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndDueFromBanks",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1020 - Disclosure - Commitments and Contingencies",
     "role": "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingencies",
     "shortName": "Commitments and Contingencies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ConcentrationRiskDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1021 - Disclosure - Concentration of Credit Risk",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConcentrationOfCreditRisk",
     "shortName": "Concentration of Credit Risk",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ConcentrationRiskDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1022 - Disclosure - Employee Stock Ownership Plan",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlan",
     "shortName": "Employee Stock Ownership Plan",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1023 - Disclosure - Related Party Transactions",
     "role": "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactions",
     "shortName": "Related Party Transactions",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1024 - Disclosure - Fair Value",
     "role": "http://www.1895bancorpofwisconsin.com/role/FairValue",
     "shortName": "Fair Value",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1025 - Disclosure - Equity and Regulatory Matters",
     "role": "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMatters",
     "shortName": "Equity and Regulatory Matters",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "bcow:DisclosureOfDeferredCompensationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1026 - Disclosure - Deferred Compensation",
     "role": "http://www.1895bancorpofwisconsin.com/role/DeferredCompensation",
     "shortName": "Deferred Compensation",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "bcow:DisclosureOfDeferredCompensationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1027 - Disclosure - Earnings Per Share",
     "role": "http://www.1895bancorpofwisconsin.com/role/EarningsPerShare",
     "shortName": "Earnings Per Share",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1028 - Disclosure - Stock Based Compensation",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensation",
     "shortName": "Stock Based Compensation",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1029 - Disclosure - Summary of Significant Accounting Policies (Policies)",
     "role": "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies",
     "shortName": "Summary of Significant Accounting Policies (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonStockParOrStatedValuePerShare",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD_per_Share",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1003 - Statement - Consolidated Balance Sheets (Parenthetical)",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
     "shortName": "Consolidated Balance Sheets (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonStockParOrStatedValuePerShare",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD_per_Share",
      "xsiNil": "false"
     }
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:MarketableSecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1030 - Disclosure - Available for Sale Securities (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesTables",
     "shortName": "Available for Sale Securities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:MarketableSecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1031 - Disclosure - Loans (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansTables",
     "shortName": "Loans (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1032 - Disclosure - Premises and Equipment (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentTables",
     "shortName": "Premises and Equipment (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfServicingAssetsAtAmortizedValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1033 - Disclosure - Mortgage Servicing Rights (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsTables",
     "shortName": "Mortgage Servicing Rights (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfServicingAssetsAtAmortizedValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DepositLiabilitiesTypeTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1034 - Disclosure - Deposits (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DepositsTables",
     "shortName": "Deposits (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DepositLiabilitiesTypeTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1035 - Disclosure -  FHLB Advances and Other Borrowings  (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsTables",
     "shortName": "FHLB Advances and Other Borrowings  (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1036 - Disclosure - Income Taxes (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesTables",
     "shortName": "Income Taxes (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfFairValueOffBalanceSheetRisksTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1037 - Disclosure - Commitments and Contingencies (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesTables",
     "shortName": "Commitments and Contingencies (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfFairValueOffBalanceSheetRisksTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1038 - Disclosure - Employee Stock Ownership Plan (Table)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanTable",
     "shortName": "Employee Stock Ownership Plan (Table)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRelatedPartyTransactionsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1039 - Disclosure - Related Party Transactions (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsTables",
     "shortName": "Related Party Transactions (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRelatedPartyTransactionsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestAndFeeIncomeLoansAndLeases",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1004 - Statement - Consolidated Statements of Operations",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
     "shortName": "Consolidated Statements of Operations",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestAndFeeIncomeLoansAndLeases",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1040 - Disclosure - Fair Value (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FairValueTables",
     "shortName": "Fair Value (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1041 - Disclosure - Equity and Regulatory Matters (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersTables",
     "shortName": "Equity and Regulatory Matters (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:EarningsPerShareTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1042 - Disclosure - Earnings Per Share (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareTables",
     "shortName": "Earnings Per Share (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:EarningsPerShareTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1043 - Disclosure - Stock Based Compensation (Tables)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationTables",
     "shortName": "Stock Based Compensation (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "bcow:ForeClosedAssetsPolicyTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "us-gaap:ForeclosedAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1044 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail",
     "shortName": "Summary of Significant Accounting Policies - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "bcow:ForeClosedAssetsPolicyTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "us-gaap:ForeclosedAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashFDICInsuredAmount",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1045 - Disclosure - Cash and Due from Banks - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail",
     "shortName": "Cash and Due from Banks - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "div",
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn03_12_2021_FederalReserveBankAdvancesMemberusgaapShortTermDebtTypeAxis",
      "decimals": "0",
      "lang": null,
      "name": "bcow:CashReserveRequirementPercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "us-gaap:OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P03_03_2020To03_03_2020_FederalFundsRateMemberusgaapDebtInstrumentAxis",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "us-gaap:DebtInstrumentInterestRateIncreaseDecrease",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1046 - Disclosure - Nature of Operations and Basis of Presentation - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
     "shortName": "Nature of Operations and Basis of Presentation - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "us-gaap:OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P03_03_2020To03_03_2020_FederalFundsRateMemberusgaapDebtInstrumentAxis",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "us-gaap:DebtInstrumentInterestRateIncreaseDecrease",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:MarketableSecuritiesTextBlock",
       "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1047 - Disclosure - Available for Sale Securities - Summary of Amortized Costs and Fair Value of Securities Available-for-sale (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
     "shortName": "Available for Sale Securities - Summary of Amortized Costs and Fair Value of Securities Available-for-sale (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:MarketableSecuritiesTextBlock",
       "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1048 - Disclosure - Available for Sale Securities - Summary of Amortized Costs and Fair Values of Securities Available-for-sale, by Contractual Maturity (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
     "shortName": "Available for Sale Securities - Summary of Amortized Costs and Fair Values of Securities Available-for-sale, by Contractual Maturity (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1049 - Disclosure - Available for Sale Securities - Summary of Gross Unrealized Losses on Securities Available-for-sale and Fair Values (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
     "shortName": "Available for Sale Securities - Summary of Gross Unrealized Losses on Securities Available-for-sale and Fair Values (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "bcow:CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
      "reportCount": 1,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1005 - Statement - Consolidated Statements of Operations (Parenthetical)",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperationsParenthetical",
     "shortName": "Consolidated Statements of Operations (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_DebtInstrument",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1050 - Disclosure - Available for Sale Securities - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesAdditionalInformationDetail",
     "shortName": "Available for Sale Securities - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_DebtInstrument",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1051 - Disclosure - Available for Sale Securities - Summary of Proceeds from Sales of Securities Available-for-sale, as well as Gross Gains and Losses (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfProceedsFromSalesOfSecuritiesAvailableForSaleAsWellAsGrossGainsAndLossesDetail",
     "shortName": "Available for Sale Securities - Summary of Proceeds from Sales of Securities Available-for-sale, as well as Gross Gains and Losses (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfRealizedGainLossTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesGrossRealizedGains",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1052 - Disclosure - Loans - Summary of Major Classifications of Loans (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail",
     "shortName": "Loans - Summary of Major Classifications of Loans (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1053 - Disclosure - Loans - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
     "shortName": "Loans - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableAllowance",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1054 - Disclosure - Loans - Summary of Activity in Allowance for Loan and Lease Losses (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
     "shortName": "Loans - Summary of Activity in Allowance for Loan and Lease Losses (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:ScheduleOfLoansClassIndividuallyAndCollectivelyEvaluatedForImpairmentTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancingReceivableIndividuallyEvaluatedForImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1055 - Disclosure - Loans - Summary of Allowance for Loan and Lease Losses for Loans Evaluated Individually and Collectively for Impairment (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail",
     "shortName": "Loans - Summary of Allowance for Loan and Lease Losses for Loans Evaluated Individually and Collectively for Impairment (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:ScheduleOfLoansClassIndividuallyAndCollectivelyEvaluatedForImpairmentTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancingReceivableIndividuallyEvaluatedForImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1056 - Disclosure - Loans - Summary of Internal Risk Ratings of Loans (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail",
     "shortName": "Loans - Summary of Internal Risk Ratings of Loans (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:SummaryOfInternalRiskRatingOfLoansTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021_InternalCreditRiskRatingMemberusgaapFinancialInstrumentPerformanceStatusAxis",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1057 - Disclosure - Loans - Summary of Information Regarding the Credit Quality Indicators for Residential Real Estate and Consumer Loans (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
     "shortName": "Loans - Summary of Information Regarding the Credit Quality Indicators for Residential Real Estate and Consumer Loans (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:FinancingReceivableCreditQualityIndicatorsTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021_CreditQualityMemberusgaapFinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1058 - Disclosure - Loans - Summary of Information Regarding Impaired Loans (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail",
     "shortName": "Loans - Summary of Information Regarding Impaired Loans (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:FinancingReceivableNonaccrualOtherThanTroubleDebtRestructurings",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1059 - Disclosure - Loans - Summary of Nonperforming Loans (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail",
     "shortName": "Loans - Summary of Nonperforming Loans (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:FinancingReceivableNonaccrualOtherThanTroubleDebtRestructurings",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1006 - Statement - Consolidated Statements of Comprehensive (Loss) Income",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome",
     "shortName": "Consolidated Statements of Comprehensive (Loss) Income",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:PastDueFinancingReceivablesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NotesReceivableGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1060 - Disclosure - Loans - Schedule of Analysis of Past due Loans (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
     "shortName": "Loans - Schedule of Analysis of Past due Loans (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:PastDueFinancingReceivablesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NotesReceivableGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:PropertyPlantAndEquipmentTextBlock",
       "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PropertyPlantAndEquipmentGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1061 - Disclosure - Premises and Equipment - Summary of Premises and Equipment (Details)",
     "role": "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails",
     "shortName": "Premises and Equipment - Summary of Premises and Equipment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:PropertyPlantAndEquipmentTextBlock",
       "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PropertyPlantAndEquipmentGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:Depreciation",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1062 - Disclosure - Premises and Equipment - Additional Information (Details)",
     "role": "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails",
     "shortName": "Premises and Equipment - Additional Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "bcow:UnpaidPrincipalBalanceOfLoansServicedForOthers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1063 - Disclosure - Mortgage Servicing Rights - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail",
     "shortName": "Mortgage Servicing Rights - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "bcow:UnpaidPrincipalBalanceOfLoansServicedForOthers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfServicingAssetsAtAmortizedValueTextBlock",
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ServicingAssetAtAmortizedValue",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1064 - Disclosure - Mortgage Servicing Rights - Summary of Activity in Mortgage Servicing Rights (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfActivityInMortgageServicingRightsDetail",
     "shortName": "Mortgage Servicing Rights - Summary of Activity in Mortgage Servicing Rights (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfServicingAssetsAtAmortizedValueTextBlock",
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:ServicingAssetAtAmortizedValueAdditions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock",
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1065 - Disclosure - Mortgage Servicing Rights - Summary of Estimated Future Amortization Expense for Mortgage Servicing Rights (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail",
     "shortName": "Mortgage Servicing Rights - Summary of Estimated Future Amortization Expense for Mortgage Servicing Rights (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock",
       "us-gaap:TransfersAndServicingOfFinancialAssetsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:DepositLiabilitiesTypeTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NoninterestBearingDepositLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1066 - Disclosure - Deposits - Composition of Deposits (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail",
     "shortName": "Deposits - Composition of Deposits (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:DepositLiabilitiesTypeTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NoninterestBearingDepositLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:DepositLiabilitiesTypeTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestBearingDomesticDepositBrokered",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1067 - Disclosure - Deposits - Composition of Deposits (Parenthetical) (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsParentheticalDetail",
     "shortName": "Deposits - Composition of Deposits (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:DepositLiabilitiesTypeTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestBearingDomesticDepositBrokered",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:ScheduleOfInterestExpenseOnDepositsTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestExpenseDomesticDepositLiabilitiesChecking",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1068 - Disclosure - Deposits - Interest Expense On Deposits (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DepositsInterestExpenseOnDepositsDetail",
     "shortName": "Deposits - Interest Expense On Deposits (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:ScheduleOfInterestExpenseOnDepositsTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestExpenseDomesticDepositLiabilitiesChecking",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:TimeDepositMaturitiesTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:TimeDepositMaturitiesYearOne",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1069 - Disclosure - Deposits - Scheduled Maturities of Certificates of Deposit (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail",
     "shortName": "Deposits - Scheduled Maturities of Certificates of Deposit (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:TimeDepositMaturitiesTableTextBlock",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:TimeDepositMaturitiesYearOne",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2019",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1007 - Statement - Consolidated Statements of Changes in Stockholders' Equity",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity",
     "shortName": "Consolidated Statements of Changes in Stockholders' Equity",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2019",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:TimeDepositsAtOrAboveFDICInsuranceLimit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1070 - Disclosure - Deposits - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DepositsAdditionalInformationDetail",
     "shortName": "Deposits - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:DepositLiabilitiesDisclosuresTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:TimeDepositsAtOrAboveFDICInsuranceLimit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AdvancesFromFederalHomeLoanBanks",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1071 - Disclosure -  FHLB Advances and Other Borrowings - Summary of Federal Home Loan Bank Advances (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail",
     "shortName": "FHLB Advances and Other Borrowings - Summary of Federal Home Loan Bank Advances (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020_FixedRateCovid19ReliefAdvanceMaturingMay2021MemberusgaapDebtInstrumentAxis",
      "decimals": "4",
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesInterestRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "4",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInNextTwelveRollingMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1072 - Disclosure - FHLB Advances and Other Borrowings - Schedule of Maturities of Federal Home Loan Bank Advances (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail",
     "shortName": "FHLB Advances and Other Borrowings - Schedule of Maturities of Federal Home Loan Bank Advances (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "4",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInNextTwelveRollingMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     }
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "bcow:DescriptionOfMaximumBorrowingCapacity",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1073 - Disclosure - FHLB Advances and Other Borrowings  - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail",
     "shortName": "FHLB Advances and Other Borrowings  - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "bcow:DescriptionOfMaximumBorrowingCapacity",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DefinedContributionPlanCostRecognized",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1074 - Disclosure - Employee Benefit Plans - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeBenefitPlansAdditionalInformationDetail",
     "shortName": "Employee Benefit Plans - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DefinedContributionPlanCostRecognized",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2020To12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CurrentFederalTaxExpenseBenefit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1075 - Disclosure - Income Taxes - Provision For Income taxes (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail",
     "shortName": "Income Taxes - Provision For Income taxes (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2020To12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CurrentFederalTaxExpenseBenefit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1076 - Disclosure - Income Taxes - Net Deferred Tax Asset and Liabilities (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail",
     "shortName": "Income Taxes - Net Deferred Tax Asset and Liabilities (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R77": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1077 - Disclosure - Income Taxes - Summary of the Sources of Differences Between Income Taxes At the Federal Statutory Rate and the Provision (Credit) for Income Taxes (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail",
     "shortName": "Income Taxes - Summary of the Sources of Differences Between Income Taxes At the Federal Statutory Rate and the Provision (Credit) for Income Taxes (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R78": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DeferredTaxAssetsValuationAllowance",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1078 - Disclosure - Income Taxes - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
     "shortName": "Income Taxes - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021_CharitableContributionCarryforwardMemberusgaapTaxCreditCarryforwardAxis",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:OperatingLossCarryforwards",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R79": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfFairValueOffBalanceSheetRisksTextBlock",
       "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021_CommitmentsToExtendCreditMemberusgaapFinancialInstrumentAxis",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1079 - Disclosure - Commitments and Contingencies - Summary of Contractual Amounts of Off-balance Sheet Credit Related Financial Instruments (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail",
     "shortName": "Commitments and Contingencies - Summary of Contractual Amounts of Off-balance Sheet Credit Related Financial Instruments (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfFairValueOffBalanceSheetRisksTextBlock",
       "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021_CommitmentsToExtendCreditMemberusgaapFinancialInstrumentAxis",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1008 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical",
     "shortName": "Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R80": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1080 - Disclosure - Commitments and Contingencies - Summary of Rent commitments Before Considering Renewal Options (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail",
     "shortName": "Commitments and Contingencies - Summary of Rent commitments Before Considering Renewal Options (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R81": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:OperatingLeaseRentExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1081 - Disclosure - Commitments and Contingencies - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail",
     "shortName": "Commitments and Contingencies - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:OperatingLeaseRentExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R82": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTextBlock",
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:SharesCommittedToBeReleased",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1082 - Disclosure - Employee Stock Ownership Plan - Employee Stock Ownership Plan (ESOP) Disclosures (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail",
     "shortName": "Employee Stock Ownership Plan - Employee Stock Ownership Plan (ESOP) Disclosures (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTextBlock",
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:SharesCommittedToBeReleased",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R83": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "bcow:CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
      "reportCount": 1,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1083 - Disclosure - Employee Stock Ownership Plan - Employee Stock Ownership Plan (ESOP) Disclosures (Parenthetical) (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresParentheticalDetail",
     "shortName": "Employee Stock Ownership Plan - Employee Stock Ownership Plan (ESOP) Disclosures (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R84": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_08_2019To01_08_2019",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeStockOwnershipPlanESOPSharesContributedToESOP",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1084 - Disclosure - Employee Stock Ownership Plan - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail",
     "shortName": "Employee Stock Ownership Plan - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_08_2019To01_08_2019",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeStockOwnershipPlanESOPSharesContributedToESOP",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R85": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfRelatedPartyTransactionsTableTextBlock",
       "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableRelatedParties",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1085 - Disclosure - Related Party Transactions - Summary of Loans to Directors, Executive Officers and Affiliates (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsSummaryOfLoansToDirectorsExecutiveOfficersAndAffiliatesDetail",
     "shortName": "Related Party Transactions - Summary of Loans to Directors, Executive Officers and Affiliates (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfRelatedPartyTransactionsTableTextBlock",
       "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2019",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableRelatedParties",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R86": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1086 - Disclosure - Related Party Transactions - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail",
     "shortName": "Related Party Transactions - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R87": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1087 - Disclosure - Fair Value - Summary of Assets Measured at Fair Value on a Recurring Basis (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
     "shortName": "Fair Value - Summary of Assets Measured at Fair Value on a Recurring Basis (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:AssetsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R88": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:FairValueDisclosureOfRateLockCommitments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1088 - Disclosure - Fair Value - Schedule of Quantitative Information about Nonrecurring Level 3 Fair Value Measurements (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
     "shortName": "Fair Value - Schedule of Quantitative Information about Nonrecurring Level 3 Fair Value Measurements (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "bcow:FairValueDisclosureOfRateLockCommitments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R89": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecurities",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1089 - Disclosure - Fair Value - Summary of Carrying Values and Estimated Fair Values of Financial Instruments (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail",
     "shortName": "Fair Value - Summary of Carrying Values and Estimated Fair Values of Financial Instruments (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021_FairValueInputsLevel1MemberusgaapFairValueByFairValueHierarchyLevelAxis",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProfitLoss",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1009 - Statement - Consolidated Statements of Cash flows",
     "role": "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows",
     "shortName": "Consolidated Statements of Cash flows",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProfitLoss",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R90": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "ix:continuation",
       "us-gaap:ImpairedFinancingReceivablesTableTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ImpairedFinancingReceivableRelatedAllowance",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1090 - Disclosure - Fair Value - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/FairValueAdditionalInformationDetail",
     "shortName": "Fair Value - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "bcow:ImpairmentLoanOnMortgageServicingRights",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R91": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonEquityTierOneCapital",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1091 - Disclosure - Equity and Regulatory Matters - Schedule of Banks Actual and Required Capital Amounts and Ratios (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail",
     "shortName": "Equity and Regulatory Matters - Schedule of Banks Actual and Required Capital Amounts and Ratios (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonEquityTierOneCapital",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R92": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "bcow:DisclosureOfDeferredCompensationTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DeferredCompensationLiabilityCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1092 - Disclosure - Deferred Compensation - Additional Information (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
     "shortName": "Deferred Compensation - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "bcow:DisclosureOfDeferredCompensationTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DeferredCompensationLiabilityCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     }
    },
    "R93": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "Unit_USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1093 - Disclosure - Earnings Per Share - Earnings Per Common Share (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail",
     "shortName": "Earnings Per Share - Earnings Per Common Share (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "us-gaap:EarningsPerShareTextBlock",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:WeightedAverageNumberOfSharesIssuedBasic",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R94": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "bcow:CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
      "reportCount": 1,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1094 - Disclosure - Earnings Per Share - Earnings Per Common Share (Parenthetical) (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareParentheticalDetail",
     "shortName": "Earnings Per Share - Earnings Per Common Share (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R95": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "4",
      "first": true,
      "lang": null,
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1095 - Disclosure - Stock Based Compensation - Summary of Assumptions Used in Estimating the Fair Value of Options Granted (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInEstimatingTheFairValueOfOptionsGrantedDetail",
     "shortName": "Stock Based Compensation - Summary of Assumptions Used in Estimating the Fair Value of Options Granted (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "P01_01_2021To12_31_2021",
      "decimals": "4",
      "first": true,
      "lang": null,
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     }
    },
    "R96": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
      "reportCount": 1,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1096 - Disclosure - Stock Based Compensation - Summary of Stock Option Activity (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail",
     "shortName": "Stock Based Compensation - Summary of Stock Option Activity (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2019",
      "decimals": null,
      "lang": null,
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "true"
     }
    },
    "R97": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "bcow:CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
      "reportCount": 1,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1097 - Disclosure - Stock Based Compensation - Summary of Stock Option Activity (Parenthetical) (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail",
     "shortName": "Stock Based Compensation - Summary of Stock Option Activity (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R98": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2020",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares",
      "reportCount": 1,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1098 - Disclosure - Stock Based Compensation - Summary of Nonvested Stock option Activity (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail",
     "shortName": "Stock Based Compensation - Summary of Nonvested Stock option Activity (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "table",
       "bcow:ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2019",
      "decimals": "INF",
      "lang": null,
      "name": "us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_shares",
      "xsiNil": "false"
     }
    },
    "R99": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "td",
       "tr",
       "table",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "d621362d10k.htm",
      "contextRef": "PAsOn12_31_2021",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "bcow:CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
      "reportCount": 1,
      "unitRef": "Unit_pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "1099 - Disclosure - Stock Based Compensation - Summary of Nonvested Stock option Activity (Parenthetical) (Detail)",
     "role": "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
     "shortName": "Stock Based Compensation - Summary of Nonvested Stock option Activity (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    }
   },
   "segmentCount": 115,
   "tag": {
    "bcow_AccruedInterestPayable": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Accrued interest payable.",
        "label": "Accrued Interest Payable",
        "terseLabel": "Accrued interest payable"
       }
      }
     },
     "localname": "AccruedInterestPayable",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_AccruingLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Accruing Loans [Member]",
        "label": "Accruing Loans [Member]",
        "verboseLabel": "Accruing Loans [Member]"
       }
      }
     },
     "localname": "AccruingLoansMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_AdditionalCommittedImpairedLoans": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Additional committed impaired loans.",
        "label": "Additional committed impaired loans",
        "terseLabel": "Additional committed impared loans"
       }
      }
     },
     "localname": "AdditionalCommittedImpairedLoans",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_AdjustmentToMortgageServicingRightsValuation": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 38.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Adjustment to mortgage servicing rights valuation.",
        "label": "Adjustment To Mortgage Servicing Rights Valuation",
        "terseLabel": "Adjustment to mortgage servicing rights valuation"
       }
      }
     },
     "localname": "AdjustmentToMortgageServicingRightsValuation",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_AdvanceStructuredNotePaymentsDueMonthlyMaturingApril2030Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Advance structured note, payments due monthly, maturing April 2030.",
        "label": "Advance Structured Note Payments Due Monthly Maturing April 2030 [Member]",
        "verboseLabel": "Advance structured note, payments due monthly, maturing April 2030 [Member]"
       }
      }
     },
     "localname": "AdvanceStructuredNotePaymentsDueMonthlyMaturingApril2030Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_AdvanceStructuredNotePaymentsDueMonthlyMaturingFeb2030Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Advance structured note, payments due monthly, maturing Feb 2030.",
        "label": "Advance Structured Note Payments Due Monthly Maturing Feb 2030 [Member]",
        "verboseLabel": "Advance structured note, payments due monthly, maturing February 2030 [Member]"
       }
      }
     },
     "localname": "AdvanceStructuredNotePaymentsDueMonthlyMaturingFeb2030Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_AdvanceStructuredNotePaymentsDueMonthlyMaturingMay2030Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Advance structured note payments due monthly maturing may 2030 [Member].",
        "label": "Advance Structured Note Payments Due Monthly Maturing May 2030 [Member]",
        "verboseLabel": "Advance structured note, payments due monthly, maturing May 2030 [Member]"
       }
      }
     },
     "localname": "AdvanceStructuredNotePaymentsDueMonthlyMaturingMay2030Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_AnnualGrossRevenueBenchmarkToQualifyAsEmergingGrowthCompany": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Annual gross revenue benchmark to qualify as emerging growth company.",
        "label": "Annual Gross Revenue Benchmark To Qualify As Emerging Growth Company",
        "terseLabel": "Annual gross revenue benchmark to qualify as emerging growth company"
       }
      }
     },
     "localname": "AnnualGrossRevenueBenchmarkToQualifyAsEmergingGrowthCompany",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_BmoHarrisBankMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "BMO harris bank.",
        "label": "BMO Harris Bank [Member]"
       }
      }
     },
     "localname": "BmoHarrisBankMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_CashReceivedInMhcMerger": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 15.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Cash received in MHC merger.",
        "label": "Cash Received In MHC Merger",
        "negatedLabel": "Cash Received In MHC Merger"
       }
      }
     },
     "localname": "CashReceivedInMhcMerger",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_CashReserveRequirementPercentage": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Cash Reserve Requirement Percentage",
        "label": "Cash Reserve Requirement Percentage",
        "terseLabel": "Cash Reserve Requirement Percentage"
       }
      }
     },
     "localname": "CashReserveRequirementPercentage",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_CharitableContributionCarryforwardMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Charitable contribution carryforward [Member]",
        "terseLabel": "Charitable contribution carryforward [Member]"
       }
      }
     },
     "localname": "CharitableContributionCarryforwardMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_CommercialLandDevelopmentMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Commercial Land development [Member]",
        "terseLabel": "Commercial Land Development [Member]"
       }
      }
     },
     "localname": "CommercialLandDevelopmentMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_CommercialOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Commercial other.",
        "label": "Commercial Other [Member]",
        "terseLabel": "Commercial Other [Member]"
       }
      }
     },
     "localname": "CommercialOtherMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_CommonEquityTierOneCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Common Equity Tier One Capital Required To Be Well Capitalized To Risk Weighted Assets",
        "label": "Common Equity Tier One Capital Required To Be Well Capitalized To Risk Weighted Assets",
        "terseLabel": "Leverage tier 1 capital to be well capitalized under prompt corrective action provisions ratio"
       }
      }
     },
     "localname": "CommonEquityTierOneCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Common Equity Tier One Risk Based Capital Required For Capital Adequacy",
        "label": "Common Equity Tier One Risk Based Capital Required For Capital Adequacy",
        "terseLabel": "Leverage tier 1 capital for capital adequacy purposes amount"
       }
      }
     },
     "localname": "CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_CommonStockHeldByPublic": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Common stock held by public.",
        "label": "Common Stock Held By Public",
        "terseLabel": "Common Stock Held By Public"
       }
      }
     },
     "localname": "CommonStockHeldByPublic",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_CommonStockHeldReclassifiedToTreasuryStock": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Common stock held reclassified to treasury stock.",
        "label": "Common Stock Held Reclassified To Treasury Stock",
        "terseLabel": "1895 Bancorp of Wisconsin, Inc. common stock held by PyraMax Bank reclassified to treasury stock"
       }
      }
     },
     "localname": "CommonStockHeldReclassifiedToTreasuryStock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_CommonStockReclassifiedToTreasuryStock": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "common stock reclassified to treasury stock.",
        "label": "Common Stock Reclassified To Treasury Stock",
        "verboseLabel": "Common stock reclassified to treasury stock"
       }
      }
     },
     "localname": "CommonStockReclassifiedToTreasuryStock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "definitionGuidance": "Common Stock Shares Conversion Ratio As Part Of Offering Pursuant To Share Based Scheme",
        "documentation": "Common stock shares conversion ratio as part of offering pursuant to share based scheme.",
        "label": "Common Stock Shares Conversion Ratio As Part Of Offering Pursuant To Share Based Scheme",
        "terseLabel": "Common stock shares conversion ratio as part of offering pursuant to share based scheme",
        "verboseLabel": "Common stock shares conversion ratio as part of offering pursuant to share based scheme"
       }
      }
     },
     "localname": "CommonStockSharesConversionRatioAsPartOfOfferingPursuantToShareBasedScheme",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperationsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "bcow_CommonTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The minimum Common Tier One Capital Ratio (Common Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.",
        "label": "Common Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets",
        "terseLabel": "Leverage tier 1 capital for capital adequacy purposes ratio"
       }
      }
     },
     "localname": "CommonTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_ConsumerAndOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Consumer other.",
        "label": "Consumer And Other [Member]",
        "terseLabel": "Consumer Other [Member]"
       }
      }
     },
     "localname": "ConsumerAndOtherMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ConsumerHomeEquityAndLinesOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Consumer home equity and lines of credit.",
        "label": "Consumer Home equity and lines of credit [Member]",
        "terseLabel": "Consumer Home Equity and Lines of Credit [Member]"
       }
      }
     },
     "localname": "ConsumerHomeEquityAndLinesOfCreditMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ConsumerOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Consumer Other [Member]",
        "label": "Consumer Other [Member]",
        "terseLabel": "Consumer Other [Member]"
       }
      }
     },
     "localname": "ConsumerOtherMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ContributionFrom1895BancorpOfWisconsinMhc": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Contribution from 1895 bancorp of wisconsin, MHC.",
        "label": "Contribution from 1895 Bancorp of Wisconsin, MHC"
       }
      }
     },
     "localname": "ContributionFrom1895BancorpOfWisconsinMhc",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_CovidNineteenMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Covid nineteen [Member].",
        "label": "Covid Nineteen [Member]",
        "terseLabel": "Covid Nineteen [Member]"
       }
      }
     },
     "localname": "CovidNineteenMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_CreditEnhancementUnderFHLBOfChicagoMortgagePartnershipFinanceProgramMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Credit enhancement under FHLB of chicago mortgage partnership finance program.",
        "label": "Credit enhancement under F- H- L- B- of Chicago Mortgage Partnership Finance Program [Member]",
        "terseLabel": "Credit Enhancement Under FHLB of Chicago Mortgage Partnership Finance Program [Member]"
       }
      }
     },
     "localname": "CreditEnhancementUnderFHLBOfChicagoMortgagePartnershipFinanceProgramMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_CreditQualityMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Credit quality.",
        "label": "Credit Quality [Member]",
        "terseLabel": "Credit Quality [Member]"
       }
      }
     },
     "localname": "CreditQualityMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_DeferredCompensationOutstandingLiability": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of value of Deferred Compensation Outstanding Liability.",
        "label": "Deferred Compensation Outstanding Liability",
        "verboseLabel": "Liability outstanding"
       }
      }
     },
     "localname": "DeferredCompensationOutstandingLiability",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_DeferredCompensationPlanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Deferred compensation plan(member).",
        "label": "Deferred Compensation Plan [Member]"
       }
      }
     },
     "localname": "DeferredCompensationPlanMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_DeferredTaxAssetsNolAndCharitableContributionCarryforwards": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 7.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Deferred Tax Assets NOL And Charitable Contribution Carryforwards.",
        "label": "Deferred Tax Assets NOL And Charitable Contribution Carryforwards",
        "terseLabel": "NOL and charitable contribution carryforwards"
       }
      }
     },
     "localname": "DeferredTaxAssetsNolAndCharitableContributionCarryforwards",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsReleaseOfShares": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 6.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Deferred Tax Assets Tax Deferred Expense Compensation And Benefits release of shares.",
        "label": "Deferred Tax Assets Tax Deferred Expense Compensation And Benefits release of shares",
        "terseLabel": "ESOP release of shares"
       }
      }
     },
     "localname": "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsReleaseOfShares",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_DeferredTaxLiabilitiesFHLBStockDividends": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from FHLB stock dividends.",
        "label": "Deferred Tax Liabilities FHLB stock dividends",
        "verboseLabel": "FHLB stock dividends"
       }
      }
     },
     "localname": "DeferredTaxLiabilitiesFHLBStockDividends",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_DeferredTaxLiabilitiesLoanFees": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from loan fees.",
        "label": "Deferred Tax Liabilities Loan Fees",
        "verboseLabel": "Loan fees"
       }
      }
     },
     "localname": "DeferredTaxLiabilitiesLoanFees",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_DescriptionOfMaximumBorrowingCapacity": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Description of maximum borrowing capacity.",
        "label": "Description of Maximum Borrowing Capacity",
        "terseLabel": "Federal Home Loan Bank stock to maximum borrowing capacity"
       }
      }
     },
     "localname": "DescriptionOfMaximumBorrowingCapacity",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "bcow_DirectorsExecutiveOfficersAndAffiliatesMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Directors, executive officers and affiliates.",
        "label": "Directors, Executive Officers And Affiliates [Member]",
        "terseLabel": "Directors, Executive Officers and Affiliates [Member]"
       }
      }
     },
     "localname": "DirectorsExecutiveOfficersAndAffiliatesMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_DisclosureOfDeferredCompensationTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "xxx_Disclosure Of Deferred Compensation [Text Block]",
        "label": "Disclosure Of Deferred Compensation"
       }
      }
     },
     "localname": "DisclosureOfDeferredCompensationTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_EffectiveIncomeTaxRateReconciliationCashValueOfLifeInsurancePercent": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 6.0,
       "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations",
       "weight": 1.0
      }
     },
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to cash value of life insurance.",
        "label": "Effective Income Tax Rate Reconciliation Cash Value Of Life Insurance Percent",
        "verboseLabel": "Increase in cash value of life insurance, Percentage"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateReconciliationCashValueOfLifeInsurancePercent",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_EmployeeStockOwnershipPlanEsopNumberOfUnallocatedShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents number of shares for which compensation cost not allocated.",
        "label": "Employee Stock Ownership Plan ESOP Number of Unallocated Shares",
        "terseLabel": "Total unallocated shares",
        "verboseLabel": "Unallocated common stock of Employee Stock Ownership Plan"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanEsopNumberOfUnallocatedShares",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "bcow_EmployeeStockOwnershipPlanEsopUnallocatedCompensation": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 12.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents unallocated ESOP plan expense.",
        "label": "Employee Stock Ownership Plan ESOP Unallocated Compensation",
        "negatedLabel": "Unallocated common stock of Employee Stock Ownership Plan (ESOP), 377,077 and 161,486 shares at December 31, 2021 and December 31, 2020, respectively"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanEsopUnallocatedCompensation",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_EmployeeStockOwnershipPlanValueCommittedToBeReleased": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Employee Stock Ownership Plan Value Committed To be Released.",
        "label": "Employee Stock Ownership Plan Value Committed To be Released",
        "verboseLabel": "ESOP shares committed to be released (7,021 shares)"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanValueCommittedToBeReleased",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_FairValueDisclosureOfMortgageServicingRights": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "fair value disclosure of Mortgage servicing rights",
        "label": "fair value disclosure of Mortgage servicing rights",
        "terseLabel": "Mortgage servicing rights"
       }
      }
     },
     "localname": "FairValueDisclosureOfMortgageServicingRights",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_FairValueDisclosureOfRateLockCommitments": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value disclosure of Rate lock commitments",
        "label": "Fair value disclosure of Rate lock commitments",
        "terseLabel": "Rate lock commitments"
       }
      }
     },
     "localname": "FairValueDisclosureOfRateLockCommitments",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_FairValueOfUnallocatedSharesOfEsopSharePrice": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Fair Value of Unallocated Shares Of ESOP Share Price.",
        "label": "Fair Value of Unallocated Shares Of ESOP Share Price",
        "terseLabel": "Fair Value of Unallocated Shares Of ESOP Share Price"
       }
      }
     },
     "localname": "FairValueOfUnallocatedSharesOfEsopSharePrice",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "bcow_FederalFundRateMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Federal Fund Rate [Member]",
        "terseLabel": "Federal Fund Rate [Member]"
       }
      }
     },
     "localname": "FederalFundRateMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FederalFundsRateMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Federal Funds Rate [Member]",
        "terseLabel": "Federal funds rate [Member]"
       }
      }
     },
     "localname": "FederalFundsRateMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FederalHomeLoanBankAdvancesPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for federal home loan bank loan stock.",
        "label": "Federal Home Loan Bank Advances Policy [Policy Text Block]",
        "verboseLabel": "Federal Home Loan Bank Stock"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesPolicyPolicyTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_FinancingReceivableDeferralAmount": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Financing receivable, deferral amount.",
        "label": "Financing Receivable Deferral Amount",
        "terseLabel": "Financing receivable deferral amount"
       }
      }
     },
     "localname": "FinancingReceivableDeferralAmount",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_FinancingReceivableInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Financing Receivable, Interest Rate",
        "label": "Financing Receivable Interest Rate",
        "terseLabel": "Financing Receivable, Interest Rate"
       }
      }
     },
     "localname": "FinancingReceivableInterestRate",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_FinancingReceivableNonaccrualOtherThanTroubleDebtRestructurings": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of financing receivable on nonaccrual status other than troubled debt restructurings",
        "label": "Financing Receivable Nonaccrual other than Trouble debt restructurings",
        "verboseLabel": "Nonaccrual loans, other than troubled debt restructurings"
       }
      }
     },
     "localname": "FinancingReceivableNonaccrualOtherThanTroubleDebtRestructurings",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_FinancingReceivableNumberOfContracts": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Financing Receivable, Number Of Contracts",
        "label": "Financing Receivable Number Of Contracts",
        "terseLabel": "Financing Receivable, Number Of Contracts"
       }
      }
     },
     "localname": "FinancingReceivableNumberOfContracts",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "integerItemType"
    },
    "bcow_FinancingReceivables30To89DaysPastDueMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "30 to 89 days past due.",
        "label": "Financing Receivables 30 To 89 Days Past Due [Member]",
        "terseLabel": "Loans Past Due 30-89 Days [Member]"
       }
      }
     },
     "localname": "FinancingReceivables30To89DaysPastDueMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FixedRateCovid19ReliefAdvanceMaturingMay2021Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fixed rate, COVID-19 Relief Advance, maturing May 2021.",
        "label": "Fixed rate COVID19 Relief Advance maturing May 2021 [Member]",
        "terseLabel": "Fixed rate, COVID-19 Relief Advance, maturing May 2021 [Member]"
       }
      }
     },
     "localname": "FixedRateCovid19ReliefAdvanceMaturingMay2021Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FixedRateFixedTermAdvanceMaturingFebruary2022Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fixed rate, fixed term advance, maturing February 2022.",
        "label": "Fixed Rate Fixed Term Advance Maturing February 2022 [Member]",
        "terseLabel": "Fixed rate, fixed term advance, maturing February 2022 [Member]"
       }
      }
     },
     "localname": "FixedRateFixedTermAdvanceMaturingFebruary2022Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FixedRateFixedTermAdvanceMaturingFebruary2023Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fixed rate, fixed term advance, maturing February 2023.",
        "label": "Fixed Rate Fixed Term Advance Maturing February 2023 [Member]",
        "terseLabel": "Fixed rate, fixed term advance, maturing February 2023 [Member]"
       }
      }
     },
     "localname": "FixedRateFixedTermAdvanceMaturingFebruary2023Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FixedRateFixedTermAdvanceMaturingJuly2021Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fixed rate, fixed term advance, maturing July 2021.",
        "label": "Fixed Rate Fixed Term Advance Maturing July 2021 [Member]",
        "terseLabel": "Fixed rate, fixed term advance, maturing July 2021 [Member]"
       }
      }
     },
     "localname": "FixedRateFixedTermAdvanceMaturingJuly2021Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_FixedRateMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fixed rate.",
        "label": "Fixed Rate [Member]",
        "terseLabel": "Fixed Rate [Member]"
       }
      }
     },
     "localname": "FixedRateMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ForeClosedAssetsPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for foreclosed assets.",
        "label": "Fore closed Assets [Policy Text Block]",
        "verboseLabel": "Foreclosed Assets"
       }
      }
     },
     "localname": "ForeClosedAssetsPolicyTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_ForeclosedAssetsOperatingExpenses": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 28.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Foreclosed assets, operating expenses.",
        "label": "Foreclosed Assets Operating Expenses",
        "terseLabel": "Foreclosed assets, net"
       }
      }
     },
     "localname": "ForeclosedAssetsOperatingExpenses",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_FurnitureAndEquipmentMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Furniture and Equipment [Member]"
       }
      }
     },
     "localname": "FurnitureAndEquipmentMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_GovernmentSponsoredMortgageBackedSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Government sponsored mortgage backed securities.",
        "label": "Government Sponsored Mortgage Backed Securities [Member]",
        "terseLabel": "Government-sponsored Mortgage-backed Securities [Member]"
       }
      }
     },
     "localname": "GovernmentSponsoredMortgageBackedSecuritiesMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_HomeEquityLinesOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Home Equity Lines Of Credit [Member]",
        "label": "Home Equity Lines Of Credit [Member]"
       }
      }
     },
     "localname": "HomeEquityLinesOfCreditMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ImpairmentLoanOnMortgageServicingRights": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "impairment Loan on mortgage servicing rights",
        "label": "impairment Loan on mortgage servicing rights",
        "terseLabel": "impairment Loan on mortgage servicing rights"
       }
      }
     },
     "localname": "ImpairmentLoanOnMortgageServicingRights",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_IncomeTaxReconciliationCashValueOfLifeInsurance": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the cash value of life insurance.",
        "label": "Income Tax Reconciliation Cash Value Of Life Insurance",
        "verboseLabel": "Increase in cash value of life insurance, Amount"
       }
      }
     },
     "localname": "IncomeTaxReconciliationCashValueOfLifeInsurance",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 29.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Increase (decrease) in accrued interest payable and other liabilities.",
        "label": "Increase (Decrease) in Accrued Interest Payable and Other Liabilities",
        "terseLabel": "Change in accrued interest payable and other liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedInterestPayableAndOtherLiabilities",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 28.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Increase (decrease) in accrued interest receivable and other assets.",
        "label": "Increase (Decrease) in Accrued Interest Receivable And Other Assets",
        "negatedLabel": "Change in accrued interest receivable and other assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_IncreaseDecreaseInMortgageServicingRights": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 27.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Increase (decrease) in mortgage servicing rights.",
        "label": "Increase Decrease In Mortgage Servicing Rights",
        "negatedLabel": "Net change in mortgage servicing rights"
       }
      }
     },
     "localname": "IncreaseDecreaseInMortgageServicingRights",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_IncreaseInCashSurrenderValueOfLifeInsurance": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 18.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Increase in cash surrender value of life insurance.",
        "label": "Increase In Cash Surrender Value Of Life Insurance",
        "terseLabel": "Increase in cash surrender value of insurance"
       }
      }
     },
     "localname": "IncreaseInCashSurrenderValueOfLifeInsurance",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_InternalCreditRiskRatingMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Internal Credit Risk Rating [Member]",
        "label": "Internal Credit Risk Rating [Member]",
        "terseLabel": "Internal Credit Risk Rating [Member]"
       }
      }
     },
     "localname": "InternalCreditRiskRatingMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_IssuanceOfTreasuryStockStockCompensationPlan": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Issuance of treasury stock- stock compensation plan.",
        "label": "Issuance Of Treasury Stock Stock Compensation Plan",
        "terseLabel": "Issuance of treasury stock \u2013 stock compensation plans"
       }
      }
     },
     "localname": "IssuanceOfTreasuryStockStockCompensationPlan",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_LeaseholdAndLandImprovementsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Leasehold and Land Improvements [Member]",
        "terseLabel": "Leasehold Improvements [Member]"
       }
      }
     },
     "localname": "LeaseholdAndLandImprovementsMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_LineOfCreditAtFederalReserve": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line Of Credit At Federal Reserve",
        "label": "Line Of Credit At Federal Reserve"
       }
      }
     },
     "localname": "LineOfCreditAtFederalReserve",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_LoanServicing": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 15.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan servicing.",
        "label": "Loan Servicing",
        "terseLabel": "Loan servicing, net"
       }
      }
     },
     "localname": "LoanServicing",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllAssets": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans and leases receivable, ratio of nonperforming loans to all assets.",
        "label": "Loans and Leases Receivable, Ratio of Nonperforming Loans to All Assets",
        "verboseLabel": "Total non-accrual loans to total assets"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableRatioOfNonperformingLoansToAllAssets",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_LoansAndLeasesReceivablesLoansInForgivenAmount": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans and leases receivables loans in forgiven amount.",
        "label": "Loans And Leases Receivables Loans In Forgiven Amount",
        "terseLabel": "Loans Forgiven Amount"
       }
      }
     },
     "localname": "LoansAndLeasesReceivablesLoansInForgivenAmount",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_LoansNotesAndCertificatesAndLoanServicingRightsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]",
        "label": "Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]",
        "terseLabel": "Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]"
       }
      }
     },
     "localname": "LoansNotesAndCertificatesAndLoanServicingRightsLineItems",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "bcow_LoansPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans.",
        "label": "Loans [Policy Text Block]",
        "terseLabel": "Loans"
       }
      }
     },
     "localname": "LoansPolicyTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_MaximumLoanBorrowed": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Maximum loan borrowed.",
        "label": "Maximum Loan Borrowed",
        "terseLabel": "Maximum Loan Borrowed"
       }
      }
     },
     "localname": "MaximumLoanBorrowed",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_MortgagePartnershipFinanceProgramMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Mortgage partnership finance program.",
        "label": "Mortgage Partnership Finance Program [Member]",
        "terseLabel": "Mortgage Partnership Finance Program [Member]"
       }
      }
     },
     "localname": "MortgagePartnershipFinanceProgramMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_MortgageServicingRightsNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 23.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Mortgage servicing rights, net.",
        "label": "Mortgage Servicing Rights Net",
        "terseLabel": "Mortgage servicing rights, net"
       }
      }
     },
     "localname": "MortgageServicingRightsNet",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_NatureOfOperationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Nature Of Operations [Abstract]",
        "label": "Nature Of Operations [Abstract]"
       }
      }
     },
     "localname": "NatureOfOperationsAbstract",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "xbrltype": "stringItemType"
    },
    "bcow_NetAmortizationFromInvestmentSecurities": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 31.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Net amortization from investment securities.",
        "label": "Net Amortization From Investment Securities",
        "verboseLabel": "Net amortization of investment securities"
       }
      }
     },
     "localname": "NetAmortizationFromInvestmentSecurities",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_NetChangeInMarketableEquitySecurities": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 18.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Net change in marketable equity securities.",
        "label": "Net Change In Marketable Equity Securities",
        "negatedLabel": "Net Change In Marketable Equity Securities"
       }
      }
     },
     "localname": "NetChangeInMarketableEquitySecurities",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_NonAccruingLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Non Accruing Loan [Member]",
        "label": "Non Accruing Loan [Member]"
       }
      }
     },
     "localname": "NonAccruingLoanMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_NumberOfSharesToBeContributedToTheEmployeeStockOwnershipPlan": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number Of Shares To Be Contributed To The Employee Stock Ownership Plan.",
        "label": "Number Of Shares To Be Contributed To The Employee Stock Ownership Plan",
        "terseLabel": "Number of shares to be contributed to the employee stock owership plan"
       }
      }
     },
     "localname": "NumberOfSharesToBeContributedToTheEmployeeStockOwnershipPlan",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "bcow_ObligationsOfStatesAndPoliticalSubdivisionsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Obligations of states and political subdivisions.",
        "label": "Obligations of States and Political Subdivisions [Member]",
        "terseLabel": "Obligations of states and political subdivisions [Member]"
       }
      }
     },
     "localname": "ObligationsOfStatesAndPoliticalSubdivisionsMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_OperatingLeaseRentExpense": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Operating Lease Rent Expense.",
        "label": "Operating Lease Rent Expense",
        "terseLabel": "Opearating Lease, Rent Expenses"
       }
      }
     },
     "localname": "OperatingLeaseRentExpense",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_OperatingLossCarryforwardsExpirationPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Expiration period of each operating loss carryforward included in operating loss carryforward.",
        "label": "Operating Loss Carryforwards Expiration Period",
        "verboseLabel": "Expiration Period"
       }
      }
     },
     "localname": "OperatingLossCarryforwardsExpirationPeriod",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "bcow_OperatingLossCarryforwardsNotSubjectToExpiration": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Operating Loss Carryforwards, Not Subject to Expiration",
        "label": "Operating Loss Carryforwards Not Subject to Expiration",
        "terseLabel": "Operating Loss Carryforwards, Not Subject to Expiration"
       }
      }
     },
     "localname": "OperatingLossCarryforwardsNotSubjectToExpiration",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_OperatingLossCarryforwardsSubjectToExpiration": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Operating Loss Carryforwards, Subject to Expiration",
        "label": "Operating Loss Carryforwards Subject to Expiration",
        "terseLabel": "Operating Loss Carryforwards, Subject to Expiration"
       }
      }
     },
     "localname": "OperatingLossCarryforwardsSubjectToExpiration",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_OtherCommercialLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Other Commercial Loan [Member]",
        "label": "Other Commercial Loan [Member]",
        "terseLabel": "Other Commercial Loan [Member]"
       }
      }
     },
     "localname": "OtherCommercialLoanMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_OtherConsumerLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Other Consumer Loan [Member]",
        "label": "Other Consumer Loan [Member]",
        "terseLabel": "Other Consumer Loan [Member]"
       }
      }
     },
     "localname": "OtherConsumerLoanMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_OtherFinancialInstitutionsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Other Financial Institutions [Member]",
        "label": "Other Financial Institutions [Member]",
        "terseLabel": "Other Financial Institutions [Member]"
       }
      }
     },
     "localname": "OtherFinancialInstitutionsMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_OverdraftProtectionProgramCommitmentsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Overdraft protection program commitments.",
        "label": "Overdraft Protection Program Commitments [Member]",
        "terseLabel": "Overdraft Protection Program Commitments [Member]"
       }
      }
     },
     "localname": "OverdraftProtectionProgramCommitmentsMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ParticipationLoansTransferred": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Participation loans transferred.",
        "label": "Participation loans transferred",
        "terseLabel": "Participation loans transferred"
       }
      }
     },
     "localname": "ParticipationLoansTransferred",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_PaymentsForProceedsFromAcquirePropertyPlantAndEquipment": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 14.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Payments for proceeds from acquire property plant and equipment.",
        "label": "Payments For Proceeds From Acquire Property Plant And Equipment",
        "terseLabel": "Net capital expenditures for premises and equipment"
       }
      }
     },
     "localname": "PaymentsForProceedsFromAcquirePropertyPlantAndEquipment",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_PaymentsToRepurchaseSharesUnderEmployeeStockOwnershipPlan": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Payments to Repurchase Shares Under Employee Stock Ownership Plan.",
        "label": "Payments to Repurchase Shares Under Employee Stock Ownership Plan",
        "negatedLabel": "Purchase of ESOP shares"
       }
      }
     },
     "localname": "PaymentsToRepurchaseSharesUnderEmployeeStockOwnershipPlan",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_PercentageOfLoanGuaranteeBySmallBusinessAdministration": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage Of Loan Guarantee By Small Business Administration",
        "label": "Percentage Of Loan Guarantee By Small Business Administration",
        "terseLabel": "Percentage Of Loan Guarantee By Small Business Administration"
       }
      }
     },
     "localname": "PercentageOfLoanGuaranteeBySmallBusinessAdministration",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_PercentageOfLossInGrossReceipts": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of loss in gross receipts.",
        "label": "Percentage Of Loss In Gross Receipts",
        "terseLabel": "Percentage Of Loss In Gross Receipts"
       }
      }
     },
     "localname": "PercentageOfLossInGrossReceipts",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "bcow_PeriodForCompanyQualifiesAsEmergingGrowthCompanyFromCompletionOfStockOffering": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Period for company qualifies as emerging growth company from completion of stock offering.",
        "label": "Period For Company Qualifies As Emerging Growth Company From Completion Of Stock Offering",
        "verboseLabel": "Period for company qualifies as emerging growth company from completion of stock offering"
       }
      }
     },
     "localname": "PeriodForCompanyQualifiesAsEmergingGrowthCompanyFromCompletionOfStockOffering",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "bcow_PppLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "PPP loans [Member]"
       }
      }
     },
     "localname": "PppLoansMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_PresidentAndChiefOperatingOfficerMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "President and Chief Operating Officer [Member].",
        "label": "President And Chief Operating Officer [Member]",
        "terseLabel": "President and Chief Operating Officer [Member]"
       }
      }
     },
     "localname": "PresidentAndChiefOperatingOfficerMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ProvisionCreditForLoanLosses": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 37.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Provision (credit) for loan losses.",
        "label": "Provision Credit For Loan Losses",
        "terseLabel": "Provision for loan losses"
       }
      }
     },
     "localname": "ProvisionCreditForLoanLosses",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_PutableAdvanceMaturingFeb2030FirstPutOptionDateFeb2023Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Putable advance, maturing Feb 2030 first put option date Feb 2023.",
        "label": "Putable Advance Maturing Feb 2030 First Put Option Date Feb 2023 [Member]",
        "verboseLabel": "Putable advance, maturing February 2030 first option date Feb 2023 [Member]"
       }
      }
     },
     "localname": "PutableAdvanceMaturingFeb2030FirstPutOptionDateFeb2023Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_PutableAdvanceMaturingMar2030FirstPutOptionDateMar2025Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Putable advance, maturing Mar 2030 first put option date Mar 2025.",
        "label": "Putable Advance Maturing Mar 2030 First Put Option Date Mar 2025 [Member]",
        "verboseLabel": "Putable advance, maturing March 2030 first option date March 2025 [Member]"
       }
      }
     },
     "localname": "PutableAdvanceMaturingMar2030FirstPutOptionDateMar2025Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_PutableAdvanceMaturingOct2029FirstPutOptionDateNov2020Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Putable advance, maturing Oct 2029 first put option date Nov 2020.",
        "label": "Putable Advance Maturing Oct 2029 First Put Option Date Nov 2020 [Member]",
        "verboseLabel": "Putable advance, maturing October 2029 first option date Nov 2020 [Member]"
       }
      }
     },
     "localname": "PutableAdvanceMaturingOct2029FirstPutOptionDateNov2020Member",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_RateLockCommitments": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Rate lock commitments",
        "label": "Rate lock commitments",
        "terseLabel": "Rate lock commitments"
       }
      }
     },
     "localname": "RateLockCommitments",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_ReorganizationCostAndIssuingOfCommonStockDeferred": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reorganization Cost And Issuing Of Common Stock Deferred.",
        "label": "Reorganization Cost And Issuing Of Common Stock Deferred",
        "terseLabel": "Reorganization Cost And Issuing Of Common Stock Deferred"
       }
      }
     },
     "localname": "ReorganizationCostAndIssuingOfCommonStockDeferred",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_ResidentialConstructionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Residential Construction [Member]",
        "label": "Residential Construction [Member]",
        "terseLabel": "Residential Construction [Member]"
       }
      }
     },
     "localname": "ResidentialConstructionMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ResidentialFirstMortgagesMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Residential First Mortgages [Member]",
        "label": "Residential First Mortgages [Member]",
        "terseLabel": "Residential First Mortgages [Member]"
       }
      }
     },
     "localname": "ResidentialFirstMortgagesMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ResidentialReaLEstateAndConsumerHomeEquityAndLinesOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Residential Rea lEstate And Consumer Home equity and lines of credit [Member]",
        "verboseLabel": "Residential real estate and consumer Home equity and lines of credit"
       }
      }
     },
     "localname": "ResidentialReaLEstateAndConsumerHomeEquityAndLinesOfCreditMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ResidentialRealEstateAndConsumerFirstMortgageMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Residential Real Estate And Consumer First Mortgage [Member]",
        "verboseLabel": "Residential real estate and consumer First mortgage [Member]"
       }
      }
     },
     "localname": "ResidentialRealEstateAndConsumerFirstMortgageMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ResidentialRealEstateConstructionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Residential real estate construction.",
        "label": "Residential Real Estate Construction [Member]",
        "terseLabel": "Residential Real Estate Construction [Member]"
       }
      }
     },
     "localname": "ResidentialRealEstateConstructionMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_ResidentialRealEstateFirstMortgagesMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Residential real estate first mortgages.",
        "label": "Residential Real Estate First Mortgages [Member]",
        "terseLabel": "Residential Real Estate First Mortgages [Member]"
       }
      }
     },
     "localname": "ResidentialRealEstateFirstMortgagesMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_RestatedMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Restated [Member].",
        "label": "Restated [Member]"
       }
      }
     },
     "localname": "RestatedMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_RetainedEarningsExcludingDeferredFederalOrStateIncomeTaxes": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount represents the value of retained earnings excluding deferred federal or state income taxes.",
        "label": "Retained Earnings Excluding Deferred Federal Or state Income Taxes",
        "verboseLabel": "Retained Earnings"
       }
      }
     },
     "localname": "RetainedEarningsExcludingDeferredFederalOrStateIncomeTaxes",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_RetirementOfCommonStock": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Retirement of common stock.",
        "label": "Retirement of common stock"
       }
      }
     },
     "localname": "RetirementOfCommonStock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_RetirementOfCommonStockIssuedOneValue": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Retirement of common stock issued one value.",
        "label": "Retirement Of Common Stock Issued One Value",
        "terseLabel": "Retirement of common stock"
       }
      }
     },
     "localname": "RetirementOfCommonStockIssuedOneValue",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_RetirementOfTreasuryStockIssuedOneValue": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Retirement of treasury stock issued one value.",
        "label": "Retirement Of Treasury Stock Issued One Value",
        "terseLabel": "Retirement of treasury stock"
       }
      }
     },
     "localname": "RetirementOfTreasuryStockIssuedOneValue",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_ScheduleOfInterestExpenseOnDepositsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of schedule of interest expense decision.",
        "label": "Schedule Of Interest Expense On Deposits [Table Text Block]",
        "verboseLabel": "Interest Expense on Deposits"
       }
      }
     },
     "localname": "ScheduleOfInterestExpenseOnDepositsTableTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_ScheduleOfLoansClassIndividuallyAndCollectivelyEvaluatedForImpairmentTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule of loans class individually and collectively evaluated for impairment.",
        "label": "Schedule Of Loans Class Individually And Collectively Evaluated For Impairment [Table Text Block]",
        "terseLabel": "Summary of Allowance for Loan and Lease Losses for Loans Evaluated Individually and Collectively for Impairment"
       }
      }
     },
     "localname": "ScheduleOfLoansClassIndividuallyAndCollectivelyEvaluatedForImpairmentTableTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule of Share Based Compensation Nonvested Stock Options Activity.",
        "label": "Schedule of Share Based Compensation Nonvested Stock Options Activity [Table Text Block]",
        "terseLabel": "Summary of Nonvested Stock option Activity"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Schedule Of Share Based Compensation Restricted Stock Units Award Activity [Abstract]"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityAbstract",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "xbrltype": "stringItemType"
    },
    "bcow_ScheduleOfShareBasedCompensationStockOptionsActivityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Schedule of share based compensation stock options activity [Abstract]"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityAbstract",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "xbrltype": "stringItemType"
    },
    "bcow_ScheduleOfShareBasedCompensationStockOptionsActivityLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Schedule Of Share Based Compensation Stock Options Activity [Line Items]",
        "terseLabel": "Schedule of share based compensation stock options activity [Line Items]"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityLineItems",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "bcow_ScheduleOfShareBasedCompensationStockOptionsActivityTable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Schedule Of Share Based Compensation Stock Options Activity [Table]",
        "terseLabel": "Schedule of share based compensation stock options activity [Table]"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityTable",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "bcow_ServiceChargesAndOtherFees": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 14.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Service charges and other fees.",
        "label": "Service Charges And Other Fees",
        "terseLabel": "Service charges and other fees"
       }
      }
     },
     "localname": "ServiceChargesAndOtherFees",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_ShareBasedCompensationArrangementAwardOptionForfeitureInPeriodTotalIntrinsicValue": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Share Based Compensation Arrangement Award Option Forfeiture In Period Total Intrinsic Value .",
        "label": "Share Based Compensation Arrangement Award Option Forfeiture In Period Total Intrinsic Value",
        "terseLabel": "Aggregate Intrinsic Value, Forfeited"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementAwardOptionForfeitureInPeriodTotalIntrinsicValue",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_SharebasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedVestedNumberOfShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Share based compensation arrangement by share based payment award options nonvested vested number of shares.",
        "label": "ShareBased Compensation Arrangement By Share Based Payment Award Options Nonvested Vested Number Of Shares",
        "terseLabel": "Vested"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedVestedNumberOfShares",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "bcow_SharebasedCompensationArrangementEquityInstrumentsOtherThanOptionsVestedRealtedToSharesSurrendersToCoverPayrollTaxesInPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "ShareBased compensation arrangement equity instruments other than options vested realted to shares surrenders to cover payroll taxes in period.",
        "label": "Sharebased Compensation Arrangement Equity Instruments Other Than Options Vested Realted To Shares Surrenders To Cover Payroll Taxes In Period",
        "terseLabel": "Restrcited shares vested related to shares surrenders to cover payroll taxes"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementEquityInstrumentsOtherThanOptionsVestedRealtedToSharesSurrendersToCoverPayrollTaxesInPeriod",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "bcow_SharebasedCompensationAwardTrancheFiveMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Sharebased Compensation Award Tranche Five [Member]",
        "terseLabel": "Share-based Compensation Award Tranche Five [Member]"
       }
      }
     },
     "localname": "SharebasedCompensationAwardTrancheFiveMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_SharebasedCompensationAwardTrancheFourMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Sharebased Compensation Award Tranche Four [Member]",
        "terseLabel": "Share-based Compensation Award Tranche Four [Member]"
       }
      }
     },
     "localname": "SharebasedCompensationAwardTrancheFourMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsnonvestedgrantednumberofshares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Share based compensation arrangement by share based payment award options nonvested granted number of shares.",
        "label": "Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsnonvestedgrantednumberofshares",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsnonvestedgrantednumberofshares",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "bcow_SharesCommittedToBeReleased": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Shares committed to be released.",
        "label": "Shares committed to be released",
        "verboseLabel": "Shares committed to be released"
       }
      }
     },
     "localname": "SharesCommittedToBeReleased",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "bcow_StockCompensationExpense": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 36.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Stock compensation expense.",
        "label": "Stock Compensation Expense",
        "terseLabel": "Stock compensation expense"
       }
      }
     },
     "localname": "StockCompensationExpense",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_SummaryOfInternalRiskRatingOfLoansTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Summary of internal risk rating of loans.",
        "label": "Summary of Internal Risk Rating of Loans [Table Text Block]",
        "terseLabel": "Summary of Internal Risk Ratings of Loans"
       }
      }
     },
     "localname": "SummaryOfInternalRiskRatingOfLoansTableTextBlock",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "bcow_TreasuryStockValueIssuedCostMethod": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Treasury stock value issued cost method.",
        "label": "Treasury Stock Value Issued Cost Method",
        "terseLabel": "Sales of treasury stock by Rabbi Trust"
       }
      }
     },
     "localname": "TreasuryStockValueIssuedCostMethod",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_TwentyTwentyEquityIncentivePlanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Twenty Twenty Equity Incentive Plan [Member]",
        "terseLabel": "Twenty twenty equity incentive plan [Member]"
       }
      }
     },
     "localname": "TwentyTwentyEquityIncentivePlanMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_UnallocatedCommonStockOfEsopMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Unallocated Common Stock Of ESOP [Member]",
        "verboseLabel": "Unallocated common stock of ESOP"
       }
      }
     },
     "localname": "UnallocatedCommonStockOfEsopMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_UnexpectedEventAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Unexpected event [Axis].",
        "label": "Unexpected Event [Axis]",
        "terseLabel": "Unexpected Event [Axis]"
       }
      }
     },
     "localname": "UnexpectedEventAxis",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "bcow_UnexpectedEventDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Unexpected event [Domain].",
        "label": "Unexpected Event [Domain]",
        "terseLabel": "Unexpected Event [Domain]"
       }
      }
     },
     "localname": "UnexpectedEventDomain",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_UnpaidPrincipalBalanceOfLoansServicedForOthers": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Unpaid Principal Balance of Loans Serviced for Others",
        "label": "Unpaid Principal Balance of Loans Serviced for Others",
        "terseLabel": "Unpaid principal balance of mortgage loans serviced for others"
       }
      }
     },
     "localname": "UnpaidPrincipalBalanceOfLoansServicedForOthers",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "bcow_VariableRateMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Variable rate.",
        "label": "Variable Rate [Member]",
        "terseLabel": "Variable Rate [Member]"
       }
      }
     },
     "localname": "VariableRateMember",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "bcow_WeightedAverageNumberOfSharesOutstandingBasicAndDilutedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Weighted Average Number of Shares Outstanding Basic And Diluted [Abstract]",
        "verboseLabel": "Average common shares outstanding:"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasicAndDilutedAbstract",
     "nsuri": "http://www.1895bancorpofwisconsin.com/20211231",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag",
        "terseLabel": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_AuditorFirmId": {
     "auth_ref": [
      "r736",
      "r737",
      "r738"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "PCAOB issued Audit Firm Identifier",
        "label": "Auditor Firm ID"
       }
      }
     },
     "localname": "AuditorFirmId",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "nonemptySequenceNumberItemType"
    },
    "dei_AuditorLocation": {
     "auth_ref": [
      "r736",
      "r737",
      "r738"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Auditor Location"
       }
      }
     },
     "localname": "AuditorLocation",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "internationalNameItemType"
    },
    "dei_AuditorName": {
     "auth_ref": [
      "r736",
      "r737",
      "r738"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Auditor Name"
       }
      }
     },
     "localname": "AuditorName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "internationalNameItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code",
        "terseLabel": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CoverAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Cover page.",
        "label": "Cover [Abstract]"
       }
      }
     },
     "localname": "CoverAbstract",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "xbrltype": "stringItemType"
    },
    "dei_CurrentFiscalYearEndDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "End date of current fiscal year in the format --MM-DD.",
        "label": "Current Fiscal Year End Date",
        "terseLabel": "Current Fiscal Year End Date"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "dei_DocumentAnnualReport": {
     "auth_ref": [
      "r736",
      "r737",
      "r738"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an annual report.",
        "label": "Document Annual Report"
       }
      }
     },
     "localname": "DocumentAnnualReport",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentFiscalPeriodFocus": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
        "label": "Document Fiscal Period Focus",
        "terseLabel": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.",
        "label": "Document Fiscal Year Focus",
        "terseLabel": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "gYearItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.",
        "label": "Document Period End Date",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r739"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report",
        "terseLabel": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type",
        "terseLabel": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_DocumentsIncorporatedByReferenceTextBlock": {
     "auth_ref": [
      "r734"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Documents incorporated by reference.",
        "label": "Documents Incorporated by Reference [Text Block]",
        "terseLabel": "Documents Incorporated by Reference"
       }
      }
     },
     "localname": "DocumentsIncorporatedByReferenceTextBlock",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "textBlockItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address, Address Line One",
        "terseLabel": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town",
        "terseLabel": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code",
        "terseLabel": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address, State or Province",
        "terseLabel": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key",
        "terseLabel": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
        "label": "Entity Common Stock, Shares Outstanding",
        "terseLabel": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "sharesItemType"
    },
    "dei_EntityCurrentReportingStatus": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Current Reporting Status",
        "terseLabel": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.",
        "label": "Entity [Domain]"
       }
      }
     },
     "localname": "EntityDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company",
        "terseLabel": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityExTransitionPeriod": {
     "auth_ref": [
      "r773"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.",
        "label": "Entity Ex Transition Period",
        "terseLabel": "Entity Ex Transition Period"
       }
      }
     },
     "localname": "EntityExTransitionPeriod",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number",
        "terseLabel": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Filer Category",
        "terseLabel": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation, State or Country Code",
        "terseLabel": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r771"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
        "label": "Entity Interactive Data Current",
        "terseLabel": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityPublicFloat": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.",
        "label": "Entity Public Float"
       }
      }
     },
     "localname": "EntityPublicFloat",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "monetaryItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name",
        "terseLabel": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
        "label": "Entity Shell Company",
        "terseLabel": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).",
        "label": "Entity Small Business",
        "terseLabel": "Entity Small Business"
       }
      }
     },
     "localname": "EntitySmallBusiness",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r733"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity Tax Identification Number",
        "terseLabel": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_EntityVoluntaryFilers": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.",
        "label": "Entity Voluntary Filers"
       }
      }
     },
     "localname": "EntityVoluntaryFilers",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityWellKnownSeasonedIssuer": {
     "auth_ref": [
      "r772"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.",
        "label": "Entity Well-known Seasoned Issuer"
       }
      }
     },
     "localname": "EntityWellKnownSeasonedIssuer",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_IcfrAuditorAttestationFlag": {
     "auth_ref": [
      "r736",
      "r737",
      "r738"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "ICFR Auditor Attestation Flag"
       }
      }
     },
     "localname": "IcfrAuditorAttestationFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_LegalEntityAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The set of legal entities associated with a report.",
        "label": "Legal Entity [Axis]"
       }
      }
     },
     "localname": "LegalEntityAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number",
        "terseLabel": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r732"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security",
        "terseLabel": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name",
        "terseLabel": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol",
        "terseLabel": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CoverPage"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "srt_CounterpartyNameAxis": {
     "auth_ref": [
      "r39",
      "r41",
      "r110",
      "r111",
      "r310",
      "r331"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Counterparty Name [Axis]",
        "terseLabel": "Counterparty Name [Axis]"
       }
      }
     },
     "localname": "CounterpartyNameAxis",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_MaximumMember": {
     "auth_ref": [
      "r309",
      "r330",
      "r379",
      "r380",
      "r544",
      "r545",
      "r546",
      "r551",
      "r552",
      "r553",
      "r589",
      "r692",
      "r694",
      "r730",
      "r731"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Maximum [Member]",
        "terseLabel": "Maximum [Member]"
       }
      }
     },
     "localname": "MaximumMember",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MinimumMember": {
     "auth_ref": [
      "r309",
      "r330",
      "r379",
      "r380",
      "r544",
      "r545",
      "r546",
      "r551",
      "r552",
      "r553",
      "r589",
      "r692",
      "r694",
      "r730",
      "r731"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Minimum [Member]",
        "terseLabel": "Minimum [Member]"
       }
      }
     },
     "localname": "MinimumMember",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ProductOrServiceAxis": {
     "auth_ref": [
      "r169",
      "r348",
      "r349",
      "r590",
      "r691",
      "r693"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Product and Service [Axis]"
       }
      }
     },
     "localname": "ProductOrServiceAxis",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ProductsAndServicesDomain": {
     "auth_ref": [
      "r169",
      "r348",
      "r349",
      "r590",
      "r691",
      "r693"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Product and Service [Domain]"
       }
      }
     },
     "localname": "ProductsAndServicesDomain",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [
      "r309",
      "r330",
      "r354",
      "r379",
      "r380",
      "r544",
      "r545",
      "r546",
      "r551",
      "r552",
      "r553",
      "r589",
      "r692",
      "r694",
      "r730",
      "r731"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Range [Axis]",
        "terseLabel": "Range [Axis]"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [
      "r309",
      "r330",
      "r354",
      "r379",
      "r380",
      "r544",
      "r545",
      "r546",
      "r551",
      "r552",
      "r553",
      "r589",
      "r692",
      "r694",
      "r730",
      "r731"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Range [Domain]",
        "terseLabel": "Range [Domain]"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RepurchaseAgreementCounterpartyNameDomain": {
     "auth_ref": [
      "r40",
      "r41",
      "r110",
      "r111",
      "r310",
      "r331"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Counterparty Name [Domain]",
        "terseLabel": "Counterparty Name [Domain]"
       }
      }
     },
     "localname": "RepurchaseAgreementCounterpartyNameDomain",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RestatementAxis": {
     "auth_ref": [
      "r1",
      "r114",
      "r115",
      "r116",
      "r117",
      "r118",
      "r119",
      "r120",
      "r121",
      "r122",
      "r124",
      "r125",
      "r126",
      "r127",
      "r128",
      "r129",
      "r144",
      "r239",
      "r240",
      "r419",
      "r455",
      "r490",
      "r491",
      "r492",
      "r493",
      "r695",
      "r696",
      "r697",
      "r698",
      "r699",
      "r700",
      "r701",
      "r702",
      "r703",
      "r704",
      "r774",
      "r775"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Revision of Prior Period [Axis]"
       }
      }
     },
     "localname": "RestatementAxis",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RestatementDomain": {
     "auth_ref": [
      "r1",
      "r114",
      "r115",
      "r116",
      "r117",
      "r118",
      "r119",
      "r120",
      "r121",
      "r122",
      "r124",
      "r125",
      "r126",
      "r127",
      "r128",
      "r129",
      "r144",
      "r239",
      "r240",
      "r419",
      "r455",
      "r490",
      "r491",
      "r492",
      "r493",
      "r695",
      "r696",
      "r697",
      "r698",
      "r699",
      "r700",
      "r701",
      "r702",
      "r703",
      "r704",
      "r774",
      "r775"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Revision of Prior Period [Domain]"
       }
      }
     },
     "localname": "RestatementDomain",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_TitleOfIndividualAxis": {
     "auth_ref": [
      "r170",
      "r529"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Title of Individual [Axis]"
       }
      }
     },
     "localname": "TitleOfIndividualAxis",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_TitleOfIndividualWithRelationshipToEntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Title of Individual [Domain]"
       }
      }
     },
     "localname": "TitleOfIndividualWithRelationshipToEntityDomain",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": {
     "auth_ref": [
      "r26",
      "r275"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.",
        "label": "Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment",
        "verboseLabel": "Less: Accumulated depreciation"
       }
      }
     },
     "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r19",
      "r44",
      "r46",
      "r47",
      "r674",
      "r700",
      "r704"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 9.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax",
        "terseLabel": "Accumulated other comprehensive income, net of income taxes"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "auth_ref": [
      "r43",
      "r47",
      "r57",
      "r58",
      "r59",
      "r114",
      "r115",
      "r116",
      "r478",
      "r695",
      "r696",
      "r775"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.",
        "label": "AOCI Attributable to Parent [Member]",
        "verboseLabel": "Accumulated other comprehensive income (loss)"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalPaidInCapital": {
     "auth_ref": [
      "r17",
      "r419",
      "r535"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 11.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock.",
        "label": "Additional Paid in Capital",
        "verboseLabel": "Additional\u00a0paid-in\u00a0capital"
       }
      }
     },
     "localname": "AdditionalPaidInCapital",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdditionalPaidInCapitalMember": {
     "auth_ref": [
      "r114",
      "r115",
      "r116",
      "r416",
      "r417",
      "r418",
      "r491"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.",
        "label": "Additional Paid-in Capital [Member]",
        "verboseLabel": "Additional paid-in capital"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": {
     "auth_ref": [
      "r382",
      "r384",
      "r422",
      "r423"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.",
        "label": "APIC, Share-based Payment Arrangement, Increase for Cost Recognition",
        "terseLabel": "Stock compensation expense"
       }
      }
     },
     "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts": {
     "auth_ref": [
      "r335",
      "r336"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.",
        "label": "Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs",
        "negatedLabel": "Stock offering costs"
       }
      }
     },
     "localname": "AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Adjustments to reconcile net income to net cash from operating activities:"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AdvancePaymentsByBorrowersForTaxesAndInsurance": {
     "auth_ref": [
      "r617"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 3.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Carrying amount of accumulated prepayments received by financial institutions from borrowers for taxes (for example, property taxes) and insurance (for example, property and catastrophe) which will periodically be remitted to the appropriate governmental agency or vendor on behalf of the borrower.",
        "label": "Advance Payments by Borrowers for Taxes and Insurance",
        "terseLabel": "Advance payments by borrowers for taxes and insurance",
        "verboseLabel": "Advance payments by borrowers for taxes and insurance"
       }
      }
     },
     "localname": "AdvancePaymentsByBorrowersForTaxesAndInsurance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdvancesFromFederalHomeLoanBanks": {
     "auth_ref": [
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 4.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "definitionGuidance": "FHLB advances",
        "documentation": "Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.",
        "label": "Advances from Federal Home Loan Banks",
        "terseLabel": "FHLB advances",
        "totalLabel": "Total",
        "verboseLabel": "FHLB Advances, total"
       }
      }
     },
     "localname": "AdvancesFromFederalHomeLoanBanks",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdvertisingCostsPolicyTextBlock": {
     "auth_ref": [
      "r431"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for advertising cost.",
        "label": "Advertising Costs, Policy [Policy Text Block]",
        "verboseLabel": "Advertising"
       }
      }
     },
     "localname": "AdvertisingCostsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AllocatedShareBasedCompensationExpense": {
     "auth_ref": [
      "r384",
      "r412",
      "r421"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.",
        "label": "Share-based Payment Arrangement, Expense",
        "terseLabel": "Stock option expense recognised"
       }
      }
     },
     "localname": "AllocatedShareBasedCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock": {
     "auth_ref": [
      "r181",
      "r245"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of allowance for credit loss on financing receivable.",
        "label": "Allowance for Credit Losses on Financing Receivables [Table Text Block]",
        "terseLabel": "Summary of Activity in Allowance for Loan and Lease Losses"
       }
      }
     },
     "localname": "AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AlternativeInvestmentMeasurementInput": {
     "auth_ref": [
      "r499"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Value of input used to measure alternative investment.",
        "label": "Alternative Investment, Measurement Input",
        "terseLabel": "Discount rates"
       }
      }
     },
     "localname": "AlternativeInvestmentMeasurementInput",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "decimalItemType"
    },
    "us-gaap_AssetBackedSecuritiesMember": {
     "auth_ref": [
      "r222",
      "r355"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans.",
        "label": "Asset-backed Securities [Member]",
        "terseLabel": "Asset-backed Securities [Member]",
        "verboseLabel": "Asset-backed securities [Member]"
       }
      }
     },
     "localname": "AssetBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r104",
      "r161",
      "r163",
      "r167",
      "r235",
      "r295",
      "r296",
      "r297",
      "r298",
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r473",
      "r479",
      "r510",
      "r533",
      "r535",
      "r608",
      "r673"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets",
        "totalLabel": "TOTAL ASSETS"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Assets [Abstract]",
        "terseLabel": "Assets",
        "verboseLabel": "Financial assets:"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsFairValueDisclosure": {
     "auth_ref": [
      "r494"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets, Fair Value Disclosure",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "AssetsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": {
     "auth_ref": [
      "r213",
      "r262"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Amortized Cost",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecurities": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesAmortizedCost",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 18.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.",
        "label": "Available-for-sale Securities",
        "positiveLabel": "Available for sale securities",
        "terseLabel": "Available for sale securities, stated at fair value",
        "verboseLabel": "Securities Available for Sale, Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": {
     "auth_ref": [
      "r215"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesAmortizedCost",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax",
        "terseLabel": "Securities Available for Sale, Gross Unrealized Gains"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesAmortizedCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax",
        "negatedLabel": "Securities Available for Sale, Gross Unrealized Losses"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAmortizedCost": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.",
        "label": "Available-for-sale Securities, Amortized Cost Basis",
        "totalLabel": "Securities Available for Sale, Amortized Cost"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value",
        "totalLabel": "Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]",
        "verboseLabel": "Summary of Gross Unrealized Losses on Securities Available-for-sale and Fair Values"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value",
        "terseLabel": "Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value",
        "terseLabel": "Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost": {
     "auth_ref": [
      "r219"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost",
        "terseLabel": "Due after 5 through 10 years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": {
     "auth_ref": [
      "r216",
      "r219",
      "r649"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 8.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value",
        "terseLabel": "Due after 5 through 10 years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost": {
     "auth_ref": [
      "r218"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost",
        "terseLabel": "Due after one through 5 years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": {
     "auth_ref": [
      "r216",
      "r218",
      "r648"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 7.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value",
        "terseLabel": "Due after one through 5 years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost": {
     "auth_ref": [
      "r220"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost",
        "terseLabel": "Due after 10 years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue": {
     "auth_ref": [
      "r216",
      "r220",
      "r650"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 9.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value",
        "terseLabel": "Due after 10 years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate": {
     "auth_ref": [
      "r216",
      "r221",
      "r651"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 10.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value",
        "terseLabel": "Subtotal"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis": {
     "auth_ref": [
      "r216",
      "r221",
      "r646"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost",
        "terseLabel": "Subtotal"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost": {
     "auth_ref": [
      "r217"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost",
        "terseLabel": "Due in one year or less"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue": {
     "auth_ref": [
      "r216",
      "r217",
      "r647"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": 6.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value",
        "terseLabel": "Due in one year or less"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtSecurities": {
     "auth_ref": [
      "r211",
      "r214",
      "r262",
      "r612"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale",
        "terseLabel": "Securities available-for-sale",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtSecurities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 32.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.",
        "label": "Available-for-sale Securities, Gross Realized Gain (Loss)",
        "negatedLabel": "Net gain on sale of available for sale securities"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesGrossRealizedGainLossNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesGrossRealizedGains": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Gross Realized Gains",
        "terseLabel": "Gross realized gains"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesGrossRealizedGains",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfProceedsFromSalesOfSecuritiesAvailableForSaleAsWellAsGrossGainsAndLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherDefaultRate": {
     "auth_ref": [
      "r226"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the default rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.",
        "label": "Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate",
        "terseLabel": "Percentage of depreciation from amortized cost bases"
       }
      }
     },
     "localname": "AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherDefaultRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_AwardTypeAxis": {
     "auth_ref": [
      "r385",
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of award under share-based payment arrangement.",
        "label": "Award Type [Axis]",
        "terseLabel": "Award type [Axis]"
       }
      }
     },
     "localname": "AwardTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BuildingMember": {
     "auth_ref": [
      "r274"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Facility held for productive use including, but not limited to, office, production, storage and distribution facilities.",
        "label": "Building [Member]"
       }
      }
     },
     "localname": "BuildingMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_Capital": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of total capital as defined by regulatory framework.",
        "label": "Capital",
        "terseLabel": "Common Equity Tier 1 risk based capital actual amount"
       }
      }
     },
     "localname": "Capital",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalRequiredForCapitalAdequacy": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.",
        "label": "Capital Required for Capital Adequacy",
        "terseLabel": "Common Equity Tier 1 risk based capital for capital adequacy purposes amount"
       }
      }
     },
     "localname": "CapitalRequiredForCapitalAdequacy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.",
        "label": "Capital Required for Capital Adequacy to Risk Weighted Assets",
        "terseLabel": "Common Equity Tier 1 risk based capital for capital adequacy purposes ratio"
       }
      }
     },
     "localname": "CapitalRequiredForCapitalAdequacyToRiskWeightedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_CapitalRequiredToBeWellCapitalized": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Capital Required to be Well Capitalized",
        "terseLabel": "Common Equity Tier 1 risk based capital to be well capitalized under prompt corrective action provisions amount"
       }
      }
     },
     "localname": "CapitalRequiredToBeWellCapitalized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Capital Required to be Well Capitalized to Risk Weighted Assets",
        "terseLabel": "Common Equity Tier 1 risk based capital to be well capitalized under prompt corrective action provisions ratio"
       }
      }
     },
     "localname": "CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_CapitalToRiskWeightedAssets": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.",
        "label": "Capital to Risk Weighted Assets",
        "terseLabel": "Common Equity Tier 1 risk based capital actual ratio"
       }
      }
     },
     "localname": "CapitalToRiskWeightedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_CarryingReportedAmountFairValueDisclosureMember": {
     "auth_ref": [
      "r508",
      "r509"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Measured as reported on the statement of financial position (balance sheet).",
        "label": "Reported Value Measurement [Member]"
       }
      }
     },
     "localname": "CarryingReportedAmountFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CashAndCashEquivalentsAtCarryingValue": {
     "auth_ref": [
      "r4",
      "r23",
      "r92"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "label": "Cash and Cash Equivalents, at Carrying Value",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsDisclosureTextBlock": {
     "auth_ref": [
      "r6"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for cash and cash equivalent footnotes,  which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.",
        "label": "Cash and Cash Equivalents Disclosure [Text Block]",
        "terseLabel": "Cash and Due from Banks"
       }
      }
     },
     "localname": "CashAndCashEquivalentsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanks"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CashAndCashEquivalentsPolicyTextBlock": {
     "auth_ref": [
      "r6",
      "r94"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.",
        "label": "Cash and Cash Equivalents, Policy [Policy Text Block]",
        "verboseLabel": "Cash and Cash Equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CashAndDueFromBanks": {
     "auth_ref": [
      "r606"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 16.0,
       "parentTag": "us-gaap_CashCashEquivalentsAndFederalFundsSold",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.",
        "label": "Cash and Due from Banks",
        "terseLabel": "Cash and due from banks"
       }
      }
     },
     "localname": "CashAndDueFromBanks",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsAndFederalFundsSold": {
     "auth_ref": [
      "r614"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 15.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days.",
        "label": "Cash, Cash Equivalents, and Federal Funds Sold",
        "totalLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashCashEquivalentsAndFederalFundsSold",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": {
     "auth_ref": [
      "r84",
      "r92",
      "r99"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations",
        "periodEndLabel": "Cash and cash equivalents at end of year",
        "periodStartLabel": "Cash and cash equivalents at beginning of year"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": {
     "auth_ref": [
      "r84",
      "r511"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect",
        "totalLabel": "Net (decrease) increase in cash and cash equivalents"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashFDICInsuredAmount": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.",
        "label": "Cash, FDIC Insured Amount",
        "terseLabel": "Certificates of deposit federally insured"
       }
      }
     },
     "localname": "CashFDICInsuredAmount",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/DepositsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashSurrenderValueOfLifeInsurance": {
     "auth_ref": [
      "r5",
      "r27"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 25.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.",
        "label": "Cash Surrender Value of Life Insurance",
        "terseLabel": "Cash value of life insurance",
        "verboseLabel": "Cash value of life insurance"
       }
      }
     },
     "localname": "CashSurrenderValueOfLifeInsurance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CertificatesOfDepositMember": {
     "auth_ref": [
      "r658"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Short to medium-term investment available at banks and savings and loan institutions where a customer agrees to lend money to the institution for a certain amount of time and is paid a predetermined rate of interest. Certificates of deposit (CD) are typically Federal Deposit Insurance Corporation (FDIC) insured.",
        "label": "Certificates of Deposit [Member]",
        "terseLabel": "Certificates of Deposit [Member]",
        "verboseLabel": "Certificates of deposit [Member]"
       }
      }
     },
     "localname": "CertificatesOfDepositMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ClassOfStockDomain": {
     "auth_ref": [
      "r102",
      "r104",
      "r134",
      "r135",
      "r136",
      "r138",
      "r140",
      "r148",
      "r149",
      "r150",
      "r235",
      "r295",
      "r299",
      "r300",
      "r301",
      "r304",
      "r305",
      "r328",
      "r329",
      "r332",
      "r333",
      "r510",
      "r740"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Share of stock differentiated by the voting rights the holder receives. Examples include, but are not limited to, common stock, redeemable preferred stock, nonredeemable preferred stock, and convertible stock.",
        "label": "Class of Stock [Domain]"
       }
      }
     },
     "localname": "ClassOfStockDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CollateralAxis": {
     "auth_ref": [
      "r256"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by category of collateral or no collateral, from lender's perspective.",
        "label": "Collateral [Axis]"
       }
      }
     },
     "localname": "CollateralAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CollateralDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Category of collateral or no collateral, from lender's perspective.",
        "label": "Collateral [Domain]"
       }
      }
     },
     "localname": "CollateralDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommercialLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A loan, whether secured or unsecured, to a company for purposes such as seasonal working capital needs, inventory financing, equipment purchases and acquisitions.",
        "label": "Commercial Loan [Member]",
        "terseLabel": "Commercial [Member]"
       }
      }
     },
     "localname": "CommercialLoanMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommercialRealEstateMember": {
     "auth_ref": [
      "r258",
      "r355"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Property that is solely used for business purposes.",
        "label": "Commercial Real Estate [Member]",
        "terseLabel": "Commercial Real Estate [Member]"
       }
      }
     },
     "localname": "CommercialRealEstateMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Commitments and Contingencies Disclosure [Abstract]"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": {
     "auth_ref": [
      "r278",
      "r279",
      "r280",
      "r288",
      "r726"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for commitments and contingencies.",
        "label": "Commitments and Contingencies Disclosure [Text Block]",
        "terseLabel": "Commitments and Contingencies"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommitmentsToExtendCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan commitments are legally binding commitments to extend credit to a counterparty under certain terms and conditions.",
        "label": "Commitments to Extend Credit [Member]",
        "terseLabel": "Commitments to Extend Credit [Member]"
       }
      }
     },
     "localname": "CommitmentsToExtendCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonEquityTierOneCapital": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework.",
        "label": "Common Equity Tier One Capital",
        "terseLabel": "Leverage tier 1 capital actual amount"
       }
      }
     },
     "localname": "CommonEquityTierOneCapital",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommonEquityTierOneCapitalRatio": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.",
        "label": "Common Equity Tier One Capital Ratio",
        "terseLabel": "Leverage tier 1 capital actual ratio"
       }
      }
     },
     "localname": "CommonEquityTierOneCapitalRatio",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum Common Equity Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Common Equity Tier One Capital Required to be Well-Capitalized",
        "terseLabel": "Leverage tier 1 capital to be well capitalized under prompt corrective action provisions amount"
       }
      }
     },
     "localname": "CommonEquityTierOneCapitalRequiredToBeWellCapitalized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommonStockMember": {
     "auth_ref": [
      "r114",
      "r115",
      "r491"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Stock that is subordinate to all other stock of the issuer.",
        "label": "Common Stock [Member]",
        "verboseLabel": "Common\u00a0stock"
       }
      }
     },
     "localname": "CommonStockMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r15"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Face amount or stated value per share of common stock.",
        "label": "Common Stock, Par or Stated Value Per Share"
       }
      }
     },
     "localname": "CommonStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockSharesAuthorized": {
     "auth_ref": [
      "r15"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.",
        "label": "Common Stock, Shares Authorized"
       }
      }
     },
     "localname": "CommonStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesIssued": {
     "auth_ref": [
      "r15"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.",
        "label": "Common Stock, Shares, Issued"
       }
      }
     },
     "localname": "CommonStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesOutstanding": {
     "auth_ref": [
      "r15",
      "r335"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.",
        "label": "Common Stock, Shares, Outstanding",
        "terseLabel": "Common Stock, Shares, Outstanding"
       }
      }
     },
     "localname": "CommonStockSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockValue": {
     "auth_ref": [
      "r15",
      "r535"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 10.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Common Stock, Value, Issued",
        "presentationGuidance": "Common stock (par value $0.01 per share) Authorized - 90,000,000 shares at December 31, 2021 and December 31, 2020 Issued - 6,402,571 at December 31, 2021 and 4,961,626 at December 31, 2020 (includes 97,128 and 84,949 unvested shares, respectively) Outstanding - 6,372,508 at December 31, 2021 and 4,834,401 at December 31, 2020 (includes 97,128 and 84,949 unvested shares, respectively)"
       }
      }
     },
     "localname": "CommonStockValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CompensationAndRetirementDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Retirement Benefits [Abstract]"
       }
      }
     },
     "localname": "CompensationAndRetirementDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CompensationRelatedCostsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Compensation Related Costs [Abstract]"
       }
      }
     },
     "localname": "CompensationRelatedCostsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_ComponentsOfDeferredTaxAssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Components of Deferred Tax Assets [Abstract]",
        "verboseLabel": "Deferred tax assets:"
       }
      }
     },
     "localname": "ComponentsOfDeferredTaxAssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Components of Deferred Tax Liabilities [Abstract]",
        "verboseLabel": "Deferred tax liabilities:"
       }
      }
     },
     "localname": "ComponentsOfDeferredTaxLiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "auth_ref": [
      "r52",
      "r54",
      "r55",
      "r66",
      "r627",
      "r681"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent",
        "totalLabel": "Comprehensive (loss) income"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomePolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for comprehensive income.",
        "label": "Comprehensive Income, Policy [Policy Text Block]",
        "verboseLabel": "Other Comprehensive Loss"
       }
      }
     },
     "localname": "ComprehensiveIncomePolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ConcentrationRiskDisclosureTextBlock": {
     "auth_ref": [
      "r158"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.",
        "label": "Concentration Risk Disclosure [Text Block]",
        "terseLabel": "Concentration of Credit Risk"
       }
      }
     },
     "localname": "ConcentrationRiskDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConcentrationOfCreditRisk"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ConstructionLoansMember": {
     "auth_ref": [
      "r725"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A borrowing arrangement which provides the entity constructing a facility (such as a building and a landfill) with funds to effect construction, generally on a draw down, or as needed, basis.",
        "label": "Construction Loans [Member]",
        "terseLabel": "Construction Loans [Member]"
       }
      }
     },
     "localname": "ConstructionLoansMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ConsumerLoanMember": {
     "auth_ref": [
      "r260"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan or extension of credit for personal, family, or household use excluding real estate.",
        "label": "Consumer Loan [Member]",
        "terseLabel": "Consumer [Member]"
       }
      }
     },
     "localname": "ConsumerLoanMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ContractualObligation": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.",
        "label": "Contractual Obligation",
        "terseLabel": "Commitments"
       }
      }
     },
     "localname": "ContractualObligation",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CostOfGoodsAndServicesSold": {
     "auth_ref": [
      "r70",
      "r590"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.",
        "label": "Cost of Goods and Services Sold",
        "terseLabel": "Cost of Goods and Services Sold"
       }
      }
     },
     "localname": "CostOfGoodsAndServicesSold",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CurrentFederalTaxExpenseBenefit": {
     "auth_ref": [
      "r105",
      "r450",
      "r458"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_CurrentIncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.",
        "label": "Current Federal Tax Expense (Benefit)",
        "verboseLabel": "Federal"
       }
      }
     },
     "localname": "CurrentFederalTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CurrentIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r105",
      "r450",
      "r458",
      "r460"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.",
        "label": "Current Income Tax Expense (Benefit)",
        "totalLabel": "Total current tax expense (benefit)"
       }
      }
     },
     "localname": "CurrentIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Current Income Tax Expense (Benefit), Continuing Operations [Abstract]",
        "verboseLabel": "Current tax expense (benefit):"
       }
      }
     },
     "localname": "CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r10",
      "r11",
      "r12",
      "r103",
      "r112",
      "r306",
      "r307",
      "r308",
      "r309",
      "r310",
      "r311",
      "r312",
      "r313",
      "r314",
      "r315",
      "r316",
      "r317",
      "r318",
      "r319",
      "r320",
      "r321",
      "r322",
      "r324",
      "r325",
      "r326",
      "r327",
      "r522",
      "r609",
      "r610",
      "r671"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
        "label": "Debt Instrument [Axis]",
        "terseLabel": "Debt Instrument [Axis]"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentInterestRateIncreaseDecrease": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Incremental percentage increase (decrease) in the stated rate on a debt instrument.",
        "label": "Debt Instrument, Interest Rate, Increase (Decrease)",
        "terseLabel": "Increase decrease in interest rate"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentInterestRateStatedPercentage": {
     "auth_ref": [
      "r33",
      "r307"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.",
        "label": "Debt Instrument, Interest Rate, Stated Percentage",
        "terseLabel": "Debt instrument interest rate"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateStatedPercentage",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r34",
      "r103",
      "r112",
      "r306",
      "r307",
      "r308",
      "r309",
      "r310",
      "r311",
      "r312",
      "r313",
      "r314",
      "r315",
      "r316",
      "r317",
      "r318",
      "r319",
      "r320",
      "r321",
      "r322",
      "r324",
      "r325",
      "r326",
      "r327",
      "r522"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
        "label": "Debt Instrument, Name [Domain]",
        "terseLabel": "Debt Instrument, Name [Domain]"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": {
     "auth_ref": [
      "r227",
      "r266"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.",
        "label": "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss",
        "negatedLabel": "Unrealized Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": {
     "auth_ref": [
      "r227",
      "r266"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.",
        "label": "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss",
        "negatedLabel": "Unrealized Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleTable": {
     "auth_ref": [
      "r230"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale [Table]",
        "terseLabel": "Debt Securities, Available-for-sale [Table]"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss": {
     "auth_ref": [
      "r224",
      "r263"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.",
        "label": "Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss",
        "negatedTotalLabel": "Unrealized Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions": {
     "auth_ref": [
      "r225",
      "r264"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.",
        "label": "Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions",
        "terseLabel": "Number of debt securities with unrealized losses"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesAdditionalInformationDetail"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_DeferredCompensationLiabilityCurrent": {
     "auth_ref": [
      "r351",
      "r352"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.",
        "label": "Deferred Compensation Liability, Current",
        "verboseLabel": "Deferred Compensation Obligations"
       }
      }
     },
     "localname": "DeferredCompensationLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredFederalIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r105",
      "r451",
      "r458"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_DeferredIncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.",
        "label": "Deferred Federal Income Tax Expense (Benefit)",
        "verboseLabel": "Federal"
       }
      }
     },
     "localname": "DeferredFederalIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r90",
      "r105",
      "r451",
      "r458",
      "r459",
      "r460"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 24.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.",
        "label": "Deferred Income Tax Expense (Benefit)",
        "terseLabel": "(Benefit from) provision for deferred income tax",
        "totalLabel": "Total deferred tax expense"
       }
      }
     },
     "localname": "DeferredIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]",
        "verboseLabel": "Deferred tax expense:"
       }
      }
     },
     "localname": "DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r105",
      "r451",
      "r458"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_DeferredIncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.",
        "label": "Deferred State and Local Income Tax Expense (Benefit)",
        "verboseLabel": "State"
       }
      }
     },
     "localname": "DeferredStateAndLocalIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsGross": {
     "auth_ref": [
      "r441"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.",
        "label": "Deferred Tax Assets, Gross",
        "totalLabel": "Total deferred tax assets"
       }
      }
     },
     "localname": "DeferredTaxAssetsGross",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsLiabilitiesNet": {
     "auth_ref": [
      "r443"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.",
        "label": "Deferred Tax Assets, Net",
        "terseLabel": "Net deferred tax asset/liability"
       }
      }
     },
     "localname": "DeferredTaxAssetsLiabilitiesNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsNet": {
     "auth_ref": [
      "r443"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.",
        "label": "Deferred Tax Assets, Net of Valuation Allowance",
        "terseLabel": "Deferred tax asset net of valuation allowance",
        "verboseLabel": "Net deferred tax assets"
       }
      }
     },
     "localname": "DeferredTaxAssetsNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsOther": {
     "auth_ref": [
      "r448",
      "r449"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.",
        "label": "Deferred Tax Assets, Other",
        "verboseLabel": "Other"
       }
      }
     },
     "localname": "DeferredTaxAssetsOther",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.",
        "label": "Deferred Tax Assets, Property, Plant and Equipment",
        "verboseLabel": "Premises and equipment"
       }
      }
     },
     "localname": "DeferredTaxAssetsPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits": {
     "auth_ref": [
      "r448",
      "r449"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from employee benefits, classified as other.",
        "label": "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits",
        "verboseLabel": "Accrued employee benefits"
       }
      }
     },
     "localname": "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation": {
     "auth_ref": [
      "r448",
      "r449"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.",
        "label": "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation",
        "verboseLabel": "Deferred compensation"
       }
      }
     },
     "localname": "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses": {
     "auth_ref": [
      "r448",
      "r449"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_DeferredTaxAssetsGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on financing receivable.",
        "label": "Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses",
        "verboseLabel": "Allowance for loan losses"
       }
      }
     },
     "localname": "DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsValuationAllowance": {
     "auth_ref": [
      "r442"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.",
        "label": "Deferred Tax Assets, Valuation Allowance",
        "negatedLabel": "Valuation allowance",
        "terseLabel": "Valuation allowance"
       }
      }
     },
     "localname": "DeferredTaxAssetsValuationAllowance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxLiabilities": {
     "auth_ref": [
      "r434",
      "r443"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.",
        "label": "Deferred Tax Liabilities, Net",
        "terseLabel": "Total deferred tax liabilities"
       }
      }
     },
     "localname": "DeferredTaxLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxLiabilitiesMortgageServicingRights": {
     "auth_ref": [
      "r448",
      "r449"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from mortgage servicing rights.",
        "label": "Deferred Tax Liabilities, Mortgage Servicing Rights",
        "verboseLabel": "Mortgage servicing rights"
       }
      }
     },
     "localname": "DeferredTaxLiabilitiesMortgageServicingRights",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment": {
     "auth_ref": [
      "r448",
      "r449"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.",
        "label": "Deferred Tax Liabilities, Property, Plant and Equipment",
        "verboseLabel": "Unrealized gain on available for sale securities"
       }
      }
     },
     "localname": "DeferredTaxLiabilitiesPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid": {
     "auth_ref": [
      "r353",
      "r376"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.",
        "label": "Defined Benefit Plan, Benefit Obligation, Benefits Paid",
        "terseLabel": "Benefits paid"
       }
      }
     },
     "localname": "DefinedBenefitPlanBenefitObligationBenefitsPaid",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedContributionPlanCostRecognized": {
     "auth_ref": [
      "r377"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cost for defined contribution plan.",
        "label": "Defined Contribution Plan, Cost",
        "terseLabel": "Matching contributions"
       }
      }
     },
     "localname": "DefinedContributionPlanCostRecognized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeBenefitPlansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments": {
     "auth_ref": [
      "r656"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.",
        "label": "Deposit Liabilities, Collateral Issued, Financial Instruments",
        "terseLabel": "Collateral to secure customer deposit accounts"
       }
      }
     },
     "localname": "DepositLiabilitiesCollateralIssuedFinancialInstruments",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepositLiabilitiesDisclosuresTextBlock": {
     "auth_ref": [
      "r615",
      "r658",
      "r755",
      "r764"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for deposit liabilities including data and tables. It may include a description of the entity's deposit liabilities, the aggregate amount of time deposits (including certificates of deposit) in denominations of $100,000 or more at the balance sheet date; the aggregate amount of any demand deposits that have been reclassified as loan balances, such as overdrafts, at the balance sheet date; deposits that are received on terms other than those in the normal course of business, the amount of accrued interest on deposit liabilities; securities, mortgage loans or other financial instruments that serve as collateral for deposits; for time deposits having a remaining term of more than one year, the aggregate amount of maturities for each of the five years following the balance sheet date; and the weighted average interest rate for all deposit liabilities held by the entity.",
        "label": "Deposit Liabilities Disclosures [Text Block]",
        "terseLabel": "Deposits"
       }
      }
     },
     "localname": "DepositLiabilitiesDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/Deposits"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1": {
     "auth_ref": [
      "r657"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.",
        "label": "Deposit Liabilities Reclassified as Loans Receivable",
        "terseLabel": "Overdrawn deposit account reclassified as loan"
       }
      }
     },
     "localname": "DepositLiabilitiesReclassifiedAsLoansReceivable1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepositLiabilitiesTypeTableTextBlock": {
     "auth_ref": [
      "r756",
      "r757",
      "r758",
      "r759",
      "r760",
      "r761",
      "r762",
      "r763",
      "r764",
      "r765",
      "r766",
      "r767",
      "r768",
      "r769",
      "r770"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of type of deposit liability.",
        "label": "Deposit Liabilities, Type [Table Text Block]",
        "terseLabel": "Composition of Deposits"
       }
      }
     },
     "localname": "DepositLiabilitiesTypeTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_Deposits": {
     "auth_ref": [
      "r615"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.",
        "label": "Deposits",
        "terseLabel": "Deposits",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "Deposits",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepositsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Deposits [Abstract]",
        "terseLabel": "Banking And Thrift [Abstract]"
       }
      }
     },
     "localname": "DepositsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_Depreciation": {
     "auth_ref": [
      "r90",
      "r273"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 22.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.",
        "label": "Depreciation",
        "terseLabel": "Depreciation",
        "verboseLabel": "Depreciation of Premises and Equipment"
       }
      }
     },
     "localname": "Depreciation",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": {
     "auth_ref": [
      "r430"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for share-based payment arrangement.",
        "label": "Disclosure of Compensation Related Costs, Share-based Payments [Text Block]",
        "verboseLabel": "Employee Stock Ownership Plan"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlan"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Share-based Payment Arrangement [Abstract]",
        "terseLabel": "Disclosure of Compensation Related Costs, Share-based Payments [Abstract]",
        "verboseLabel": "Employee stock ownership plan [Abstract]"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock": {
     "auth_ref": [
      "r385",
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of share-based payment arrangement.",
        "label": "Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]",
        "terseLabel": "Stock Based Compensation"
       }
      }
     },
     "localname": "DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DomesticCountryMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Designated tax department of the government that is entitled to levy and collect income taxes from the entity in its country of domicile.",
        "label": "Domestic Tax Authority [Member]"
       }
      }
     },
     "localname": "DomesticCountryMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DoubtfulMember": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A category of financing receivables that have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.",
        "label": "Doubtful [Member]",
        "terseLabel": "Doubtful [Member]"
       }
      }
     },
     "localname": "DoubtfulMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EarningsPerShareAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Earnings Per Share [Abstract]",
        "terseLabel": "Earnings per share:"
       }
      }
     },
     "localname": "EarningsPerShareAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareBasic": {
     "auth_ref": [
      "r67",
      "r119",
      "r120",
      "r122",
      "r123",
      "r124",
      "r131",
      "r134",
      "r138",
      "r139",
      "r140",
      "r144",
      "r145",
      "r492",
      "r493",
      "r628",
      "r682"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.",
        "label": "Earnings Per Share, Basic",
        "verboseLabel": "Basic"
       }
      }
     },
     "localname": "EarningsPerShareBasic",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareBasicAndDiluted": {
     "auth_ref": [
      "r139"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements.  Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period.  Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "Earnings Per Share, Basic and Diluted",
        "terseLabel": "Basic income per share"
       }
      }
     },
     "localname": "EarningsPerShareBasicAndDiluted",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareDiluted": {
     "auth_ref": [
      "r67",
      "r119",
      "r120",
      "r122",
      "r123",
      "r124",
      "r134",
      "r138",
      "r139",
      "r140",
      "r144",
      "r145",
      "r492",
      "r493",
      "r628",
      "r682"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "Earnings Per Share, Diluted",
        "terseLabel": "Diluted income per share",
        "verboseLabel": "Diluted"
       }
      }
     },
     "localname": "EarningsPerShareDiluted",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareTextBlock": {
     "auth_ref": [
      "r141",
      "r142",
      "r143",
      "r146"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for earnings per share.",
        "label": "Earnings Per Share [Text Block]",
        "terseLabel": "Earnings Per Share"
       }
      }
     },
     "localname": "EarningsPerShareTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShare"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateContinuingOperations": {
     "auth_ref": [
      "r436"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Effective Income Tax Rate Reconciliation, Percent",
        "totalLabel": "Total income tax expense (benefit), Percentage"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateContinuingOperations",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Effective Income Tax Rate Reconciliation, Percent [Abstract]",
        "verboseLabel": "Reconciliation of statutory to effective rates: Percentage"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate": {
     "auth_ref": [
      "r106",
      "r436",
      "r461"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations",
       "weight": 1.0
      }
     },
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of domestic federal statutory tax rate applicable to pretax income (loss).",
        "label": "Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent",
        "verboseLabel": "Federal income taxes at statutory rate, Percentage"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance": {
     "auth_ref": [
      "r436",
      "r461"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 7.0,
       "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations",
       "weight": 1.0
      }
     },
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.",
        "label": "Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent",
        "verboseLabel": "Change in valuation allowance, Percentage"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments": {
     "auth_ref": [
      "r436",
      "r461"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 8.0,
       "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations",
       "weight": 1.0
      }
     },
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.",
        "label": "Effective Income Tax Rate Reconciliation, Other Adjustments, Percent",
        "verboseLabel": "Other net, Percentage"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateReconciliationOtherAdjustments",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized": {
     "auth_ref": [
      "r413"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cost not yet recognized for nonvested award under share-based payment arrangement.",
        "label": "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total",
        "terseLabel": "Unrecognized compensation expense related to stock compensation plans"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1": {
     "auth_ref": [
      "r413"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition",
        "terseLabel": "Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_EmployeeStockOptionMember": {
     "auth_ref": [
      "r411"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.",
        "label": "Share-based Payment Arrangement, Option [Member]",
        "terseLabel": "Employee Stock Option [Member]"
       }
      }
     },
     "localname": "EmployeeStockOptionMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense": {
     "auth_ref": [
      "r426"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of plan compensation cost recognized during the period.",
        "label": "Employee Stock Ownership Plan (ESOP), Compensation Expense",
        "terseLabel": "Compensation Expense"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPDeferredSharesFairValue": {
     "auth_ref": [
      "r428"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of unearned shares held by the employee stock ownership plan (ESOP).",
        "label": "Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value",
        "terseLabel": "Fair value of unallocated shares (based on $10.99 and $9.96 share price as of December 31, 2021 and December 31, 2020, respectively)"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPDeferredSharesFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares": {
     "auth_ref": [
      "r427"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.",
        "label": "Employee Stock Ownership Plan (ESOP), Number of Allocated Shares",
        "terseLabel": "Total allocated shares"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares": {
     "auth_ref": [
      "r427"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service.",
        "label": "Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares",
        "terseLabel": "ESOP shares committed to be released"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP": {
     "auth_ref": [
      "r425"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.",
        "label": "Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP",
        "terseLabel": "ESOP Purchased"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPSharesContributedToESOP",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP": {
     "auth_ref": [
      "r427"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.",
        "label": "Employee Stock Ownership Plan (ESOP), Shares in ESOP",
        "terseLabel": "Total ESOP shares"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPSharesInESOP",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average purchase price of capital shares purchased through an employee stock ownership plan.",
        "label": "Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased",
        "terseLabel": "Employee stock ownership plan weighted average price of shares purchased"
       }
      }
     },
     "localname": "EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EquipmentExpense": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 25.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.",
        "label": "Equipment Expense",
        "terseLabel": "Occupancy and equipment"
       }
      }
     },
     "localname": "EquipmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r0",
      "r57",
      "r58",
      "r59",
      "r114",
      "r115",
      "r116",
      "r118",
      "r125",
      "r128",
      "r147",
      "r238",
      "r335",
      "r336",
      "r416",
      "r417",
      "r418",
      "r454",
      "r455",
      "r491",
      "r512",
      "r513",
      "r514",
      "r515",
      "r516",
      "r518",
      "r695",
      "r696",
      "r697",
      "r775"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
        "label": "Equity Component [Domain]"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquitySecuritiesFvNi": {
     "auth_ref": [
      "r505"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 27.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.",
        "label": "Marketable equity securities, stated at fair value",
        "terseLabel": "Marketable equity securities, stated at fair value"
       }
      }
     },
     "localname": "EquitySecuritiesFvNi",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EquitySecuritiesFvNiRealizedGainLoss": {
     "auth_ref": [
      "r234",
      "r683"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 35.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
        "label": "Equity Securities, FV-NI, Realized Gain (Loss)",
        "negatedLabel": "Net change in fair value of marketable equity securities"
       }
      }
     },
     "localname": "EquitySecuritiesFvNiRealizedGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "auth_ref": [
      "r494",
      "r495",
      "r496",
      "r502"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
        "label": "Fair Value Measurements, Recurring and Nonrecurring [Table]",
        "terseLabel": "Fair Value Measurements, Recurring and Nonrecurring [Table]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique used to measure similar asset in prior period by class of asset or liability on non-recurring basis.",
        "label": "Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]",
        "terseLabel": "Schedule of Quantitative Information about Nonrecurring Level 3 Fair Value Measurements"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock": {
     "auth_ref": [
      "r494",
      "r495"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
        "label": "Fair Value, Assets Measured on Recurring Basis [Table Text Block]",
        "terseLabel": "Summary of Assets Measured at Fair Value on a Recurring Basis"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain": {
     "auth_ref": [
      "r500"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Class of asset.",
        "label": "Asset Class [Domain]",
        "terseLabel": "Asset Class [Domain]"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueByAssetClassAxis": {
     "auth_ref": [
      "r494",
      "r502"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by class of asset.",
        "label": "Asset Class [Axis]",
        "terseLabel": "Asset Class [Axis]"
       }
      }
     },
     "localname": "FairValueByAssetClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTextBlock": {
     "auth_ref": [
      "r494",
      "r508"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
        "label": "Fair Value, by Balance Sheet Grouping [Table Text Block]",
        "terseLabel": "Summary of Carrying Values and Estimated Fair Values of Financial Instruments"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r315",
      "r324",
      "r325",
      "r355",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362",
      "r371",
      "r495",
      "r540",
      "r541",
      "r542"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
        "label": "Fair Value Hierarchy and NAV [Axis]",
        "terseLabel": "Fair Value Hierarchy and NAV [Axis]"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementBasisAxis": {
     "auth_ref": [
      "r315",
      "r324",
      "r325",
      "r494",
      "r503"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by measurement basis.",
        "label": "Measurement Basis [Axis]"
       }
      }
     },
     "localname": "FairValueByMeasurementBasisAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r494",
      "r495",
      "r498",
      "r499",
      "r504"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by measurement frequency.",
        "label": "Measurement Frequency [Axis]",
        "terseLabel": "Measurement Frequency [Axis]"
       }
      }
     },
     "localname": "FairValueByMeasurementFrequencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability": {
     "auth_ref": [
      "r507"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.",
        "label": "Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability",
        "terseLabel": "Fixed Rate"
       }
      }
     },
     "localname": "FairValueDisclosureOffbalanceSheetRisksAmountLiability",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "localname": "FairValueDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresTextBlock": {
     "auth_ref": [
      "r501"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.",
        "label": "Fair Value Disclosures [Text Block]",
        "terseLabel": "Fair Value"
       }
      }
     },
     "localname": "FairValueDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValue"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r315",
      "r355",
      "r357",
      "r362",
      "r371",
      "r495",
      "r540"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
        "label": "Fair Value, Inputs, Level 1 [Member]",
        "terseLabel": "Fair Value, Inputs, Level 1 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r315",
      "r324",
      "r325",
      "r355",
      "r357",
      "r362",
      "r371",
      "r495",
      "r541"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
        "label": "Fair Value, Inputs, Level 2 [Member]",
        "terseLabel": "Fair Value, Inputs, Level 2 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r315",
      "r324",
      "r325",
      "r355",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362",
      "r371",
      "r495",
      "r542"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Inputs, Level 3 [Member]",
        "terseLabel": "Fair Value, Inputs, Level 3 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Measurement frequency.",
        "label": "Fair Value, Measurement Frequency [Domain]",
        "terseLabel": "Fair Value, Measurement Frequency [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementFrequencyDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [
      "r315",
      "r324",
      "r325",
      "r355",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362",
      "r371",
      "r540",
      "r541",
      "r542"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
        "label": "Fair Value Hierarchy and NAV [Domain]",
        "terseLabel": "Fair Value Hierarchy and NAV [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "auth_ref": [
      "r501",
      "r504"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Frequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.",
        "label": "Fair Value, Measurements, Recurring [Member]",
        "terseLabel": "Fair Value, Measurements, Recurring [Member]"
       }
      }
     },
     "localname": "FairValueMeasurementsRecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]",
        "terseLabel": "Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]"
       }
      }
     },
     "localname": "FairValueOffBalanceSheetRisksDisclosureInformationLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalDepositInsuranceCorporationPremiumExpense": {
     "auth_ref": [
      "r636"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 26.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.",
        "label": "Federal Deposit Insurance Corporation Premium Expense",
        "terseLabel": "FDIC assessment"
       }
      }
     },
     "localname": "FederalDepositInsuranceCorporationPremiumExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalFundsEffectiveSwapRateMember": {
     "auth_ref": [
      "r487"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fixed rate on U.S. dollar, constant-notional interest rate swap having its variable-rate leg referenced to Federal Funds effective rate with no additional spread over Federal Funds effective rate on that variable-rate leg.",
        "label": "Fed Funds Effective Rate Overnight Index Swap Rate [Member]"
       }
      }
     },
     "localname": "FederalFundsEffectiveSwapRateMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FederalFundsSold": {
     "auth_ref": [
      "r619"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 17.0,
       "parentTag": "us-gaap_CashCashEquivalentsAndFederalFundsSold",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.",
        "label": "Federal Funds Sold",
        "terseLabel": "Fed funds sold"
       }
      }
     },
     "localname": "FederalFundsSold",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds": {
     "auth_ref": [
      "r32",
      "r616",
      "r659"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).",
        "label": "Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds",
        "terseLabel": "Available and unused funds under borrowing agreement"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances, Interest Rate",
        "terseLabel": "FHLB advances, interest rate"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Federal Home Loan Bank, Advances [Line Items]"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate": {
     "auth_ref": [
      "r294",
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": 6.0,
       "parentTag": "us-gaap_AdvancesFromFederalHomeLoanBanks",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advance from Federal Home Loan Bank (FHLBank) maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, Due after Year Five",
        "terseLabel": "Thereafter"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate": {
     "auth_ref": [
      "r294",
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_AdvancesFromFederalHomeLoanBanks",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advance from Federal Home Loan Bank (FHLBank) maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Five",
        "terseLabel": "2026"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate": {
     "auth_ref": [
      "r294",
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_AdvancesFromFederalHomeLoanBanks",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advance from Federal Home Loan Bank (FHLBank) maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate": {
     "auth_ref": [
      "r294",
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_AdvancesFromFederalHomeLoanBanks",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advance from Federal Home Loan Bank (FHLBank) maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four",
        "terseLabel": "2025"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate": {
     "auth_ref": [
      "r294",
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_AdvancesFromFederalHomeLoanBanks",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advance from Federal Home Loan Bank (FHLBank) maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate": {
     "auth_ref": [
      "r294",
      "r659"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_AdvancesFromFederalHomeLoanBanks",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of advance from Federal Home Loan Bank (FHLBank) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Federal Home Loan Bank, Advance, Maturity, Year One",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturityRollingYearParValueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Federal Home Loan Bank, Advances, Maturity, Rolling Year, Par Value [Abstract]",
        "terseLabel": "Federal Home Loan Bank Advances Maturity Rolling Year Par Value [Abstract]"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturityRollingYearParValueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesTable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances [Table]"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsSummaryOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances [Table Text Block]",
        "terseLabel": "Summary of Federal Home Loan Bank Advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesTextBlock": {
     "auth_ref": [
      "r670"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure of advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances [Text Block]",
        "terseLabel": "FHLB Advances and Other Borrowings"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowings"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingAfterRollingYearFive": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five",
        "terseLabel": "Thereafter"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingAfterRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInNextTwelveRollingMonths": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next Twelve Rolling Months",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInNextTwelveRollingMonths",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFive": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five",
        "terseLabel": "2026"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFour": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four",
        "terseLabel": "2025"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFour",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearThree": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average interest rate on advances made and reported by Federal Home Loan Bank maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearThree",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearTwo": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsScheduleOfMaturitiesOfFederalHomeLoanBankAdvancesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankStock": {
     "auth_ref": [
      "r654"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 21.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).",
        "label": "Federal Home Loan Bank Stock",
        "positiveLabel": "Federal Home Loan Bank (FHLB) stock, at cost",
        "terseLabel": "FHLB stock",
        "verboseLabel": "Federal Home Loan Bank stock held"
       }
      }
     },
     "localname": "FederalHomeLoanBankStock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail",
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBanksAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Federal Home Loan Banks [Abstract]"
       }
      }
     },
     "localname": "FederalHomeLoanBanksAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalReserveBankAdvancesMember": {
     "auth_ref": [
      "r616"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Borrowings from the Federal Reserve Bank, which are primarily used to cover shortages in the required reserve balance and also in times of liquidity shortages.",
        "label": "Federal Reserve Bank Advances [Member]"
       }
      }
     },
     "localname": "FederalReserveBankAdvancesMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinanceLoanAndLeaseReceivablesHeldForSalePolicy": {
     "auth_ref": [
      "r174",
      "r189",
      "r197",
      "r207"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for financing receivables classified as held-for-sale.",
        "label": "Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block]",
        "verboseLabel": "Loans Held for Sale"
       }
      }
     },
     "localname": "FinanceLoanAndLeaseReceivablesHeldForSalePolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FinancialInstrumentAxis": {
     "auth_ref": [
      "r222",
      "r223",
      "r231",
      "r232",
      "r233",
      "r242",
      "r245",
      "r246",
      "r249",
      "r252",
      "r265",
      "r267",
      "r268",
      "r269",
      "r323",
      "r334",
      "r489",
      "r537",
      "r538",
      "r539",
      "r540",
      "r541",
      "r542",
      "r544",
      "r545",
      "r546",
      "r551",
      "r552",
      "r553",
      "r554",
      "r557",
      "r561",
      "r569",
      "r570",
      "r571",
      "r572",
      "r576",
      "r577",
      "r578",
      "r579",
      "r580",
      "r581",
      "r582",
      "r583",
      "r585",
      "r586",
      "r587",
      "r740",
      "r741",
      "r742",
      "r743",
      "r744",
      "r745",
      "r746"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of financial instrument.",
        "label": "Financial Instrument [Axis]",
        "terseLabel": "Financial Instrument [Axis]"
       }
      }
     },
     "localname": "FinancialInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancialInstrumentPerformanceStatusAxis": {
     "auth_ref": [
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by category of performance or non-performance status of financial instruments.",
        "label": "Financial Instrument Performance Status [Axis]",
        "terseLabel": "Financial Instrument Performance Status [Axis]"
       }
      }
     },
     "localname": "FinancialInstrumentPerformanceStatusAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancialInstrumentPerformanceStatusDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Category of performance or non-performance status of financial instruments, including but not limited to, financing receivables, loans, debt, and investments.",
        "label": "Financial Instrument Performance Status [Domain]",
        "terseLabel": "Financial Instrument Performance Status [Domain]"
       }
      }
     },
     "localname": "FinancialInstrumentPerformanceStatusDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancialSupportToNonconsolidatedLegalEntityAxis": {
     "auth_ref": [
      "r469",
      "r706"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by financial support arrangement provided to a nonconsolidated legal entity that is required to comply with or operate in accordance with requirements that are similar to those included in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds.",
        "label": "Financial Support to Nonconsolidated Legal Entity [Axis]",
        "terseLabel": "Financial Support to Nonconsolidated Legal Entity [Axis]"
       }
      }
     },
     "localname": "FinancialSupportToNonconsolidatedLegalEntityAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancialSupportToNonconsolidatedLegalEntityDomain": {
     "auth_ref": [
      "r469",
      "r706"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Financial support arrangement provided to a nonconsolidated legal entity that is required to comply with or operate in accordance with requirements that are similar to those included in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds.",
        "label": "Financial Support to Nonconsolidated Legal Entity [Domain]",
        "terseLabel": "Financial Support to Nonconsolidated Legal Entity [Domain]"
       }
      }
     },
     "localname": "FinancialSupportToNonconsolidatedLegalEntityDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment": {
     "auth_ref": [
      "r179"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_LoansAndLeasesReceivableAllowance",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.",
        "label": "Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment",
        "terseLabel": "Collectively evaluated for impairment"
       }
      }
     },
     "localname": "FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery": {
     "auth_ref": [
      "r178",
      "r244",
      "r260"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase in allowance for credit loss on financing receivable from recovery.",
        "label": "Financing Receivable, Allowance for Credit Losses, Recovery",
        "verboseLabel": "Recoveries of loans previously charged off"
       }
      }
     },
     "localname": "FinancingReceivableAllowanceForCreditLossesRecovery",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs": {
     "auth_ref": [
      "r177",
      "r243",
      "r260"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of writeoff of financing receivable, charged against allowance for credit loss.",
        "label": "Financing Receivable, Allowance for Credit Losses, Write-downs",
        "negatedLabel": "Loans charged-off"
       }
      }
     },
     "localname": "FinancingReceivableAllowanceForCreditLossesWriteOffs",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment": {
     "auth_ref": [
      "r180"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_NotesReceivableNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The balance of financing receivables that were collectively evaluated for impairment.",
        "label": "Financing Receivable, Collectively Evaluated for Impairment",
        "terseLabel": "Collectively evaluated for impairment"
       }
      }
     },
     "localname": "FinancingReceivableCollectivelyEvaluatedForImpairment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.",
        "label": "Financing Receivable Credit Quality Indicators [Table Text Block]",
        "terseLabel": "Summary of Information Regarding the Credit Quality Indicators for Residential Real Estate and Consumer Loans"
       }
      }
     },
     "localname": "FinancingReceivableCreditQualityIndicatorsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FinancingReceivableImpairedLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Financing Receivable, Impaired [Line Items]",
        "terseLabel": "Financing Receivable, Impaired [Line Items]"
       }
      }
     },
     "localname": "FinancingReceivableImpairedLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment": {
     "auth_ref": [
      "r180"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_NotesReceivableNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The balance of financing receivables that were individually evaluated for impairment.",
        "label": "Financing Receivable, Individually Evaluated for Impairment",
        "terseLabel": "Individually evaluated for impairment"
       }
      }
     },
     "localname": "FinancingReceivableIndividuallyEvaluatedForImpairment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableModificationsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Financing Receivable, Modifications [Line Items]"
       }
      }
     },
     "localname": "FinancingReceivableModificationsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2": {
     "auth_ref": [
      "r192"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, after troubled debt restructuring, of modified financing receivable.",
        "label": "Financing Receivable, Modifications, Post-Modification Recorded Investment",
        "terseLabel": "Loans modified as troubled debt restructurings"
       }
      }
     },
     "localname": "FinancingReceivableModificationsPostModificationRecordedInvestment2",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableModificationsRecordedInvestment": {
     "auth_ref": [
      "r192",
      "r209"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of financing receivable modified as troubled debt restructuring.",
        "label": "Financing Receivable, Modifications, Recorded Investment",
        "presentationGuidance": "Troubled debt restructurings"
       }
      }
     },
     "localname": "FinancingReceivableModificationsRecordedInvestment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1": {
     "auth_ref": [
      "r193"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.",
        "label": "Financing Receivable, Modifications, Subsequent Default, Recorded Investment",
        "terseLabel": "Troubled debt restructurings within past twelve months for which there was a default"
       }
      }
     },
     "localname": "FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivablePortfolioSegmentAxis": {
     "auth_ref": [
      "r242",
      "r245",
      "r253",
      "r740",
      "r741",
      "r742",
      "r743",
      "r744",
      "r745",
      "r746",
      "r748",
      "r749",
      "r750",
      "r751",
      "r752",
      "r753",
      "r754"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by the level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses.",
        "label": "Financing Receivable Portfolio Segment [Axis]",
        "terseLabel": "Financing Receivable Portfolio Segment [Axis]"
       }
      }
     },
     "localname": "FinancingReceivablePortfolioSegmentAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivablePortfolioSegmentDomain": {
     "auth_ref": [
      "r740",
      "r741",
      "r742",
      "r743",
      "r744",
      "r745",
      "r746",
      "r748",
      "r749",
      "r750",
      "r751",
      "r752",
      "r753",
      "r754"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses.",
        "label": "Financing Receivable Portfolio Segment [Domain]",
        "terseLabel": "Financing Receivable Portfolio Segment [Domain]"
       }
      }
     },
     "localname": "FinancingReceivablePortfolioSegmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing": {
     "auth_ref": [
      "r199",
      "r248",
      "r261"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of financing receivable 90 days or more past due and still accruing.",
        "label": "Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing",
        "terseLabel": "Loans 90 days or more past due and accruing interest"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis": {
     "auth_ref": [
      "r191",
      "r200",
      "r201",
      "r246",
      "r249",
      "r252",
      "r254",
      "r255",
      "r260",
      "r261",
      "r740",
      "r741",
      "r742",
      "r743",
      "r744",
      "r745",
      "r746",
      "r748",
      "r749",
      "r750",
      "r751",
      "r752",
      "r753",
      "r754"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by class of financing receivable determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.",
        "label": "Class of Financing Receivable, Type [Axis]",
        "terseLabel": "Class of Financing Receivable, Type [Axis]"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain": {
     "auth_ref": [
      "r740",
      "r741",
      "r742",
      "r743",
      "r744",
      "r745",
      "r746",
      "r748",
      "r749",
      "r750",
      "r751",
      "r752",
      "r753",
      "r754"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Financing receivables determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.",
        "label": "Class of Financing Receivable, Type [Domain]",
        "terseLabel": "Class of Financing Receivable, Type [Domain]"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Financing Receivable, Recorded Investment [Line Items]",
        "terseLabel": "Financing Receivable, Recorded Investment [Line Items]"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus": {
     "auth_ref": [
      "r198",
      "r247",
      "r751",
      "r752"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of financing receivable on nonaccrual status.",
        "label": "Financing Receivable, Recorded Investment, Nonaccrual Status",
        "totalLabel": "Total nonperforming loans (NPLs)",
        "verboseLabel": "Nonaccrual Loans"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentNonaccrualStatus",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableThresholdPeriodPastDue": {
     "auth_ref": [
      "r246"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Threshold period for when financing receivable is considered past due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes threshold period past due to write off as uncollectible.",
        "label": "Financing Receivable, Threshold Period Past Due",
        "terseLabel": "Financing recievable threshold past due"
       }
      }
     },
     "localname": "FinancingReceivableThresholdPeriodPastDue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember": {
     "auth_ref": [
      "r261"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Financial asset equal to or greater than 90 days past due.",
        "label": "Financing Receivables, Equal to Greater than 90 Days Past Due [Member]",
        "terseLabel": "Loans Past Due 90+ Days [Member]"
       }
      }
     },
     "localname": "FinancingReceivablesEqualToGreaterThan90DaysPastDueMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivablesPeriodPastDueAxis": {
     "auth_ref": [
      "r201",
      "r246",
      "r261"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by period in which financial asset is past due or not past due.",
        "label": "Financing Receivables, Period Past Due [Axis]",
        "terseLabel": "Financing Receivables, Period Past Due [Axis]"
       }
      }
     },
     "localname": "FinancingReceivablesPeriodPastDueAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivablesPeriodPastDueDomain": {
     "auth_ref": [
      "r201",
      "r246",
      "r261"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Period in which financial asset is past due or not past due. For past due, element name and standard label in Financial Asset, [numeric lower end] to [numeric higher end] [date measure] Past Due [Member] or Financial Asset, Greater than [low end numeric value] [date measure] Past Due [Member] or Financial Asset, Less than [high end numeric value] [date measure] Past Due [Member] formats.",
        "label": "Financing Receivables, Period Past Due [Domain]",
        "terseLabel": "Financing Receivables, Period Past Due [Domain]"
       }
      }
     },
     "localname": "FinancingReceivablesPeriodPastDueDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, after Year Five",
        "terseLabel": "Thereafter"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths": {
     "auth_ref": [
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finite-Lived Intangible Asset, Expected Amortization, Year One",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive": {
     "auth_ref": [
      "r272"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Five",
        "terseLabel": "2026"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearFive",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour": {
     "auth_ref": [
      "r272"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Four",
        "terseLabel": "2025"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearFour",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree": {
     "auth_ref": [
      "r272"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Three",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearThree",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo": {
     "auth_ref": [
      "r272"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Two",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]",
        "verboseLabel": "Finite Lived Intangible Assets Future Amortization Expense [Abstract]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsNet": {
     "auth_ref": [
      "r271",
      "r591"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
        "label": "Finite-Lived Intangible Assets, Net",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfEstimatedFutureAmortizationExpenseForMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FirstMortgageMember": {
     "auth_ref": [
      "r725"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan secured by real property that has a first (highest) lien on such property in the event of default by the borrower.",
        "label": "First Mortgage [Member]",
        "terseLabel": "First Mortgage [Member]"
       }
      }
     },
     "localname": "FirstMortgageMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ForeclosedAssets": {
     "auth_ref": [
      "r172",
      "r173"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.",
        "label": "Repossessed Assets",
        "terseLabel": "Foreclosed assets"
       }
      }
     },
     "localname": "ForeclosedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnSaleOfInvestments": {
     "auth_ref": [
      "r90"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 17.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.",
        "label": "Gain (Loss) on Sale of Investments",
        "terseLabel": "Net gain on sale of securities"
       }
      }
     },
     "localname": "GainLossOnSaleOfInvestments",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnSaleOfMortgageLoans": {
     "auth_ref": [
      "r90",
      "r688",
      "r689",
      "r690"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 33.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.",
        "label": "Gain (Loss) on Sale of Mortgage Loans",
        "negatedLabel": "Net gain on sale of mortgage loans held for sale"
       }
      }
     },
     "localname": "GainLossOnSaleOfMortgageLoans",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": {
     "auth_ref": [
      "r90"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 23.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.",
        "label": "Gain (Loss) on Disposition of Property Plant Equipment",
        "negatedLabel": "Net loss on disposal of premises and equipment"
       }
      }
     },
     "localname": "GainLossOnSaleOfPropertyPlantEquipment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnSalesOfLoansNet": {
     "auth_ref": [
      "r90",
      "r634",
      "r687"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 16.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.",
        "label": "Gain (Loss) on Sales of Loans, Net",
        "verboseLabel": "Net gain on sale of loans"
       }
      }
     },
     "localname": "GainLossOnSalesOfLoansNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment": {
     "auth_ref": [
      "r185",
      "r188"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.",
        "label": "Impaired Financing Receivable, Average Recorded Investment",
        "terseLabel": "Average Investment"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableAverageRecordedInvestment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod": {
     "auth_ref": [
      "r186"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.",
        "label": "Impaired Financing Receivable, Interest Income, Accrual Method",
        "terseLabel": "Interest Recognized"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableInterestIncomeAccrualMethod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableRecordedInvestment": {
     "auth_ref": [
      "r182"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.",
        "label": "Impaired Financing Receivable, Recorded Investment",
        "terseLabel": "Recorded Investment"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableRecordedInvestment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableRelatedAllowance": {
     "auth_ref": [
      "r183"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of allowance for credit losses related to recorded investment.",
        "label": "Impaired Financing Receivable, Related Allowance",
        "terseLabel": "Reserve",
        "verboseLabel": "Valuation allowance against impaired loans"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableRelatedAllowance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment": {
     "auth_ref": [
      "r185",
      "r188"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.",
        "label": "Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment",
        "terseLabel": "Average Investment"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod": {
     "auth_ref": [
      "r186"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.",
        "label": "Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method",
        "terseLabel": "Interest Recognized"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment": {
     "auth_ref": [
      "r182"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.",
        "label": "Impaired Financing Receivable, with No Related Allowance, Recorded Investment",
        "terseLabel": "Recorded Investment"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance": {
     "auth_ref": [
      "r184"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.",
        "label": "Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance",
        "terseLabel": "Principal Balance"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment": {
     "auth_ref": [
      "r182"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.",
        "label": "Impaired Financing Receivable, with Related Allowance, Recorded Investment",
        "terseLabel": "Recorded Investment"
       }
      }
     },
     "localname": "ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairedFinancingReceivablesTableTextBlock": {
     "auth_ref": [
      "r187"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of impaired financing receivables.",
        "label": "Impaired Financing Receivables [Table Text Block]",
        "terseLabel": "Summary of Information Regarding Impaired Loans"
       }
      }
     },
     "localname": "ImpairedFinancingReceivablesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": {
     "auth_ref": [
      "r63",
      "r161",
      "r162",
      "r165",
      "r166",
      "r168",
      "r604",
      "r624",
      "r644",
      "r685"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.",
        "label": "Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest",
        "totalLabel": "Income before income taxes"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeStatementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Income Statement [Abstract]"
       }
      }
     },
     "localname": "IncomeStatementAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxAuthorityAxis": {
     "auth_ref": [
      "r438"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by tax jurisdiction.",
        "label": "Income Tax Authority [Axis]"
       }
      }
     },
     "localname": "IncomeTaxAuthorityAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxAuthorityDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Agency, division or body classification that levies income taxes, examines tax returns for compliance, or grants exemptions from or makes other decisions pertaining to income taxes.",
        "label": "Income Tax Authority [Domain]"
       }
      }
     },
     "localname": "IncomeTaxAuthorityDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeTaxDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Income Tax Disclosure [Abstract]"
       }
      }
     },
     "localname": "IncomeTaxDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxDisclosureTextBlock": {
     "auth_ref": [
      "r106",
      "r437",
      "r439",
      "r445",
      "r456",
      "r462",
      "r466",
      "r467",
      "r468"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.",
        "label": "Income Tax Disclosure [Text Block]",
        "terseLabel": "Income Taxes"
       }
      }
     },
     "localname": "IncomeTaxDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r107",
      "r127",
      "r128",
      "r160",
      "r435",
      "r457",
      "r464",
      "r686"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Income Tax Expense (Benefit)",
        "terseLabel": "Income tax expense (benefit)",
        "totalLabel": "Total income tax expense (benefit), Amount",
        "verboseLabel": "Income (benefit) tax expense"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability": {
     "auth_ref": [
      "r452"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.",
        "label": "Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability",
        "verboseLabel": "Valuation allowance"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesProvisionForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Effective Income Tax Rate Reconciliation, Amount [Abstract]"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxPolicyTextBlock": {
     "auth_ref": [
      "r56",
      "r432",
      "r433",
      "r439",
      "r440",
      "r444",
      "r453"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.",
        "label": "Income Tax, Policy [Policy Text Block]",
        "verboseLabel": "Income Taxes"
       }
      }
     },
     "localname": "IncomeTaxPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance": {
     "auth_ref": [
      "r436"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.",
        "label": "Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount",
        "verboseLabel": "Change in valuation allowance, Amount"
       }
      }
     },
     "localname": "IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate": {
     "auth_ref": [
      "r436"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.",
        "label": "Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount",
        "verboseLabel": "Federal income taxes at statutory rate, Amount"
       }
      }
     },
     "localname": "IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxReconciliationOtherAdjustments": {
     "auth_ref": [
      "r436"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.",
        "label": "Effective Income Tax Rate Reconciliation, Other Adjustments, Amount",
        "verboseLabel": "Other net, Amount"
       }
      }
     },
     "localname": "IncomeTaxReconciliationOtherAdjustments",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxesPaidNet": {
     "auth_ref": [
      "r95"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.",
        "label": "Income Taxes Paid, Net",
        "terseLabel": "Cash received during the year for income taxes"
       }
      }
     },
     "localname": "IncomeTaxesPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase (decrease) in prepayments received from borrowers for taxes and insurance remitted to the appropriate tax authority or insurer on behalf of the borrower.",
        "label": "Increase (Decrease) in Advance Payments by Borrowers for Taxes and Insurance",
        "terseLabel": "Net (decrease) increase in advance payments by borrowers for taxes and insurance"
       }
      }
     },
     "localname": "IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInDeferredCharges": {
     "auth_ref": [
      "r89"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the value of expenditures made during the current reporting period for benefits that will be received over a period of years. Deferred charges differ from prepaid expenses in that they usually extend over a long period of time and may or may not be regularly recurring costs of operation.",
        "label": "Increase (Decrease) in Deferred Charges",
        "verboseLabel": "Charges to operations"
       }
      }
     },
     "localname": "IncreaseDecreaseInDeferredCharges",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInDeposits": {
     "auth_ref": [
      "r93",
      "r642"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.",
        "label": "Increase (Decrease) in Deposits",
        "verboseLabel": "Net increase in deposits"
       }
      }
     },
     "localname": "IncreaseDecreaseInDeposits",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInsuranceSettlementsReceivable": {
     "auth_ref": [
      "r89"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 39.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date.",
        "label": "Increase (Decrease) in Insurance Settlements Receivable",
        "negatedLabel": "Net change in cash value of life insurance"
       }
      }
     },
     "localname": "IncreaseDecreaseInInsuranceSettlementsReceivable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapital": {
     "auth_ref": [
      "r89"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.",
        "label": "Increase (Decrease) in Operating Capital",
        "terseLabel": "Increase in assets and liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapital",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Increase (Decrease) in Operating Capital [Abstract]",
        "terseLabel": "Changes in operating assets and liabilities:"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestAndDividendIncomeOperating": {
     "auth_ref": [
      "r630"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 5.0,
       "parentTag": "us-gaap_InterestIncomeExpenseNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.",
        "label": "Interest and Dividend Income, Operating",
        "totalLabel": "Total interest and dividend income"
       }
      }
     },
     "localname": "InterestAndDividendIncomeOperating",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestAndDividendIncomeOperatingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Interest and Dividend Income, Operating [Abstract]",
        "terseLabel": "Interest and dividend income:"
       }
      }
     },
     "localname": "InterestAndDividendIncomeOperatingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestAndFeeIncomeLoansAndLeases": {
     "auth_ref": [
      "r629"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 6.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.",
        "label": "Interest and Fee Income, Loans and Leases",
        "terseLabel": "Loans, including fees"
       }
      }
     },
     "localname": "InterestAndFeeIncomeLoansAndLeases",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDomesticDepositBrokered": {
     "auth_ref": [
      "r615"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.",
        "label": "Interest-bearing Domestic Deposit, Brokered",
        "terseLabel": "Brokered deposits"
       }
      }
     },
     "localname": "InterestBearingDomesticDepositBrokered",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits": {
     "auth_ref": [
      "r615"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_Deposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest-bearing domestic certificate of deposit liabilities.",
        "label": "Interest-bearing Domestic Deposit, Certificates of Deposits",
        "terseLabel": "Certificates of deposit"
       }
      }
     },
     "localname": "InterestBearingDomesticDepositCertificatesOfDeposits",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDomesticDepositDemand": {
     "auth_ref": [
      "r615"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_Deposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of money in interest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits.",
        "label": "Interest-bearing Domestic Deposit, Demand",
        "terseLabel": "Interest bearing checking"
       }
      }
     },
     "localname": "InterestBearingDomesticDepositDemand",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDomesticDepositMoneyMarket": {
     "auth_ref": [
      "r615"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_Deposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest-bearing domestic money market demand account deposit liabilities.",
        "label": "Interest-bearing Domestic Deposit, Money Market",
        "terseLabel": "Money market"
       }
      }
     },
     "localname": "InterestBearingDomesticDepositMoneyMarket",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDomesticDepositSavings": {
     "auth_ref": [
      "r615"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_Deposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity.",
        "label": "Interest-bearing Domestic Deposit, Savings",
        "terseLabel": "Statement savings"
       }
      }
     },
     "localname": "InterestBearingDomesticDepositSavings",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpense": {
     "auth_ref": [
      "r62",
      "r159",
      "r520",
      "r521",
      "r641"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 9.0,
       "parentTag": "us-gaap_InterestIncomeExpenseNet",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.",
        "label": "Interest Expense",
        "totalLabel": "Total interest expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Interest Expense [Abstract]",
        "verboseLabel": "Interest expense:"
       }
      }
     },
     "localname": "InterestExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestExpenseBorrowings": {
     "auth_ref": [
      "r640"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 11.0,
       "parentTag": "us-gaap_InterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Aggregate amount of interest expense on all borrowings.",
        "label": "Interest Expense, Borrowings",
        "terseLabel": "Borrowed funds"
       }
      }
     },
     "localname": "InterestExpenseBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseDeposits": {
     "auth_ref": [
      "r639"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 10.0,
       "parentTag": "us-gaap_InterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Aggregate amount of interest expense on all deposits.",
        "label": "Interest Expense, Deposits",
        "terseLabel": "Interest-bearing deposits",
        "verboseLabel": "Total"
       }
      }
     },
     "localname": "InterestExpenseDeposits",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/DepositsInterestExpenseOnDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit": {
     "auth_ref": [
      "r639"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest expense on domestic certificates of deposit liabilities.",
        "label": "Interest Expense Domestic Deposit Liabilities, Certificates of Deposit",
        "verboseLabel": "Certificates of deposit"
       }
      }
     },
     "localname": "InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsInterestExpenseOnDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseDomesticDepositLiabilitiesChecking": {
     "auth_ref": [
      "r639"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest expense on domestic checking deposit liabilities.",
        "label": "Interest Expense Domestic Deposit Liabilities, Checking",
        "verboseLabel": "Interest bearing checking"
       }
      }
     },
     "localname": "InterestExpenseDomesticDepositLiabilitiesChecking",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsInterestExpenseOnDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket": {
     "auth_ref": [
      "r639"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest expense on domestic money market demand account deposit liabilities.",
        "label": "Interest Expense Domestic Deposit Liabilities, Money Market",
        "verboseLabel": "Money market"
       }
      }
     },
     "localname": "InterestExpenseDomesticDepositLiabilitiesMoneyMarket",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsInterestExpenseOnDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings": {
     "auth_ref": [
      "r639"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest expense on domestic savings deposit liabilities.",
        "label": "Interest Expense Domestic Deposit Liabilities, Savings",
        "verboseLabel": "Statement savings"
       }
      }
     },
     "localname": "InterestExpenseDomesticDepositLiabilitiesSavings",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsInterestExpenseOnDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss": {
     "auth_ref": [
      "r633"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.",
        "label": "Interest Income (Expense), after Provision for Loan Loss",
        "totalLabel": "Net interest income after provision for loan losses"
       }
      }
     },
     "localname": "InterestIncomeExpenseAfterProvisionForLoanLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeExpenseNet": {
     "auth_ref": [
      "r631"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 4.0,
       "parentTag": "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The net amount of operating interest income (expense).",
        "label": "Interest Income (Expense), Net",
        "totalLabel": "Net interest income"
       }
      }
     },
     "localname": "InterestIncomeExpenseNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeSecuritiesTaxable": {
     "auth_ref": [
      "r637",
      "r740",
      "r741"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 7.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.",
        "label": "Interest Income, Securities, Operating, Taxable",
        "terseLabel": "Securities, taxable"
       }
      }
     },
     "localname": "InterestIncomeSecuritiesTaxable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPaidNet": {
     "auth_ref": [
      "r81",
      "r86",
      "r95"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.",
        "label": "Interest Paid, Excluding Capitalized Interest, Operating Activities",
        "terseLabel": "Cash paid during the year for interest"
       }
      }
     },
     "localname": "InterestPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPayableCurrentAndNoncurrent": {
     "auth_ref": [
      "r617",
      "r678"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 5.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of interest payable on debt, including, but not limited to, trade payables.",
        "label": "Interest Payable",
        "terseLabel": "Accrued interest payable"
       }
      }
     },
     "localname": "InterestPayableCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateLockCommitmentsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Commitments to extend credit where the interest rate is locked in advance of funds being disbursed for a specified period of time.",
        "label": "Interest Rate Lock Commitments [Member]"
       }
      }
     },
     "localname": "InterestRateLockCommitmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InterestReceivable": {
     "auth_ref": [
      "r38"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 24.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.",
        "label": "Interest Receivable",
        "terseLabel": "Accrued interest receivable"
       }
      }
     },
     "localname": "InterestReceivable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InternalCreditAssessmentAxis": {
     "auth_ref": [
      "r190",
      "r252",
      "r259",
      "r260",
      "r292",
      "r484"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by entity-defined rating.",
        "label": "Internal Credit Assessment [Axis]",
        "terseLabel": "Internal Credit Assessment [Axis]"
       }
      }
     },
     "localname": "InternalCreditAssessmentAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InternalCreditAssessmentDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Entity defined credit risk rating.",
        "label": "Internal Credit Assessment [Domain]",
        "terseLabel": "Internal Credit Assessment [Domain]"
       }
      }
     },
     "localname": "InternalCreditAssessmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InvestmentTypeAxis": {
     "auth_ref": [
      "r707",
      "r708",
      "r709",
      "r710",
      "r711",
      "r712",
      "r713",
      "r714",
      "r715",
      "r716",
      "r717",
      "r718",
      "r719",
      "r720",
      "r721"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of investments.",
        "label": "Investment Type [Axis]",
        "terseLabel": "Investment Type [Axis]"
       }
      }
     },
     "localname": "InvestmentTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentTypeCategorizationMember": {
     "auth_ref": [
      "r707",
      "r708",
      "r709",
      "r710",
      "r711",
      "r712",
      "r713",
      "r714",
      "r715",
      "r716",
      "r717",
      "r718",
      "r719",
      "r720",
      "r721"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Asset obtained to generate income or appreciate in value.",
        "label": "Investments [Domain]",
        "terseLabel": "Investments [Domain]"
       }
      }
     },
     "localname": "InvestmentTypeCategorizationMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.",
        "label": "Investments Classified by Contractual Maturity Date [Table Text Block]",
        "terseLabel": "Summary of Amortized Costs and Fair Values of Securities Available-for-sale, by Contractual Maturity"
       }
      }
     },
     "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Investments, Debt and Equity Securities [Abstract]",
        "terseLabel": "Investments Debt And Equity Securities [Abstract]",
        "verboseLabel": "Investments Debt And Equity Securities [Abstract]"
       }
      }
     },
     "localname": "InvestmentsDebtAndEquitySecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock": {
     "auth_ref": [
      "r230",
      "r605",
      "r653",
      "r722",
      "r747"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for  investments in certain debt and equity securities.",
        "label": "Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]",
        "verboseLabel": "Available for Sale Securities"
       }
      }
     },
     "localname": "InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecurities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LaborAndRelatedExpense": {
     "auth_ref": [
      "r69"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 22.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.",
        "label": "Labor and Related Expense",
        "terseLabel": "Salaries and employee benefits"
       }
      }
     },
     "localname": "LaborAndRelatedExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LandMember": {
     "auth_ref": [
      "r349"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Part of earth's surface not covered by water.",
        "label": "Land [Member]",
        "terseLabel": "Land [Member]"
       }
      }
     },
     "localname": "LandMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LesseeDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Lessee Disclosure [Abstract]"
       }
      }
     },
     "localname": "LesseeDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock": {
     "auth_ref": [
      "r523"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.",
        "label": "Lessee, Operating Lease, Liability, Maturity [Table Text Block]",
        "terseLabel": "Summary of Rent commitments Before Considering Renewal Options"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r523"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease.",
        "label": "Lessee, Operating Lease, Liability, to be Paid",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths": {
     "auth_ref": [
      "r523"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Lessee, Operating Lease, Liability, to be Paid, Year One",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r523"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Lessee, Operating Lease, Liability, to be Paid, Year Four",
        "terseLabel": "Thereafter"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r523"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Lessee, Operating Lease, Liability, to be Paid, Year Three",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r523"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Lessee, Operating Lease, Liability, to be Paid, Year Two",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfRentCommitmentsBeforeConsideringRenewalOptionsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r31",
      "r104",
      "r164",
      "r235",
      "r295",
      "r296",
      "r297",
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r474",
      "r479",
      "r480",
      "r510",
      "r533",
      "r534"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
        "label": "Liabilities",
        "totalLabel": "TOTAL LIABILITIES"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Liabilities [Abstract]",
        "terseLabel": "Financial liabilities:"
       }
      }
     },
     "localname": "LiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "auth_ref": [
      "r22",
      "r104",
      "r235",
      "r510",
      "r535",
      "r611",
      "r676"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
        "label": "Liabilities and Equity",
        "totalLabel": "TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Liabilities and Equity [Abstract]",
        "verboseLabel": "Liabilities and Stockholders' Equity"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LifeSettlementContractsPolicy": {
     "auth_ref": [
      "r236",
      "r237"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for life settlement contracts including the classification of cash receipts and cash disbursements in the statement of cash flows.",
        "label": "Life Settlement Contracts, Policy [Policy Text Block]",
        "verboseLabel": "Cash value of life insurance"
       }
      }
     },
     "localname": "LifeSettlementContractsPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LineOfCredit": {
     "auth_ref": [
      "r12",
      "r610",
      "r671"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
        "label": "Long-term Line of Credit",
        "verboseLabel": "Federal funds rate line of credit"
       }
      }
     },
     "localname": "LineOfCredit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityAxis": {
     "auth_ref": [
      "r29",
      "r103"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by name of lender, which may be a single entity (for example, but not limited to, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit.",
        "label": "Lender Name [Axis]"
       }
      }
     },
     "localname": "LineOfCreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditFacilityLenderDomain": {
     "auth_ref": [
      "r29",
      "r103"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Identification of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility.",
        "label": "Line of Credit Facility, Lender [Domain]"
       }
      }
     },
     "localname": "LineOfCreditFacilityLenderDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity": {
     "auth_ref": [
      "r29"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity",
        "terseLabel": "Available Borrowing Capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityRemainingBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoanCommitmentsPolicy": {
     "auth_ref": [
      "r485",
      "r486"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for loan commitments accounted for as derivatives, including the methods and assumptions used to estimate fair value and any associated hedging strategies.",
        "label": "Loan Commitments, Policy [Policy Text Block]",
        "verboseLabel": "Rate Lock Commitments"
       }
      }
     },
     "localname": "LoanCommitmentsPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LoanOriginationCommitmentsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Commitments to borrowers or third party investors for the origination of a loan.",
        "label": "Loan Origination Commitments [Member]",
        "terseLabel": "Commitments to Sell Loans [Member]"
       }
      }
     },
     "localname": "LoanOriginationCommitmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LoanProcessingFee": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 24.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Expenses paid for obtaining loans which includes expenses such as application and origination fees.",
        "label": "Loan Processing Fee",
        "terseLabel": "Data processing"
       }
      }
     },
     "localname": "LoanProcessingFee",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoanRestructuringModificationAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by concessions made to the terms of loan contracts.",
        "label": "Loan Restructuring Modification [Axis]"
       }
      }
     },
     "localname": "LoanRestructuringModificationAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LoanRestructuringModificationDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Concessions made to the terms of loan contracts, including but not limited to, interest rate reductions, maturity extensions, principal forgiveness, and payment deferral.",
        "label": "Loan Restructuring Modification [Domain]"
       }
      }
     },
     "localname": "LoanRestructuringModificationDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LoansAndLeasesReceivableAllowance": {
     "auth_ref": [
      "r175",
      "r179",
      "r204",
      "r208"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.",
        "label": "Loans and Leases Receivable, Allowance",
        "negatedLabel": "Allowance for loan losses",
        "periodEndLabel": "Ending balance",
        "periodStartLabel": "Beginning balance",
        "totalLabel": "Total allowance for loan losses"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableAllowance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableAllowanceForLoanLossesPolicy": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for estimating the allowance for losses on loans and lease receivables. The disclosure may include (a) how the entity determines each element of the allowance, (b) which loans are evaluated individually and which loans are evaluated as a group, (c) how the entity determines both the allocated and unallocated portions of the allowance, (d) how the entity determines the loss factors applied to graded loans in order to develop a general allowance, and (e) what self-correcting mechanism the entity uses to reduce differences between estimated and actual losses.",
        "label": "Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]",
        "verboseLabel": "Allowance for Loan Losses"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableAllowanceForLoanLossesPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LoansAndLeasesReceivableDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Loans and Leases Receivable Disclosure [Abstract]"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LoansAndLeasesReceivableDisclosureLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Loans and Leases Receivable Disclosure [Line Items]",
        "terseLabel": "Loans and Leases Receivable Disclosure [Line Items]"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableDisclosureLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LoansAndLeasesReceivableDisclosureTable": {
     "auth_ref": [
      "r171"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about loans and leases receivable.",
        "label": "Loans and Leases Receivable Disclosure [Table]",
        "terseLabel": "Loans and Leases Receivable Disclosure [Table]"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableDisclosureTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LoansAndLeasesReceivableGrossCarryingAmount": {
     "auth_ref": [
      "r171"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "definitionGuidance": "Total Loans",
        "documentation": "Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.",
        "label": "Loans and Leases Receivable, Gross",
        "positiveLabel": "Loans, gross",
        "terseLabel": "Additional Loans Receivable",
        "verboseLabel": "Loans and leases receivable gross carrying amount"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableGrossCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableLoansInProcess": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.",
        "label": "Loans and Leases Receivable, Loans in Process",
        "terseLabel": "Forgiven Loans in process"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableLoansInProcess",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableMortgageBankingActivitiesPolicy": {
     "auth_ref": [
      "r724"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for the lending, securitization, sales, transfers and servicing practices for mortgage banking activities.",
        "label": "Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block]",
        "verboseLabel": "Mortgage Servicing Rights"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableMortgageBankingActivitiesPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LoansAndLeasesReceivableNetReportedAmount": {
     "auth_ref": [
      "r171",
      "r622"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 20.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.",
        "label": "Loans and Leases Receivable, Net Amount",
        "presentationGuidance": "Loans, net",
        "terseLabel": "Loans",
        "totalLabel": "Loans, net",
        "verboseLabel": "Loans and leases receivable, net amount"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableNetReportedAmount",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.",
        "label": "Loans and Leases Receivable, Ratio of Nonperforming Loans to All Loans",
        "verboseLabel": "Total non-accrual loans to total loans"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_LoansAndLeasesReceivableRelatedParties": {
     "auth_ref": [
      "r527",
      "r621"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.",
        "label": "Loans and Leases Receivable, Related Parties",
        "periodEndLabel": "Ending balance",
        "periodStartLabel": "Beginning balance"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableRelatedParties",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsSummaryOfLoansToDirectorsExecutiveOfficersAndAffiliatesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions": {
     "auth_ref": [
      "r527",
      "r621"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reflects the amount of new advances made to related parties in the form of loan and lease receivables.",
        "label": "Loans and Leases Receivable, Related Parties, Additions",
        "terseLabel": "New loans"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableRelatedPartiesAdditions",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsSummaryOfLoansToDirectorsExecutiveOfficersAndAffiliatesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease": {
     "auth_ref": [
      "r527",
      "r621"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase (decrease) in loans and leases receivable due from related parties.",
        "label": "Loans and Leases Receivable, Related Parties, Period Increase (Decrease)",
        "terseLabel": "Adjustments due to changes in directors, executive officers, and/or principal stockholders"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsSummaryOfLoansToDirectorsExecutiveOfficersAndAffiliatesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds": {
     "auth_ref": [
      "r73",
      "r613"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.",
        "label": "Loans and Leases Receivable, Related Parties, Proceeds",
        "negatedLabel": "Repayments"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableRelatedPartiesProceeds",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsSummaryOfLoansToDirectorsExecutiveOfficersAndAffiliatesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableTroubledDebtRestructuringPolicy": {
     "auth_ref": [
      "r210"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for troubled debt restructuring.",
        "label": "Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block]",
        "verboseLabel": "Troubled Debt Restructurings"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableTroubledDebtRestructuringPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock": {
     "auth_ref": [
      "r205"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.",
        "label": "Loans, Notes, Trade and Other Receivables Disclosure [Text Block]",
        "terseLabel": "Loans"
       }
      }
     },
     "localname": "LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/Loans"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LoansPledgedAsCollateral": {
     "auth_ref": [
      "r196",
      "r557"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.",
        "label": "Loans Pledged as Collateral",
        "terseLabel": "Qualifying loans pledged as collateral"
       }
      }
     },
     "localname": "LoansPledgedAsCollateral",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansReceivableHeldForSaleAmount": {
     "auth_ref": [
      "r171",
      "r723"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 19.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before valuation allowance, of financing receivable classified as held-for-sale.",
        "label": "Loans Receivable Held-for-sale, Amount",
        "terseLabel": "Loans held for sale"
       }
      }
     },
     "localname": "LoansReceivableHeldForSaleAmount",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup": {
     "auth_ref": [
      "r171",
      "r723"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.",
        "label": "Loans Receivable Held-for-sale, Net, Not Part of Disposal Group",
        "terseLabel": "Loans held for sale"
       }
      }
     },
     "localname": "LoansReceivableHeldForSaleNetNotPartOfDisposalGroup",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LossContingenciesByNatureOfContingencyAxis": {
     "auth_ref": [
      "r281",
      "r282",
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r290",
      "r291"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur.",
        "label": "Loss Contingency Nature [Axis]",
        "terseLabel": "Loss Contingency Nature [Axis]"
       }
      }
     },
     "localname": "LossContingenciesByNatureOfContingencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingenciesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Loss Contingencies [Line Items]",
        "terseLabel": "Loss Contingencies [Line Items]"
       }
      }
     },
     "localname": "LossContingenciesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingenciesTable": {
     "auth_ref": [
      "r281",
      "r282",
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r290",
      "r291"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Discloses the specific components (such as the nature, name, and date) of the loss contingency and gives an estimate of the possible loss or range of loss, or states that a reasonable estimate cannot be made. Excludes environmental contingencies, warranties and unconditional purchase obligations.",
        "label": "Loss Contingencies [Table]",
        "terseLabel": "Loss Contingencies [Table]"
       }
      }
     },
     "localname": "LossContingenciesTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingencyNatureDomain": {
     "auth_ref": [
      "r281",
      "r282",
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r290",
      "r291"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "An existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur. Resolution of the uncertainty may confirm the incurrence of a loss or impairment of an asset or the incurrence of a liability.",
        "label": "Loss Contingency, Nature [Domain]",
        "terseLabel": "Loss Contingency, Nature [Domain]"
       }
      }
     },
     "localname": "LossContingencyNatureDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ManagingOfRisksInherentInServicingAssetsAndServicingLiabilitiesTable": {
     "auth_ref": [
      "r566"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Summarization of information pertaining to the risks inherent in servicing assets and servicing liabilities and, if applicable, the instruments used to mitigate the income statement effect of changes in fair value of the servicing assets and servicing liabilities.",
        "label": "Schedule of Managing of Risks Inherent in Servicing Assets and Servicing Liabilities [Table]",
        "terseLabel": "Schedule of Managing of Risks Inherent in Servicing Assets and Servicing Liabilities [Table]"
       }
      }
     },
     "localname": "ManagingOfRisksInherentInServicingAssetsAndServicingLiabilitiesTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_MarketableSecurities": {
     "auth_ref": [
      "r620"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of investment in marketable security.",
        "label": "Marketable Securities",
        "terseLabel": "Marketable equity securities",
        "verboseLabel": "Marketable securities"
       }
      }
     },
     "localname": "MarketableSecurities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MarketableSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Marketable Securities [Abstract]"
       }
      }
     },
     "localname": "MarketableSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_MarketableSecuritiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Marketable Securities [Line Items]",
        "terseLabel": "Marketable Securities [Line Items]"
       }
      }
     },
     "localname": "MarketableSecuritiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_MarketableSecuritiesPolicy": {
     "auth_ref": [
      "r652"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for investment classified as marketable security.",
        "label": "Marketable Securities, Policy [Policy Text Block]",
        "verboseLabel": "Available for Sale Securities"
       }
      }
     },
     "localname": "MarketableSecuritiesPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_MarketableSecuritiesTable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about investment in marketable security.",
        "label": "Marketable Securities [Table]",
        "terseLabel": "Marketable Securities [Table]"
       }
      }
     },
     "localname": "MarketableSecuritiesTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_MarketableSecuritiesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.",
        "label": "Marketable Securities [Table Text Block]",
        "terseLabel": "Summary of Amortized Costs and Fair Value of Securities Available for Sale"
       }
      }
     },
     "localname": "MarketableSecuritiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_MarketableSecuritiesUnrealizedGainLoss": {
     "auth_ref": [
      "r68"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 20.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of unrealized gain (loss) on investment in marketable security.",
        "label": "Marketable Securities, Unrealized Gain (Loss)",
        "terseLabel": "Unrealized Gain (Loss) Marketable Securities",
        "verboseLabel": "Unrealized gain on marketable equity securities"
       }
      }
     },
     "localname": "MarketableSecuritiesUnrealizedGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MarketingAndAdvertisingExpense": {
     "auth_ref": [
      "r71"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 23.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The total expense recognized in the period for promotion, public relations, and brand or product advertising.",
        "label": "Marketing and Advertising Expense",
        "terseLabel": "Advertising and promotions"
       }
      }
     },
     "localname": "MarketingAndAdvertisingExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MeasurementInputDiscountRateMember": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Measurement input using interest rate to determine present value of future cash flows.",
        "label": "Measurement Input, Discount Rate [Member]"
       }
      }
     },
     "localname": "MeasurementInputDiscountRateMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MeasurementInputPrepaymentRateMember": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Measurement input using principal prepayment at other than constant rate as proportion of outstanding loan principal.",
        "label": "Measurement Input, Prepayment Rate [Member]"
       }
      }
     },
     "localname": "MeasurementInputPrepaymentRateMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MeasurementInputTypeAxis": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of measurement input used to determine value of asset and liability.",
        "label": "Measurement Input Type [Axis]",
        "terseLabel": "Measurement Input Type [Axis]"
       }
      }
     },
     "localname": "MeasurementInputTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_MeasurementInputTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Measurement input used to determine value of asset and liability.",
        "label": "Measurement Input Type [Domain]",
        "terseLabel": "Measurement Input Type [Domain]"
       }
      }
     },
     "localname": "MeasurementInputTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember": {
     "auth_ref": [
      "r355"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Debt securities collateralized by real estate mortgage loans (mortgages), issued by US Government Sponsored Enterprises, such as Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac).",
        "label": "Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]",
        "terseLabel": "Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]"
       }
      }
     },
     "localname": "MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MortgageLoansInProcessOfForeclosureAmount": {
     "auth_ref": [
      "r195"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.",
        "label": "Mortgage Loans in Process of Foreclosure, Amount",
        "terseLabel": "Loans in process of foreclosure"
       }
      }
     },
     "localname": "MortgageLoansInProcessOfForeclosureAmount",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r84"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 1.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
        "label": "Net Cash Provided by (Used in) Financing Activities",
        "totalLabel": "Net cash provided by financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]",
        "terseLabel": "Cash flows from financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "auth_ref": [
      "r84"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 12.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
        "label": "Net Cash Provided by (Used in) Investing Activities",
        "totalLabel": "Net cash used in investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]",
        "terseLabel": "Cash Flows From Investing Activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r84",
      "r88",
      "r91"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 21.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
        "label": "Net Cash Provided by (Used in) Operating Activities",
        "totalLabel": "Net cash provided by operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Cash flows from operating activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLoss": {
     "auth_ref": [
      "r3",
      "r50",
      "r53",
      "r59",
      "r64",
      "r91",
      "r104",
      "r117",
      "r119",
      "r120",
      "r122",
      "r123",
      "r127",
      "r128",
      "r137",
      "r161",
      "r162",
      "r165",
      "r166",
      "r168",
      "r235",
      "r295",
      "r296",
      "r297",
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r493",
      "r510",
      "r625",
      "r679"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": 6.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
        "label": "Net Income (Loss) Attributable to Parent",
        "presentationGuidance": "Net income",
        "totalLabel": "Net income",
        "verboseLabel": "Net income"
       }
      }
     },
     "localname": "NetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.",
        "label": "New Accounting Pronouncements, Policy [Policy Text Block]",
        "verboseLabel": "Recent Accounting Pronouncements"
       }
      }
     },
     "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NoncashInvestingAndFinancingItemsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Noncash Investing and Financing Items [Abstract]",
        "presentationGuidance": "Noncash activities:"
       }
      }
     },
     "localname": "NoncashInvestingAndFinancingItemsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NoninterestBearingDepositLiabilities": {
     "auth_ref": [
      "r615"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_Deposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.",
        "label": "Noninterest-bearing Deposit Liabilities",
        "terseLabel": "Non-interest bearing checking"
       }
      }
     },
     "localname": "NoninterestBearingDepositLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsCompositionOfDepositsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NoninterestExpense": {
     "auth_ref": [
      "r636"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 21.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Total aggregate amount of all noninterest expense.",
        "label": "Noninterest Expense",
        "totalLabel": "Total noninterest expense"
       }
      }
     },
     "localname": "NoninterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NoninterestExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Noninterest Expense [Abstract]",
        "terseLabel": "Noninterest expense:"
       }
      }
     },
     "localname": "NoninterestExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NoninterestIncome": {
     "auth_ref": [
      "r635"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 13.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.",
        "label": "Noninterest Income",
        "totalLabel": "Total noninterest income"
       }
      }
     },
     "localname": "NoninterestIncome",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NoninterestIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Noninterest Income [Abstract]",
        "terseLabel": "Noninterest income:"
       }
      }
     },
     "localname": "NoninterestIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NoninterestIncomeOtherOperatingIncome": {
     "auth_ref": [
      "r61",
      "r623",
      "r684"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 19.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of revenue earned, classified as other, excluding interest income.",
        "label": "Noninterest Income, Other Operating Income",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "NoninterestIncomeOtherOperatingIncome",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NonperformingFinancingReceivableMember": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Category status of financial instruments in which payments are past due in accordance with the terms of the contract. Financial instruments include, but are not limited to, financing receivables, loans, debt, and investments.",
        "label": "Nonperforming Financial Instruments [Member]",
        "terseLabel": "Non Performing [Member]"
       }
      }
     },
     "localname": "NonperformingFinancingReceivableMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NotesReceivableGross": {
     "auth_ref": [
      "r201",
      "r241",
      "r246",
      "r251",
      "r260",
      "r261",
      "r748",
      "r750",
      "r751"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before allowance for credit loss, of financing receivable.",
        "label": "Financing Receivable, before Allowance for Credit Loss",
        "terseLabel": "Past Due / Current Loans"
       }
      }
     },
     "localname": "NotesReceivableGross",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesReceivableNet": {
     "auth_ref": [
      "r16",
      "r171",
      "r251"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.",
        "label": "Financing Receivable, after Allowance for Credit Loss, Total",
        "totalLabel": "Total loans"
       }
      }
     },
     "localname": "NotesReceivableNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OffBalanceSheetCreditExposurePolicyPolicyTextBlock": {
     "auth_ref": [
      "r202",
      "r250"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Description of accounting policies and methodologies used to estimate the entity's liability for off-balance sheet credit exposures and related charges for those credit exposures.",
        "label": "Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]",
        "verboseLabel": "Off-Balance\u00a0Sheet Instruments"
       }
      }
     },
     "localname": "OffBalanceSheetCreditExposurePolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OperatingLossCarryforwards": {
     "auth_ref": [
      "r446"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.",
        "label": "Operating Loss Carryforwards",
        "verboseLabel": "Federal Loss Carryforwards"
       }
      }
     },
     "localname": "OperatingLossCarryforwards",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock": {
     "auth_ref": [
      "r113",
      "r130",
      "r158",
      "r483"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.",
        "label": "Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]",
        "verboseLabel": "Organization"
       }
      }
     },
     "localname": "OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherAssets": {
     "auth_ref": [
      "r9",
      "r607",
      "r672"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 26.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of assets classified as other.",
        "label": "Other Assets",
        "terseLabel": "Other assets"
       }
      }
     },
     "localname": "OtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitment": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.",
        "label": "Other Commitment",
        "terseLabel": "Other commitments"
       }
      }
     },
     "localname": "OtherCommitment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentsAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of other commitment.",
        "label": "Other Commitments [Axis]",
        "terseLabel": "Other Commitments [Axis]"
       }
      }
     },
     "localname": "OtherCommitmentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherCommitmentsDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Other future obligation.",
        "label": "Other Commitments [Domain]",
        "terseLabel": "Other Commitments [Domain]"
       }
      }
     },
     "localname": "OtherCommitmentsDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent": {
     "auth_ref": [
      "r471",
      "r472",
      "r477"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": 3.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before tax of other comprehensive income (loss) attributable to parent entity.",
        "label": "Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent",
        "totalLabel": "Other comprehensive (loss) income before tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r51",
      "r54",
      "r57",
      "r58",
      "r60",
      "r65",
      "r335",
      "r512",
      "r517",
      "r518",
      "r626",
      "r680"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).",
        "label": "Other Comprehensive Income (Loss), Net of Tax",
        "totalLabel": "Other comprehensive (loss) income, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Other Comprehensive Income (Loss), Net of Tax [Abstract]",
        "verboseLabel": "Other comprehensive (loss) income:"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent": {
     "auth_ref": [
      "r51",
      "r54",
      "r471",
      "r472",
      "r477"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after tax of other comprehensive income (loss) attributable to parent entity.",
        "label": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent",
        "verboseLabel": "Other comprehensive income"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax": {
     "auth_ref": [
      "r44",
      "r48",
      "r49",
      "r229"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": 5.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax",
        "negatedLabel": "Reclassification adjustment for gains realized in net income"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossTax": {
     "auth_ref": [
      "r45",
      "r57",
      "r65",
      "r435",
      "r463",
      "r465",
      "r512",
      "r515",
      "r518",
      "r626",
      "r680"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of tax expense (benefit) allocated to other comprehensive income (loss).",
        "label": "Other Comprehensive Income (Loss), Tax",
        "terseLabel": "Other comprehensive income (loss) tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1": {
     "auth_ref": [
      "r471",
      "r472",
      "r477"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "definitionGuidance": "Tax effect of other comprehensive (loss) income items",
        "documentation": "Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.",
        "label": "Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossTaxPortionAttributableToParent1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax": {
     "auth_ref": [
      "r42",
      "r44",
      "r229"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome": {
       "order": 4.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.",
        "label": "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax",
        "terseLabel": "Unrealized holding (losses) gains arising during the period"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfComprehensiveLossIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherInterestAndDividendIncome": {
     "auth_ref": [
      "r638"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 8.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount, after discount, accretion and premium amortization, of interest income and dividend income classified as other.",
        "label": "Other Interest and Dividend Income",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherInterestAndDividendIncome",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLiabilities": {
     "auth_ref": [
      "r618"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 6.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of liabilities classified as other.",
        "label": "Other Liabilities",
        "terseLabel": "Other liabilities"
       }
      }
     },
     "localname": "OtherLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNoninterestExpense": {
     "auth_ref": [
      "r636"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 27.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of noninterest expense classified as other.",
        "label": "Other Noninterest Expense",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherNoninterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PassMember": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A category of financing receivables not considered to be special mention, substandard, doubtful, and loss receivables.",
        "label": "Pass [Member]",
        "terseLabel": "Pass [Member]"
       }
      }
     },
     "localname": "PassMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PastDueFinancingReceivablesTableTextBlock": {
     "auth_ref": [
      "r200",
      "r201",
      "r246",
      "r261"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of aging analysis for financing receivable.",
        "label": "Past Due Financing Receivables [Table Text Block]",
        "terseLabel": "Schedule of Analysis of Past due Loans"
       }
      }
     },
     "localname": "PastDueFinancingReceivablesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PaymentDeferralMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan modification for a temporary postponement of loan payments.",
        "label": "Payment Deferral [Member]"
       }
      }
     },
     "localname": "PaymentDeferralMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale": {
     "auth_ref": [
      "r83",
      "r87"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 25.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of cash paid for the origination of mortgages that are held for sale.",
        "label": "Payments for Origination of Mortgage Loans Held-for-sale",
        "negatedLabel": "Originations of mortgage loans held for sale"
       }
      }
     },
     "localname": "PaymentsForOriginationOfMortgageLoansHeldForSale",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock": {
     "auth_ref": [],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 13.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash outflow (inflow) from acquisition (sale) of Federal Home Loan Bank (FHLBank) stock.",
        "label": "Payments for (Proceeds from) Federal Home Loan Bank Stock",
        "negatedLabel": "Net increase in Federal Home Loan Bank stock"
       }
      }
     },
     "localname": "PaymentsForProceedsFromFederalHomeLoanBankStock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromLoansAndLeases": {
     "auth_ref": [
      "r643"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 16.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.",
        "label": "Payments for (Proceeds from) Loans and Leases",
        "negatedLabel": "Net (increase) decrease in loans"
       }
      }
     },
     "localname": "PaymentsForProceedsFromLoansAndLeases",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForRepurchaseOfEquity": {
     "auth_ref": [
      "r78"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash outflow to reacquire common and preferred stock.",
        "label": "Payments for Repurchase of Equity",
        "negatedLabel": "Purchases of common stock"
       }
      }
     },
     "localname": "PaymentsForRepurchaseOfEquity",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfStockIssuanceCosts": {
     "auth_ref": [
      "r80"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash outflow for cost incurred directly with the issuance of an equity security.",
        "label": "Payments of Stock Issuance Costs",
        "negatedLabel": "Stock offering costs"
       }
      }
     },
     "localname": "PaymentsOfStockIssuanceCosts",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireAvailableForSaleSecurities": {
     "auth_ref": [
      "r75",
      "r212"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 17.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.",
        "label": "Payments to Acquire Available-for-sale Securities",
        "negatedLabel": "Purchases of available for sale securities"
       }
      }
     },
     "localname": "PaymentsToAcquireAvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock": {
     "auth_ref": [
      "r354",
      "r356",
      "r362",
      "r363",
      "r365",
      "r366",
      "r367",
      "r368",
      "r369",
      "r371",
      "r372",
      "r375",
      "r377",
      "r381"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for retirement benefits.",
        "label": "Pension and Other Postretirement Benefits Disclosure [Text Block]",
        "terseLabel": "Employee Benefit Plans"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeBenefitPlans"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PensionAndOtherPostretirementPlansPolicy": {
     "auth_ref": [
      "r370",
      "r373",
      "r374",
      "r377",
      "r378"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.",
        "label": "Pension and Other Postretirement Plans, Policy [Policy Text Block]",
        "verboseLabel": "Employee Benefit Plans"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementPlansPolicy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PerformingFinancingReceivableMember": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Category status of financial instruments in which payments are received or paid on a timely basis in accordance with the terms of the contract. Financial instruments include, but are not limited to, financing receivables, loans, debt instruments, and investments.",
        "label": "Performing Financial Instruments [Member]",
        "terseLabel": "Performing [Member]"
       }
      }
     },
     "localname": "PerformingFinancingReceivableMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PlanNameAxis": {
     "auth_ref": [
      "r385",
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by plan name for share-based payment arrangement.",
        "label": "Plan Name [Axis]",
        "terseLabel": "Plan name [Axis]"
       }
      }
     },
     "localname": "PlanNameAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PlanNameDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Plan name for share-based payment arrangement.",
        "label": "Plan Name [Domain]",
        "terseLabel": "Plan name [Domain]"
       }
      }
     },
     "localname": "PlanNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PortionAtFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r506"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Measured at fair value for financial reporting purposes.",
        "label": "Portion at Fair Value Measurement [Member]"
       }
      }
     },
     "localname": "PortionAtFairValueFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PreferredStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r14",
      "r328"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.",
        "label": "Preferred Stock, Par or Stated Value Per Share",
        "terseLabel": "Preferred stock par or stated value per share"
       }
      }
     },
     "localname": "PreferredStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_PreferredStockSharesAuthorized": {
     "auth_ref": [
      "r14"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.",
        "label": "Preferred Stock, Shares Authorized",
        "terseLabel": "Preferred stock shares authorized"
       }
      }
     },
     "localname": "PreferredStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockValue": {
     "auth_ref": [
      "r14",
      "r535"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 14.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Preferred Stock, Value, Issued",
        "terseLabel": "Preferred stock, $0.01 par value, 10,000,000 shares authorized at December\u00a031, 2021 and December\u00a031, 2020"
       }
      }
     },
     "localname": "PreferredStockValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PriorPeriodReclassificationAdjustmentDescription": {
     "auth_ref": [
      "r2"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for reclassification affecting comparability of financial statement. Excludes amendment to accounting standards, other change in accounting principle, and correction of error.",
        "label": "Reclassification, Policy [Policy Text Block]",
        "verboseLabel": "Reclassifications"
       }
      }
     },
     "localname": "PriorPeriodReclassificationAdjustmentDescription",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ProceedsFromFederalHomeLoanBankBorrowings": {
     "auth_ref": [
      "r77"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow from Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity.",
        "label": "Proceeds from FHLBank Borrowings, Financing Activities",
        "terseLabel": "Proceeds from the issuance of FHLB advances"
       }
      }
     },
     "localname": "ProceedsFromFederalHomeLoanBankBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfCommonStock": {
     "auth_ref": [
      "r76"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash inflow from the additional capital contribution to the entity.",
        "label": "Proceeds from Issuance of Common Stock",
        "terseLabel": "Proceeds from stock offering"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities": {
     "auth_ref": [
      "r72",
      "r73",
      "r212"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 20.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale",
        "verboseLabel": "Maturities, prepayments, and calls of available for sale securities"
       }
      }
     },
     "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities": {
     "auth_ref": [
      "r74",
      "r212"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 19.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.",
        "label": "Proceeds from Sale of Available-for-sale Securities",
        "terseLabel": "Proceeds from sales of securities available-for-sale",
        "verboseLabel": "Proceeds from sales of available for sale securities"
       }
      }
     },
     "localname": "ProceedsFromSaleOfAvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfProceedsFromSalesOfSecuritiesAvailableForSaleAsWellAsGrossGainsAndLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale": {
     "auth_ref": [
      "r83",
      "r85"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 26.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.",
        "label": "Proceeds from Sale of Mortgage Loans Held-for-sale",
        "verboseLabel": "Proceeds from sales of mortgage loans held for sale"
       }
      }
     },
     "localname": "ProceedsFromSaleOfMortgageLoansHeldForSale",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfTreasuryStock": {
     "auth_ref": [
      "r76"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 10.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.",
        "label": "Proceeds from Sale of Treasury Stock",
        "terseLabel": "Sale of treasury stock by Rabbi Trust"
       }
      }
     },
     "localname": "ProceedsFromSaleOfTreasuryStock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromStockOptionsExercised": {
     "auth_ref": [
      "r76",
      "r415"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 11.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash inflow from exercise of option under share-based payment arrangement.",
        "label": "Proceeds from Stock Options Exercised",
        "terseLabel": "Stock options exercised"
       }
      }
     },
     "localname": "ProceedsFromStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProfitLoss": {
     "auth_ref": [
      "r3",
      "r50",
      "r53",
      "r59",
      "r82",
      "r104",
      "r117",
      "r127",
      "r128",
      "r161",
      "r162",
      "r165",
      "r166",
      "r168",
      "r235",
      "r295",
      "r296",
      "r297",
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r471",
      "r475",
      "r476",
      "r481",
      "r482",
      "r493",
      "r510",
      "r644"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 30.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.",
        "label": "Net Income (Loss), Including Portion Attributable to Noncontrolling Interest",
        "verboseLabel": "Net income"
       }
      }
     },
     "localname": "ProfitLoss",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Property, Plant and Equipment [Abstract]",
        "terseLabel": "Property Plant And Equipment [Abstract]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentByTypeAxis": {
     "auth_ref": [
      "r26",
      "r276"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.",
        "label": "Property, Plant and Equipment, Type [Axis]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentByTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock": {
     "auth_ref": [
      "r277",
      "r727",
      "r728",
      "r729"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.",
        "label": "Property, Plant and Equipment Disclosure [Text Block]",
        "terseLabel": "Premises and Equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipment"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentGross": {
     "auth_ref": [
      "r25",
      "r274"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, Plant and Equipment, Gross",
        "terseLabel": "Premises and equipment, gross"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentGross",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Property, Plant and Equipment [Line Items]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r7",
      "r8",
      "r276",
      "r535",
      "r655",
      "r677"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 22.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, Plant and Equipment, Net",
        "terseLabel": "Premises and equipment, net",
        "totalLabel": "Premises and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock": {
     "auth_ref": [
      "r24",
      "r276",
      "r727",
      "r728"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.",
        "label": "Property, Plant and Equipment, Policy [Policy Text Block]",
        "verboseLabel": "Premises and Equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTextBlock": {
     "auth_ref": [
      "r7",
      "r276"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.",
        "label": "Property, Plant and Equipment [Table Text Block]",
        "terseLabel": "Summary of Premises and Equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTypeDomain": {
     "auth_ref": [
      "r7",
      "r274"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.",
        "label": "Property, Plant and Equipment, Type [Domain]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ProvisionForLoanAndLeaseLosses": {
     "auth_ref": [
      "r89",
      "r176",
      "r632"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations": {
       "order": 12.0,
       "parentTag": "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of expense related to estimated loss from loan and lease transactions.",
        "label": "Provision for Loan and Lease Losses",
        "terseLabel": "Provision for loan losses",
        "verboseLabel": "Provision (credit) for loan losses"
       }
      }
     },
     "localname": "ProvisionForLoanAndLeaseLosses",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RealEstateLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan to finance the purchase of real estate, including but not limited to, land or building.",
        "label": "Real Estate Loan [Member]",
        "terseLabel": "Commercial Real Estate [Member]"
       }
      }
     },
     "localname": "RealEstateLoanMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RealEstateMember": {
     "auth_ref": [
      "r349"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Property consisting of land, land improvement and buildings.",
        "label": "Real Estate [Member]",
        "terseLabel": "Real Estate [Member]"
       }
      }
     },
     "localname": "RealEstateMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ReceivablesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Receivables [Abstract]"
       }
      }
     },
     "localname": "ReceivablesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock": {
     "auth_ref": [
      "r660",
      "r661",
      "r662",
      "r664",
      "r665",
      "r666",
      "r668",
      "r669"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union.",
        "label": "Regulatory Capital Requirements under Banking Regulations [Text Block]",
        "terseLabel": "Equity and Regulatory Matters"
       }
      }
     },
     "localname": "RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMatters"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RelatedPartyDepositLiabilities": {
     "auth_ref": [
      "r108"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deposits held by the entity for a related party (entity, shareholder, employee).",
        "label": "Related Party Deposit Liabilities",
        "terseLabel": "Deposits from directors, executive officers and affiliates"
       }
      }
     },
     "localname": "RelatedPartyDepositLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RelatedPartyDomain": {
     "auth_ref": [
      "r364",
      "r526",
      "r527"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Related parties include affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
        "label": "Related Party [Domain]",
        "terseLabel": "Related Party [Domain]"
       }
      }
     },
     "localname": "RelatedPartyDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty": {
     "auth_ref": [
      "r526"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.",
        "label": "Related Party Transaction, Expenses from Transactions with Related Party",
        "terseLabel": "Fees paid to law firms"
       }
      }
     },
     "localname": "RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RelatedPartyTransactionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Related Party Transaction [Line Items]",
        "terseLabel": "Related Party Transaction [Line Items]"
       }
      }
     },
     "localname": "RelatedPartyTransactionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Related Party Transactions [Abstract]"
       }
      }
     },
     "localname": "RelatedPartyTransactionsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsByRelatedPartyAxis": {
     "auth_ref": [
      "r364",
      "r526",
      "r530",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r597",
      "r598",
      "r599",
      "r600",
      "r601",
      "r602",
      "r603"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of related party. Related parties include, but not limited to, affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
        "label": "Related Party [Axis]",
        "terseLabel": "Related Party [Axis]"
       }
      }
     },
     "localname": "RelatedPartyTransactionsByRelatedPartyAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsDisclosureTextBlock": {
     "auth_ref": [
      "r524",
      "r525",
      "r527",
      "r531",
      "r532"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
        "label": "Related Party Transactions Disclosure [Text Block]",
        "terseLabel": "Related Party Transactions"
       }
      }
     },
     "localname": "RelatedPartyTransactionsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactions"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings": {
     "auth_ref": [
      "r79"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity.",
        "label": "Payments of FHLBank Borrowings, Financing Activities",
        "negatedLabel": "Principal payments on Federal Home Loan Bank advances"
       }
      }
     },
     "localname": "RepaymentsOfFederalHomeLoanBankBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ResidentialMortgageMember": {
     "auth_ref": [
      "r260"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loan to purchase or refinance residential real estate for example, but not limited to, a home, in which the real estate itself serves as collateral for the loan.",
        "label": "Residential Mortgage [Member]",
        "terseLabel": "Residential [Member]"
       }
      }
     },
     "localname": "ResidentialMortgageMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ResidentialRealEstateMember": {
     "auth_ref": [
      "r257",
      "r355"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Property that is used as a home.",
        "label": "Residential Real Estate [Member]",
        "terseLabel": "Residential Real Estate [Member]"
       }
      }
     },
     "localname": "ResidentialRealEstateMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestrictedStockMember": {
     "auth_ref": [
      "r141"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met.",
        "label": "Restricted Stock [Member]",
        "terseLabel": "Restricted stock [Member]"
       }
      }
     },
     "localname": "RestrictedStockMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "auth_ref": [
      "r18",
      "r336",
      "r419",
      "r535",
      "r675",
      "r699",
      "r704"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 8.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings (Accumulated Deficit)",
        "terseLabel": "Retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsMember": {
     "auth_ref": [
      "r0",
      "r114",
      "r115",
      "r116",
      "r118",
      "r125",
      "r128",
      "r238",
      "r416",
      "r417",
      "r418",
      "r454",
      "r455",
      "r491",
      "r695",
      "r697"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings [Member]",
        "verboseLabel": "Retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerPolicyTextBlock": {
     "auth_ref": [
      "r101",
      "r340",
      "r341",
      "r342",
      "r343",
      "r344",
      "r345",
      "r346",
      "r347",
      "r350"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for revenue from contract with customer.",
        "label": "Revenue from Contract with Customer [Policy Text Block]",
        "verboseLabel": "Revenue Recognition"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RisksAndUncertaintiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Risks and Uncertainties [Abstract]"
       }
      }
     },
     "localname": "RisksAndUncertaintiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RisksInherentInServicingAssetsAndServicingLiabilitiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]",
        "terseLabel": "Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]"
       }
      }
     },
     "localname": "RisksInherentInServicingAssetsAndServicingLiabilitiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable": {
     "auth_ref": [
      "r37"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule itemizing specific types of trade accounts and notes receivable, and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.",
        "label": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]",
        "terseLabel": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]"
       }
      }
     },
     "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock": {
     "auth_ref": [
      "r37"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.",
        "label": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]",
        "terseLabel": "Summary of Major Classifications of Loans"
       }
      }
     },
     "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Securities, Available-for-sale [Line Items]",
        "terseLabel": "Debt Securities, Available-for-sale [Line Items]"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleByContractualMaturityDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.",
        "label": "Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]",
        "terseLabel": "Schedule of Banks Actual and Required Capital Amounts and Ratios"
       }
      }
     },
     "localname": "ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock": {
     "auth_ref": [
      "r453"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.",
        "label": "Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]",
        "terseLabel": "Schedule of Components of Income Tax Expense (Benefit)"
       }
      }
     },
     "localname": "ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock": {
     "auth_ref": [
      "r443"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.",
        "label": "Schedule of Deferred Tax Assets and Liabilities [Table Text Block]",
        "terseLabel": "Schedule of Deferred Tax Assets and Liabilities"
       }
      }
     },
     "localname": "ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": {
     "auth_ref": [
      "r140"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.",
        "label": "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]",
        "terseLabel": "Schedule of Earnings Per Share, Basic and Diluted"
       }
      }
     },
     "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock": {
     "auth_ref": [
      "r436"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.",
        "label": "Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]",
        "terseLabel": "Schedule of Effective Income Tax Rate Reconciliation"
       }
      }
     },
     "localname": "ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTextBlock": {
     "auth_ref": [
      "r429"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the details pertaining to each employee stock ownership plan.",
        "label": "Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]",
        "verboseLabel": "Employee Stock Ownership Plan (ESOP) Disclosures"
       }
      }
     },
     "localname": "ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanTable"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable": {
     "auth_ref": [
      "r507",
      "r508"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule detailing the information required and determined to be disclosed regarding the fair value of financial assets and financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.",
        "label": "Schedule of Fair Value, Off-balance Sheet Risks [Table]",
        "terseLabel": "Schedule of Fair Value, Off-balance Sheet Risks [Table]"
       }
      }
     },
     "localname": "ScheduleOfFairValueOffBalanceSheetRisksTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTextBlock": {
     "auth_ref": [
      "r507",
      "r508"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.",
        "label": "Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]",
        "terseLabel": "Summary of Contractual Amounts of Off-balance-sheet Credit-related Financial Instruments"
       }
      }
     },
     "localname": "ScheduleOfFairValueOffBalanceSheetRisksTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable": {
     "auth_ref": [
      "r252",
      "r260"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about credit quality indicator for financing receivable.",
        "label": "Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table]",
        "terseLabel": "Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table]"
       }
      }
     },
     "localname": "ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingTheCreditQualityIndicatorsForResidentialRealEstateAndConsumerLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfFinancingReceivablesPastDueTable": {
     "auth_ref": [
      "r246",
      "r261"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about aging analysis for financing receivable.",
        "label": "Schedule of Financing Receivables Past Due [Table]",
        "terseLabel": "Schedule of Financing Receivables Past Due [Table]"
       }
      }
     },
     "localname": "ScheduleOfFinancingReceivablesPastDueTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansScheduleOfAnalysisOfPastDueLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfImpairedFinancingReceivableTable": {
     "auth_ref": [
      "r187"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule of the recorded investment, unpaid principal balance, associated allowance, average recorded investment, accounting policies, and interest income recognized on the accrual and cash basis for impaired financing receivables by class of financing receivable.",
        "label": "Schedule of Impaired Financing Receivable [Table]",
        "terseLabel": "Schedule of Impaired Financing Receivable [Table]"
       }
      }
     },
     "localname": "ScheduleOfImpairedFinancingReceivableTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInformationRegardingImpairedLoansDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": {
     "auth_ref": [
      "r294"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of maturity and sinking fund requirement for long-term debt.",
        "label": "Schedule of Maturities of Long-term Debt [Table Text Block]",
        "terseLabel": "Schedule of Maturities of Federal Home Loan Bank Advances"
       }
      }
     },
     "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfRealizedGainLossTableTextBlock": {
     "auth_ref": [
      "r228"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.",
        "label": "Schedule of Realized Gain (Loss) [Table Text Block]",
        "terseLabel": "Summary of Proceeds from Sales of Securities Available-for-sale, as well as Gross Gains and Losses"
       }
      }
     },
     "localname": "ScheduleOfRealizedGainLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable": {
     "auth_ref": [
      "r528",
      "r530"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule of quantitative and qualitative information pertaining to related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
        "label": "Schedule of Related Party Transactions, by Related Party [Table]",
        "terseLabel": "Schedule of Related Party Transactions, by Related Party [Table]"
       }
      }
     },
     "localname": "ScheduleOfRelatedPartyTransactionsByRelatedPartyTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates.",
        "label": "Schedule of Related Party Transactions [Table Text Block]",
        "terseLabel": "Summary of Loans to Directors, Executive Officers and Affiliates"
       }
      }
     },
     "localname": "ScheduleOfRelatedPartyTransactionsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/RelatedPartyTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfServicingAssetsAtAmortizedValueTextBlock": {
     "auth_ref": [
      "r575"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization.",
        "label": "Servicing Asset at Amortized Cost [Table Text Block]",
        "terseLabel": "Summary of Activity in Mortgage Servicing Rights"
       }
      }
     },
     "localname": "ScheduleOfServicingAssetsAtAmortizedValueTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": {
     "auth_ref": [
      "r385",
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information about share-based payment arrangement.",
        "label": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]",
        "terseLabel": "Share-based compensation arrangement by share-based payment award [Table]"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock": {
     "auth_ref": [
      "r390"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.",
        "label": "Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]",
        "terseLabel": "Summary of Restricted Stock Unit Activity"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock": {
     "auth_ref": [
      "r390",
      "r401",
      "r404"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.",
        "label": "Share-based Payment Arrangement, Option, Activity [Table Text Block]",
        "terseLabel": "Summary of Stock Option Activity"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock": {
     "auth_ref": [
      "r406"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.",
        "label": "Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]",
        "terseLabel": "Summary of Assumptions Used in Estimating the Fair Value of Options Granted"
       }
      }
     },
     "localname": "ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock": {
     "auth_ref": [
      "r270"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.",
        "label": "Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]",
        "terseLabel": "Summary of Estimated Future Amortization Expense for Mortgage Servicing Rights"
       }
      }
     },
     "localname": "ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ServicingAssetAtAmortizedValue": {
     "auth_ref": [
      "r563",
      "r564",
      "r576"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.",
        "label": "Servicing Asset at Amortized Cost",
        "periodEndLabel": "Mortgage servicing rights ending balance",
        "periodStartLabel": "Mortgage servicing rights beginning balance",
        "terseLabel": "Servicing assets at amortised cost"
       }
      }
     },
     "localname": "ServicingAssetAtAmortizedValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfActivityInMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ServicingAssetAtAmortizedValueAdditions": {
     "auth_ref": [
      "r577"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.",
        "label": "Servicing Asset at Amortized Cost, Additions",
        "terseLabel": "Additions"
       }
      }
     },
     "localname": "ServicingAssetAtAmortizedValueAdditions",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfActivityInMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ServicingAssetAtAmortizedValueAmortization1": {
     "auth_ref": [
      "r579"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.",
        "label": "Servicing Asset at Amortized Cost, Amortization",
        "negatedLabel": "Amortization"
       }
      }
     },
     "localname": "ServicingAssetAtAmortizedValueAmortization1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfActivityInMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ServicingAssetAtAmortizedValueBalanceRollForward": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Servicing Asset at Amortized Cost, Balance [Roll Forward]",
        "terseLabel": "Servicing Asset At Amortized Value Balance Roll Forward"
       }
      }
     },
     "localname": "ServicingAssetAtAmortizedValueBalanceRollForward",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_ServicingAssetAtAmortizedValueFairValue": {
     "auth_ref": [
      "r488",
      "r583"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.",
        "label": "Servicing Asset at Amortized Cost, Fair Value",
        "periodEndLabel": "Fair value at end of period",
        "periodStartLabel": "Fair value at beginning of period",
        "terseLabel": "Servicing assets at fair value"
       }
      }
     },
     "localname": "ServicingAssetAtAmortizedValueFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfActivityInMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ServicingAssetAtAmortizedValueValuationAllowance": {
     "auth_ref": [
      "r580"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.",
        "label": "Servicing Asset at Amortized Cost, Increase (Decrease) for Valuation Allowance Adjustment",
        "negatedLabel": "Decrease (increase) in valuation allowance"
       }
      }
     },
     "localname": "ServicingAssetAtAmortizedValueValuationAllowance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsSummaryOfActivityInMortgageServicingRightsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate": {
     "auth_ref": [
      "r567"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Discount rate used to estimate the fair value of servicing assets and servicing liabilities.",
        "label": "Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate",
        "terseLabel": "Discount rates used in valuation model"
       }
      }
     },
     "localname": "ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed": {
     "auth_ref": [
      "r567"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Estimated rate of prepayments of principal on servicing assets and servicing liabilities.",
        "label": "Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed",
        "terseLabel": "Prepayment speeds used in valuation model"
       }
      }
     },
     "localname": "ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ShareBasedCompensation": {
     "auth_ref": [
      "r89"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows": {
       "order": 34.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of noncash expense for share-based payment arrangement.",
        "label": "Share-based Compensation",
        "verboseLabel": "ESOP compensation"
       }
      }
     },
     "localname": "ShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": {
     "auth_ref": [
      "r386"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period",
        "terseLabel": "Vested Years Of Service"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod": {
     "auth_ref": [
      "r395"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period",
        "negatedLabel": "Forfeited"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r400"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value",
        "terseLabel": "Forfeited"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": {
     "auth_ref": [
      "r398"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r398"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber": {
     "auth_ref": [
      "r396"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number",
        "periodEndLabel": "Nonvested",
        "periodStartLabel": "Nonvested",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r396"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value",
        "periodEndLabel": "Nonvested",
        "periodStartLabel": "Nonvested"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease": {
     "auth_ref": [
      "r397"
     ],
     "lang": {
      "en-us": {
       "role": {
        "definitionGuidance": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)",
        "documentation": "The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)",
        "terseLabel": "Shares granted as a nonqualified stock option inducement award",
        "verboseLabel": "Shares granted as a nonqualified stock option inducement award"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod": {
     "auth_ref": [
      "r399"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period",
        "negatedLabel": "Vested"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r399"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value",
        "terseLabel": "Vested"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price",
        "terseLabel": "Weighted average per share value of options"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInEstimatingTheFairValueOfOptionsGrantedDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate": {
     "auth_ref": [
      "r409"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate",
        "terseLabel": "Dividend yield"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInEstimatingTheFairValueOfOptionsGrantedDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate": {
     "auth_ref": [
      "r408"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate",
        "terseLabel": "Expected volatility"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInEstimatingTheFairValueOfOptionsGrantedDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate": {
     "auth_ref": [
      "r410"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The risk-free interest rate assumption that is used in valuing an option on its own shares.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate",
        "terseLabel": "Risk-free interest rate"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInEstimatingTheFairValueOfOptionsGrantedDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]",
        "terseLabel": "Share-based compensation arrangement by share-based payment award [Line Items]"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized": {
     "auth_ref": [
      "r387"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares authorized for issuance under share-based payment arrangement.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized",
        "terseLabel": "Stock based compensation number of shares authorized"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber": {
     "auth_ref": [
      "r393"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number",
        "terseLabel": "Stock options - Options exercisable"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice": {
     "auth_ref": [
      "r393"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price",
        "terseLabel": "Weighted Average Exercise Price - Options exercisable"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue": {
     "auth_ref": [
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value",
        "terseLabel": "Aggregate Intrinsic Value - Exercised"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod": {
     "auth_ref": [
      "r395"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period",
        "negatedLabel": "Stock options - Shares forfeited"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue": {
     "auth_ref": [
      "r402"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value",
        "terseLabel": "Aggregate Intrinsic Value - Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Gross number of share options (or share units) granted during the period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross",
        "terseLabel": "Stock options - Shares granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r402"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue": {
     "auth_ref": [
      "r414"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value",
        "periodEndLabel": "Aggregate Intrinsic Value - Ending"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber": {
     "auth_ref": [
      "r392",
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of options outstanding, including both vested and non-vested options.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number",
        "periodEndLabel": "Stock options - Ending",
        "periodStartLabel": "Stock options - Beginning"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": {
     "auth_ref": [
      "r391"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price",
        "periodEndLabel": "Weighted Average Exercise Price - Ending",
        "periodStartLabel": "Weighted Average Exercise Price - Beginning"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber": {
     "auth_ref": [
      "r405"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": {
     "auth_ref": [
      "r383",
      "r388"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Award under share-based payment arrangement.",
        "label": "Award Type [Domain]",
        "terseLabel": "Award type [Domain]"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average price at which option holders acquired shares when converting their stock options into shares.",
        "label": "Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price",
        "terseLabel": "Weighted Average Exercise Price - Exercised"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.",
        "label": "Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price",
        "terseLabel": "Weighted Average Exercise Price - Forfeited"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.",
        "label": "Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price",
        "terseLabel": "Weighted Average Exercise Price - Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationAwardTrancheOneMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "First portion of award under share-based payment arrangement differentiated by vesting feature, including, but not limited to, performance measure or service period.",
        "label": "Share-based Compensation Award, Tranche One [Member]",
        "terseLabel": "Share-based Compensation Award, Tranche One [Member]"
       }
      }
     },
     "localname": "ShareBasedCompensationAwardTrancheOneMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensationAwardTrancheThreeMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Third portion of award under share-based payment arrangement differentiated by vesting feature, including, but not limited to, performance measure or service period.",
        "label": "Share-based Compensation Award, Tranche Three [Member]"
       }
      }
     },
     "localname": "ShareBasedCompensationAwardTrancheThreeMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensationAwardTrancheTwoMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Second portion of award under share-based payment arrangement differentiated by vesting feature, including, but not limited to, performance measure or service period.",
        "label": "Share-based Compensation Award, Tranche Two [Member]",
        "terseLabel": "Share-based Compensation Award, Tranche Two [Member]"
       }
      }
     },
     "localname": "ShareBasedCompensationAwardTrancheTwoMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage": {
     "auth_ref": [
      "r386"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of vesting of award under share-based payment arrangement.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage",
        "terseLabel": "Vested Percentage"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1": {
     "auth_ref": [
      "r407",
      "r420"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term",
        "terseLabel": "Weighted average expected life"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInEstimatingTheFairValueOfOptionsGrantedDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1": {
     "auth_ref": [
      "r414"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value",
        "terseLabel": "Aggregate Intrinsic Value - Options exercisable"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1": {
     "auth_ref": [
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term",
        "terseLabel": "Weighted Average Remaining Contractual Term (Years) - Options exercisable"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of non-vested options outstanding.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares",
        "periodEndLabel": "Nonvested",
        "periodStartLabel": "Nonvested"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of non-vested options forfeited.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares",
        "negatedLabel": "Forfeited"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average grant-date fair value of non-vested options forfeited.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value",
        "verboseLabel": "Forfeited"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average grant-date fair value of non-vested options outstanding.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price",
        "periodEndLabel": "Nonvested",
        "periodStartLabel": "Nonvested"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2": {
     "auth_ref": [
      "r405"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term",
        "terseLabel": "Weighted Average Remaining Contractual Term (Years)"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1": {
     "auth_ref": [
      "r389"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average grant-date fair value of options vested.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value",
        "terseLabel": "Vested"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityDetail"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShortTermDebtTypeAxis": {
     "auth_ref": [
      "r30"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of short-term debt arrangement.",
        "label": "Short-term Debt, Type [Axis]"
       }
      }
     },
     "localname": "ShortTermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShortTermDebtTypeDomain": {
     "auth_ref": [
      "r28"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Type of short-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.",
        "label": "Short-term Debt, Type [Domain]"
       }
      }
     },
     "localname": "ShortTermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SignificantAccountingPoliciesTextBlock": {
     "auth_ref": [
      "r100",
      "r113"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.",
        "label": "Significant Accounting Policies [Text Block]",
        "terseLabel": "Summary of Significant Accounting Policies"
       }
      }
     },
     "localname": "SignificantAccountingPoliciesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SpecialMentionMember": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A category of financing receivables considered to have potential weaknesses that deserve management's close attention. If left uncorrected, those potential weaknesses may result in a deterioration of the repayment prospects for the asset or of the creditor's position at some future date.",
        "label": "Special Mention [Member]",
        "terseLabel": "Watch and Special Mention [Member]"
       }
      }
     },
     "localname": "SpecialMentionMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_StandbyLettersOfCreditMember": {
     "auth_ref": [
      "r289",
      "r293",
      "r470",
      "r706"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation.",
        "label": "Standby Letters of Credit [Member]",
        "terseLabel": "Standby Letters of Credit [Member]"
       }
      }
     },
     "localname": "StandbyLettersOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_StateAndLocalJurisdictionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Designated tax department of a state or local government entitled to levy and collect income taxes from the entity.",
        "label": "State and Local Jurisdiction [Member]"
       }
      }
     },
     "localname": "StateAndLocalJurisdictionMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_StatementClassOfStockAxis": {
     "auth_ref": [
      "r13",
      "r14",
      "r15",
      "r102",
      "r104",
      "r134",
      "r135",
      "r136",
      "r138",
      "r140",
      "r148",
      "r149",
      "r150",
      "r235",
      "r295",
      "r299",
      "r300",
      "r301",
      "r304",
      "r305",
      "r328",
      "r329",
      "r332",
      "r333",
      "r335",
      "r510",
      "r740"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by the different classes of stock of the entity.",
        "label": "Class of Stock [Axis]"
       }
      }
     },
     "localname": "StatementClassOfStockAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r0",
      "r36",
      "r57",
      "r58",
      "r59",
      "r114",
      "r115",
      "r116",
      "r118",
      "r125",
      "r128",
      "r147",
      "r238",
      "r335",
      "r336",
      "r416",
      "r417",
      "r418",
      "r454",
      "r455",
      "r491",
      "r512",
      "r513",
      "r514",
      "r515",
      "r516",
      "r518",
      "r695",
      "r696",
      "r697",
      "r775"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Equity Components [Axis]"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Statement [Line Items]"
       }
      }
     },
     "localname": "StatementLineItems",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [
      "r114",
      "r115",
      "r116",
      "r147",
      "r590"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
        "label": "Statement [Table]"
       }
      }
     },
     "localname": "StatementTable",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/CashAndDueFromBanksAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/DeferredCompensationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanEmployeeStockOwnershipPlanEsopDisclosuresDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesNetDeferredTaxAssetAndLiabilitiesDetail",
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesSummaryOfTheSourcesOfDifferencesBetweenIncomeTaxesAtTheFederalStatutoryRateAndTheProvisionCreditForIncomeTaxesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfNonperformingLoansDetail",
      "http://www.1895bancorpofwisconsin.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentAdditionalInformationDetails",
      "http://www.1895bancorpofwisconsin.com/role/PremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfNonvestedStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfRestrictedStockUnitActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityParentheticalDetail",
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": {
     "auth_ref": [
      "r14",
      "r15",
      "r335",
      "r336",
      "r394"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of share options (or share units) exercised during the current period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period",
        "negatedLabel": "Stock options - Shares exercised"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan": {
     "auth_ref": [
      "r14",
      "r15",
      "r335",
      "r336"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.",
        "label": "Stock Issued During Period, Value, Employee Stock Purchase Plan",
        "negatedLabel": "Purchase of ESOP Shares"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueEmployeeStockPurchasePlan",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueNewIssues": {
     "auth_ref": [
      "r14",
      "r15",
      "r335",
      "r336"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.",
        "label": "Stock Issued During Period, Value, New Issues",
        "terseLabel": "Gross proceeds from stock offering"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueNewIssues",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised": {
     "auth_ref": [
      "r36",
      "r335",
      "r336"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Value of stock issued as a result of the exercise of stock options.",
        "label": "Stock Issued During Period, Value, Stock Options Exercised",
        "terseLabel": "Stock options exercised"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockRepurchasedDuringPeriodValue": {
     "auth_ref": [
      "r14",
      "r15",
      "r335",
      "r336"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.",
        "label": "Stock Repurchased During Period, Value",
        "negatedLabel": "Repurchase of common stock"
       }
      }
     },
     "localname": "StockRepurchasedDuringPeriodValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquity": {
     "auth_ref": [
      "r15",
      "r20",
      "r21",
      "r104",
      "r203",
      "r235",
      "r510",
      "r535"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 7.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.",
        "label": "Stockholders' Equity Attributable to Parent",
        "periodEndLabel": "Balance",
        "periodStartLabel": "Balance",
        "totalLabel": "Total stockholders' equity"
       }
      }
     },
     "localname": "StockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets",
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SubsequentEventTypeAxis": {
     "auth_ref": [
      "r519",
      "r536"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event Type [Axis]",
        "terseLabel": "Subsequent event type [Axis]"
       }
      }
     },
     "localname": "SubsequentEventTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventTypeDomain": {
     "auth_ref": [
      "r519",
      "r536"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event Type [Domain]",
        "terseLabel": "Subsequent event type [Domain]"
       }
      }
     },
     "localname": "SubsequentEventTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SubstandardMember": {
     "auth_ref": [
      "r190",
      "r252"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A category of financing receivables that are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the creditor will sustain some loss if the deficiencies are not corrected.",
        "label": "Substandard [Member]",
        "terseLabel": "Substandard [Member]"
       }
      }
     },
     "localname": "SubstandardMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfInternalRiskRatingsOfLoansDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SupplementalCashFlowInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Supplemental Cash Flow Information [Abstract]",
        "terseLabel": "Supplemental cash flow information:"
       }
      }
     },
     "localname": "SupplementalCashFlowInformationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TaxCreditCarryforwardAxis": {
     "auth_ref": [
      "r447"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by specific tax credit related to an unused tax credit.",
        "label": "Tax Credit Carryforward [Axis]"
       }
      }
     },
     "localname": "TaxCreditCarryforwardAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TaxCreditCarryforwardNameDomain": {
     "auth_ref": [
      "r447"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The name of the tax credit carryforward.",
        "label": "Tax Credit Carryforward, Name [Domain]"
       }
      }
     },
     "localname": "TaxCreditCarryforwardNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/IncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TextBlockAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Text Block [Abstract]",
        "terseLabel": "Banking And Thrift [Abstract]"
       }
      }
     },
     "localname": "TextBlockAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_TierOneLeverageCapital": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of Tier 1 leverage capital as defined by regulatory framework.",
        "label": "Tier One Leverage Capital",
        "terseLabel": "Total risk based capital actual amount"
       }
      }
     },
     "localname": "TierOneLeverageCapital",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.",
        "label": "Tier One Leverage Capital Required for Capital Adequacy",
        "terseLabel": "Total risk based capital for capital adequacy purposes amount"
       }
      }
     },
     "localname": "TierOneLeverageCapitalRequiredForCapitalAdequacy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.",
        "label": "Tier One Leverage Capital Required for Capital Adequacy to Average Assets",
        "terseLabel": "Total risk based capital for capital adequacy purposes ratio"
       }
      }
     },
     "localname": "TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Tier One Leverage Capital Required to be Well Capitalized",
        "terseLabel": "Total risk based capital to be well capitalized under prompt corrective action provisions amount"
       }
      }
     },
     "localname": "TierOneLeverageCapitalRequiredToBeWellCapitalized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Tier One Leverage Capital Required to be Well Capitalized to Average Assets",
        "terseLabel": "Total risk based capital to be well capitalized under prompt corrective action provisions ratio"
       }
      }
     },
     "localname": "TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_TierOneLeverageCapitalToAverageAssets": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of Tier 1 capital to average assets as defined by regulatory framework.",
        "label": "Tier One Leverage Capital to Average Assets",
        "terseLabel": "Total risk based capital actual ratio"
       }
      }
     },
     "localname": "TierOneLeverageCapitalToAverageAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_TierOneRiskBasedCapital": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of Tier 1 risk-based capital as defined by regulatory framework.",
        "label": "Tier One Risk Based Capital",
        "terseLabel": "Tier 1 risk based capital actual amount"
       }
      }
     },
     "localname": "TierOneRiskBasedCapital",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.",
        "label": "Tier One Risk Based Capital Required for Capital Adequacy",
        "terseLabel": "Tier 1 risk based capital for capital adequacy purposes amount"
       }
      }
     },
     "localname": "TierOneRiskBasedCapitalRequiredForCapitalAdequacy",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets": {
     "auth_ref": [
      "r663",
      "r667"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.",
        "label": "Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets",
        "terseLabel": "Tier 1 risk based capital for capital adequacy purposes ratio"
       }
      }
     },
     "localname": "TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized": {
     "auth_ref": [
      "r663"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Tier One Risk Based Capital Required to be Well Capitalized",
        "terseLabel": "Tier 1 risk based capital to be well capitalized under prompt corrective action provisions amount"
       }
      }
     },
     "localname": "TierOneRiskBasedCapitalRequiredToBeWellCapitalized",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.",
        "label": "Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets",
        "terseLabel": "Tier 1 risk based capital to be well capitalized under prompt corrective action provisions ratio"
       }
      }
     },
     "localname": "TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets": {
     "auth_ref": [
      "r663"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.",
        "label": "Tier One Risk Based Capital to Risk Weighted Assets",
        "terseLabel": "Tier 1 risk based capital actual ratio"
       }
      }
     },
     "localname": "TierOneRiskBasedCapitalToRiskWeightedAssets",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EquityAndRegulatoryMattersScheduleOfBanksActualAndRequiredCapitalAmountsAndRatiosDetail"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_TimeDepositMaturitiesTableTextBlock": {
     "auth_ref": [
      "r294"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of time deposit liability maturities.",
        "label": "Time Deposit Maturities [Table Text Block]",
        "terseLabel": "Scheduled Maturities of Certificates of Deposit"
       }
      }
     },
     "localname": "TimeDepositMaturitiesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_TimeDepositMaturitiesYearFive": {
     "auth_ref": [
      "r294"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail": {
       "order": 4.0,
       "parentTag": "us-gaap_TimeDeposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit maturing in fifth fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Time Deposit Maturities, Year Five",
        "terseLabel": "2026"
       }
      }
     },
     "localname": "TimeDepositMaturitiesYearFive",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDepositMaturitiesYearFour": {
     "auth_ref": [
      "r294"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail": {
       "order": 3.0,
       "parentTag": "us-gaap_TimeDeposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit maturing in fourth fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Time Deposit Maturities, Year Four",
        "terseLabel": "2025"
       }
      }
     },
     "localname": "TimeDepositMaturitiesYearFour",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDepositMaturitiesYearOne": {
     "auth_ref": [
      "r294"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail": {
       "order": 5.0,
       "parentTag": "us-gaap_TimeDeposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit maturing in next fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Time Deposit Maturities, Next Twelve Months",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "TimeDepositMaturitiesYearOne",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDepositMaturitiesYearThree": {
     "auth_ref": [
      "r294"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_TimeDeposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit maturing in third fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Time Deposit Maturities, Year Three",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "TimeDepositMaturitiesYearThree",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDepositMaturitiesYearTwo": {
     "auth_ref": [
      "r294"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail": {
       "order": 1.0,
       "parentTag": "us-gaap_TimeDeposits",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit maturing in second fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Time Deposit Maturities, Year Two",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "TimeDepositMaturitiesYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDeposits": {
     "auth_ref": [
      "r615",
      "r658"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit liabilities, including certificates of deposit.",
        "label": "Time Deposits",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "TimeDeposits",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsScheduledMaturitiesOfCertificatesOfDepositDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit": {
     "auth_ref": [
      "r658"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.",
        "label": "Time Deposits, at or Above FDIC Insurance Limit",
        "terseLabel": "Certificates of deposit with balances of $250 or more"
       }
      }
     },
     "localname": "TimeDepositsAtOrAboveFDICInsuranceLimit",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/DepositsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TimeDepositsByMaturityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Time Deposits, Fiscal Year Maturity [Abstract]"
       }
      }
     },
     "localname": "TimeDepositsByMaturityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1": {
     "auth_ref": [
      "r96",
      "r97",
      "r98"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.",
        "label": "Transfer of Portfolio Loans and Leases to Held-for-sale",
        "terseLabel": "Loans transferred to loans held for sale"
       }
      }
     },
     "localname": "TransferOfPortfolioLoansAndLeasesToHeldForSale1",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TransfersAndServicingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Transfers and Servicing [Abstract]",
        "verboseLabel": "Transfers And Servicing [Abstract]"
       }
      }
     },
     "localname": "TransfersAndServicingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_TransfersAndServicingOfFinancialAssetsPolicyTextBlock": {
     "auth_ref": [
      "r548",
      "r558",
      "r565",
      "r568",
      "r575"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for transfers and servicing financial assets, including securitization transactions as well as repurchase and resale agreements. This disclosure may include how the entity (1) determines whether a transaction is accounted for as a sale; (2) accounts for a sale transaction, including the initial and subsequent accounting for any interests that the entity obtains or continues to hold in the transaction, how such interests are valued, and the significant assumptions used in the valuation; (3) accounts for a transaction that does not qualify for sale treatment (that is, a financing); and (4) accounts for its servicing assets and liabilities (\"servicing\"), including how such servicing is measured initially and subsequently, and the methodology and significant assumptions used to value such servicing.",
        "label": "Transfers and Servicing of Financial Assets, Policy [Policy Text Block]",
        "verboseLabel": "Transfers of Financial Assets"
       }
      }
     },
     "localname": "TransfersAndServicingOfFinancialAssetsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_TransfersAndServicingOfFinancialAssetsTextBlock": {
     "auth_ref": [
      "r537",
      "r538",
      "r543",
      "r547",
      "r549",
      "r550",
      "r555",
      "r556",
      "r559",
      "r560",
      "r562",
      "r565",
      "r566",
      "r567",
      "r568",
      "r573",
      "r574",
      "r582",
      "r584",
      "r588"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows.",
        "label": "Transfers and Servicing of Financial Assets [Text Block]",
        "terseLabel": "Mortgage Servicing Rights"
       }
      }
     },
     "localname": "TransfersAndServicingOfFinancialAssetsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRights"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": {
     "auth_ref": [
      "r222",
      "r223",
      "r231",
      "r232",
      "r233",
      "r323",
      "r334",
      "r489",
      "r537",
      "r538",
      "r539",
      "r540",
      "r541",
      "r542",
      "r544",
      "r545",
      "r546",
      "r551",
      "r552",
      "r553",
      "r554",
      "r557",
      "r561",
      "r569",
      "r570",
      "r571",
      "r572",
      "r576",
      "r577",
      "r578",
      "r579",
      "r580",
      "r581",
      "r582",
      "r583",
      "r585",
      "r586",
      "r587",
      "r740",
      "r741",
      "r742",
      "r743",
      "r744",
      "r745",
      "r746"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Instrument or contract that imposes a contractual obligation to deliver cash or another financial instrument or to exchange other financial instruments on potentially unfavorable terms and conveys a contractual right to receive cash or another financial instrument or to exchange other financial instruments on potentially favorable terms.",
        "label": "Financial Instruments [Domain]",
        "terseLabel": "Financial Instruments [Domain]"
       }
      }
     },
     "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/CommitmentsAndContingenciesSummaryOfContractualAmountsOfOffBalanceSheetCreditRelatedFinancialInstrumentsDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfActivityInAllowanceForLoanAndLeaseLossesDetail",
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfAllowanceForLoanAndLeaseLossesForLoansEvaluatedIndividuallyAndCollectivelyForImpairmentDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockMember": {
     "auth_ref": [
      "r35",
      "r338"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Treasury Stock [Member]",
        "terseLabel": "Treasury Stock"
       }
      }
     },
     "localname": "TreasuryStockMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockRetiredCostMethodAmount": {
     "auth_ref": [
      "r15",
      "r335",
      "r337"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.",
        "label": "Treasury Stock, Retired, Cost Method, Amount",
        "terseLabel": "Retirement of treasury shares from stock offering"
       }
      }
     },
     "localname": "TreasuryStockRetiredCostMethodAmount",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TreasuryStockShares": {
     "auth_ref": [
      "r35",
      "r338"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.",
        "label": "Treasury Stock, Shares",
        "terseLabel": "Treasury stock"
       }
      }
     },
     "localname": "TreasuryStockShares",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_TreasuryStockValue": {
     "auth_ref": [
      "r35",
      "r338",
      "r339"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets": {
       "order": 13.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.",
        "label": "Treasury Stock, Value",
        "negatedLabel": "Less treasury stock at cost, 30,063 at December 31, 2021 and 127,225 at December 31, 2020"
       }
      }
     },
     "localname": "TreasuryStockValue",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TreasuryStockValueAcquiredCostMethod": {
     "auth_ref": [
      "r335",
      "r336",
      "r338"
     ],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.",
        "label": "Treasury Stock, Value, Acquired, Cost Method",
        "negatedLabel": "Purchase of treasury stock by Rabbi Trust"
       }
      }
     },
     "localname": "TreasuryStockValueAcquiredCostMethod",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock": {
     "auth_ref": [
      "r192",
      "r194"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of financing receivable modified as troubled debt restructuring.",
        "label": "Troubled Debt Restructurings on Financing Receivables [Table Text Block]",
        "terseLabel": "Summary of Information Regarding Non-accrual Loans"
       }
      }
     },
     "localname": "TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_USStatesAndPoliticalSubdivisionsMember": {
     "auth_ref": [
      "r355",
      "r705"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, but not limited to, housing authorities, dormitory authorities, and general obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments.",
        "label": "US States and Political Subdivisions Debt Securities [Member]",
        "terseLabel": "US States and Political Subdivisions Debt Securities [Member]"
       }
      }
     },
     "localname": "USStatesAndPoliticalSubdivisionsMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail",
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USTreasuryNotesSecuritiesMember": {
     "auth_ref": [
      "r645"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This category includes information about negotiable debt securities issued by the United States Department of the Treasury which generally have maturities of one to ten years, are interest bearing, and are backed by the full faith and credit of the United States government.",
        "label": "US Treasury Notes Securities [Member]",
        "terseLabel": "U.S. Treasury notes [Member]"
       }
      }
     },
     "localname": "USTreasuryNotesSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueSummaryOfAssetsMeasuredAtFairValueOnARecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USTreasurySecuritiesMember": {
     "auth_ref": [
      "r109",
      "r355",
      "r371",
      "r645"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This category includes information about debt securities issued by the United States Department of the Treasury and backed by the United States government. Such securities primarily consist of treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years).",
        "label": "US Treasury Securities [Member]"
       }
      }
     },
     "localname": "USTreasurySecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfAmortizedCostsAndFairValueOfSecuritiesAvailableForSaleDetail",
      "http://www.1895bancorpofwisconsin.com/role/AvailableForSaleSecuritiesSummaryOfGrossUnrealizedLossesOnSecuritiesAvailableForSaleAndFairValuesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums": {
     "auth_ref": [
      "r206"
     ],
     "calculation": {
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail": {
       "order": 2.0,
       "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.",
        "label": "Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums",
        "terseLabel": "Net deferred loan costs"
       }
      }
     },
     "localname": "UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/LoansSummaryOfMajorClassificationsOfLoansDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UseOfEstimates": {
     "auth_ref": [
      "r151",
      "r152",
      "r153",
      "r154",
      "r155",
      "r156",
      "r157"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.",
        "label": "Use of Estimates, Policy [Policy Text Block]",
        "verboseLabel": "Use of Estimates"
       }
      }
     },
     "localname": "UseOfEstimates",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance": {
     "auth_ref": [
      "r585"
     ],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.",
        "label": "Valuation Allowance for Impairment of Recognized Servicing Assets, Balance",
        "verboseLabel": "Mortgage servicing rights , valuation allowance"
       }
      }
     },
     "localname": "ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/MortgageServicingRightsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ValuationTechniqueAxis": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by valuation approach and technique.",
        "label": "Valuation Approach and Technique [Axis]",
        "terseLabel": "Valuation Approach and Technique [Axis]"
       }
      }
     },
     "localname": "ValuationTechniqueAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ValuationTechniqueDomain": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Valuation approach and technique.",
        "label": "Valuation Approach and Technique [Domain]",
        "terseLabel": "Valuation Approach and Technique [Domain]"
       }
      }
     },
     "localname": "ValuationTechniqueDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FairValueScheduleOfQuantitativeInformationAboutNonrecurringLevel3FairValueMeasurementsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_VariableRateAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by type of variable rate.",
        "label": "Variable Rate [Axis]"
       }
      }
     },
     "localname": "VariableRateAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VariableRateDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.",
        "label": "Variable Rate [Domain]"
       }
      }
     },
     "localname": "VariableRateDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/FhlbAdvancesAndOtherBorrowingsAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_VestingAxis": {
     "auth_ref": [
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information by vesting schedule of award under share-based payment arrangement.",
        "label": "Vesting [Axis]"
       }
      }
     },
     "localname": "VestingAxis",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VestingDomain": {
     "auth_ref": [
      "r414"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Vesting schedule of award under share-based payment arrangement.",
        "label": "Vesting [Domain]"
       }
      }
     },
     "localname": "VestingDomain",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedBalanceSheetsParenthetical",
      "http://www.1895bancorpofwisconsin.com/role/EmployeeStockOwnershipPlanAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment": {
     "auth_ref": [
      "r140"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.",
        "label": "Weighted Average Number Diluted Shares Outstanding Adjustment",
        "verboseLabel": "Additional dilutive shares"
       }
      }
     },
     "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustment",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": {
     "auth_ref": [
      "r133",
      "r140"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.",
        "label": "Weighted Average Number of Shares Outstanding, Diluted",
        "verboseLabel": "Diluted"
       }
      }
     },
     "localname": "WeightedAverageNumberOfDilutedSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).",
        "label": "Weighted Average Number of Shares Outstanding, Basic and Diluted",
        "terseLabel": "Weighted average shares outstanding for dilutive EPS"
       }
      }
     },
     "localname": "WeightedAverageNumberOfShareOutstandingBasicAndDiluted",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased": {
     "auth_ref": [
      "r424"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of employee stock ownership plan (ESOP) shares that have not been committed to be released determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.",
        "label": "Weighted Average Number of Shares, Employee Stock Ownership Plan Shares Not Committed to be Released",
        "terseLabel": "Less: Weighted average unallocated ESOP shares"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesIssuedBasic": {
     "auth_ref": [
      "r131",
      "r132"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).",
        "label": "Weighted Average Number of Shares Issued, Basic",
        "terseLabel": "Weighted average shares outstanding"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesIssuedBasic",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": {
     "auth_ref": [
      "r131",
      "r140"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.",
        "label": "Weighted Average Number of Shares Outstanding, Basic",
        "terseLabel": "Weighted average shares outstanding for basic EPS",
        "verboseLabel": "Basic"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasic",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/ConsolidatedStatementsOfOperations",
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Weighted Average Number of Shares Outstanding, Basic [Abstract]",
        "verboseLabel": "Weighted shares outstanding for basic EPS"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasicAbstract",
     "nsuri": "http://fasb.org/us-gaap/2021-01-31",
     "presentation": [
      "http://www.1895bancorpofwisconsin.com/role/EarningsPerShareEarningsPerCommonShareDetail"
     ],
     "xbrltype": "stringItemType"
    }
   },
   "unitCount": 9
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "105",
   "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695"
  },
  "r1": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "105",
   "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=123372394&loc=d3e18726-107790"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=123372394&loc=d3e18823-107790"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(d))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(g)(1)(ii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(h)(1)(Note 1))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(h)(2))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(h))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r108": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(k)(1))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(m)(1)(ii)(A))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r11": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(20))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(m)(1)(iii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r111": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(m)(2)(ii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.12-04(a))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "235",
   "URI": "http://asc.fasb.org/topic&trid=2122369"
  },
  "r114": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "23",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124436220&loc=d3e21914-107793"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124436220&loc=d3e21930-107793"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124436220&loc=d3e21711-107793"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794"
  },
  "r118": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(3)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794"
  },
  "r12": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(22))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=SL124452830-107794"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794"
  },
  "r125": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794"
  },
  "r126": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.M.Q2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=122038215&loc=d3e31137-122693"
  },
  "r13": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(27))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "250",
   "URI": "http://asc.fasb.org/topic&trid=2122394"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e2646-109256"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1252-109256"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1278-109256"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "55",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e2626-109256"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=SL5780133-109256"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=SL5780133-109256"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1337-109256"
  },
  "r14": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(28))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125512782&loc=d3e3842-109258"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "52",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=125512782&loc=d3e4984-109258"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "260",
   "URI": "http://asc.fasb.org/topic&trid=2144383"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=125520817&loc=d3e70191-108054"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=125520817&loc=d3e70229-108054"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055"
  },
  "r15": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(29))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592"
  },
  "r154": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "275",
   "URI": "http://asc.fasb.org/topic&trid=2134479"
  },
  "r159": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599"
  },
  "r16": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r160": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599"
  },
  "r161": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "31",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8924-108599"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599"
  },
  "r167": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599"
  },
  "r168": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599"
  },
  "r169": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599"
  },
  "r17": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=124259787&loc=d3e4647-111522"
  },
  "r171": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522"
  },
  "r172": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522"
  },
  "r173": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524"
  },
  "r174": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r175": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r176": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(3)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r178": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(4)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r179": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r18": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r181": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524"
  },
  "r182": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524"
  },
  "r183": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(3)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524"
  },
  "r184": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(4)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524"
  },
  "r185": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524"
  },
  "r186": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524"
  },
  "r187": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524"
  },
  "r188": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524"
  },
  "r189": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5033-111524"
  },
  "r19": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(4))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r190": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953659-111524"
  },
  "r191": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5066-111524"
  },
  "r192": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524"
  },
  "r193": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "34",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "34",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL49126937-111524"
  },
  "r196": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5086-111524"
  },
  "r197": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5093-111524"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524"
  },
  "r2": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=124429488&loc=d3e326-107755"
  },
  "r20": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524"
  },
  "r202": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5144-111524"
  },
  "r203": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 4.E)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.L.1)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/subtopic&trid=2196772"
  },
  "r206": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10133-111534"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(1)(ii)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554"
  },
  "r21": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(31))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "40",
   "Topic": "310",
   "URI": "http://asc.fasb.org/subtopic&trid=2196892"
  },
  "r211": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(aa)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563"
  },
  "r22": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(32))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563"
  },
  "r225": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(3)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563"
  },
  "r226": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563"
  },
  "r228": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563"
  },
  "r23": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.1)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "320",
   "URI": "http://asc.fasb.org/topic&trid=2196928"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "321",
   "URI": "http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714"
  },
  "r232": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "321",
   "URI": "http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714"
  },
  "r233": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "321",
   "URI": "http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714"
  },
  "r234": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "321",
   "URI": "http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714"
  },
  "r235": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r236": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "30",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=66904272&loc=d3e41925-111603"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=73718008&loc=d3e42658-111610"
  },
  "r238": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437"
  },
  "r239": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(3)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437"
  },
  "r24": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r240": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(4)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437"
  },
  "r241": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446"
  },
  "r242": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447"
  },
  "r243": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447"
  },
  "r244": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447"
  },
  "r245": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447"
  },
  "r248": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447"
  },
  "r25": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919272-210447"
  },
  "r251": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447"
  },
  "r252": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447"
  },
  "r253": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921830-210448"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921833-210448"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921835-210448"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921835-210448"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(d)(1)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921835-210448"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(d)(2)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921835-210448"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82921842-210448"
  },
  "r26": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.14)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "79",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "80",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(2)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455"
  },
  "r264": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(3)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455"
  },
  "r265": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455"
  },
  "r266": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922895-210455"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456"
  },
  "r27": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.17)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(1)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r272": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(3)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r273": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r274": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r276": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r277": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "360",
   "URI": "http://asc.fasb.org/topic&trid=2155823"
  },
  "r278": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "440",
   "URI": "http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308"
  },
  "r279": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "440",
   "URI": "http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308"
  },
  "r28": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14394-108349"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14453-108349"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14472-108349"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248"
  },
  "r29": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(b),22(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248"
  },
  "r291": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=124440162&loc=d3e12053-110248"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(4)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=123408193&loc=d3e12803-110250"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-01(a)(4)(i))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-01(a)(4)(ii))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-01(a)(4)(iii)(A))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-01(a)(4)(iii))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756"
  },
  "r299": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-01(a)(4)(iv))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756"
  },
  "r3": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760"
  },
  "r30": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-01(a)(5))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-02(a)(4)(i))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-02(a)(4)(iii)(A))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-02(a)(4)(iii)(B))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756"
  },
  "r304": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-02(a)(4)(iv))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756"
  },
  "r305": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.13-02(a)(5))",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r307": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r308": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r309": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r31": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19-26)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r312": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611"
  },
  "r313": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611"
  },
  "r314": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611"
  },
  "r315": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611"
  },
  "r316": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611"
  },
  "r317": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611"
  },
  "r318": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611"
  },
  "r319": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1F",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611"
  },
  "r32": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22 (b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r320": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1F",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611"
  },
  "r321": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1F",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611"
  },
  "r322": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1F",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611"
  },
  "r323": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1I",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611"
  },
  "r324": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "69B",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612"
  },
  "r325": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "69C",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612"
  },
  "r326": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "69E",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612"
  },
  "r327": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "69F",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612"
  },
  "r328": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644"
  },
  "r329": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644"
  },
  "r33": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r330": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644"
  },
  "r331": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644"
  },
  "r332": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644"
  },
  "r333": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644"
  },
  "r334": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644"
  },
  "r335": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644"
  },
  "r336": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.3-04)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770"
  },
  "r337": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770"
  },
  "r338": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655"
  },
  "r339": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656"
  },
  "r34": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r340": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130561-203045"
  },
  "r341": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130563-203045"
  },
  "r342": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130563-203045"
  },
  "r343": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130564-203045"
  },
  "r344": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130566-203045"
  },
  "r345": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130566-203045"
  },
  "r346": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130566-203045"
  },
  "r347": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130566-203045"
  },
  "r348": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045"
  },
  "r349": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=123410239&loc=SL49130690-203046-203046"
  },
  "r35": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29,30)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r350": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "606",
   "URI": "http://asc.fasb.org/topic&trid=49130388"
  },
  "r351": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "710",
   "URI": "http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361"
  },
  "r352": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "30",
   "SubTopic": "10",
   "Topic": "710",
   "URI": "http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363"
  },
  "r353": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(6)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r354": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(i)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r355": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(ii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r356": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r357": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(01)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r358": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r359": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(A)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r36": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29-31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r360": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(B)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r361": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(C)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r362": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(03)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r363": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(l)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r364": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(n)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r365": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(o)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r366": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(p)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r367": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(q)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r368": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(r)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r369": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(r)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r37": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.3,4)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r370": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920"
  },
  "r371": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921"
  },
  "r372": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=21916913&loc=d3e273930-122802"
  },
  "r373": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6412939&loc=d3e15145-114933"
  },
  "r374": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963"
  },
  "r375": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Subparagraph": "(c)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964"
  },
  "r376": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964"
  },
  "r377": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "70",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942"
  },
  "r378": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=d3e29149-114947"
  },
  "r379": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(d)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.8)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r380": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948"
  },
  "r381": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "715",
   "URI": "http://asc.fasb.org/topic&trid=2235017"
  },
  "r382": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=123468992&loc=d3e4534-113899"
  },
  "r383": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901"
  },
  "r384": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901"
  },
  "r385": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901"
  },
  "r386": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r387": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(3)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r388": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r389": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r39": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226024-175313"
  },
  "r390": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r391": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r392": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(i)-(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r393": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r394": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iv)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r395": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iv)(3)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r396": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(i)-(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r397": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r398": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r399": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r4": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765"
  },
  "r40": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226049-175313"
  },
  "r400": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(3)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r401": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r402": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r403": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r404": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r405": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r406": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r407": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r408": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r409": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)(iii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r41": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313"
  },
  "r410": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)(iv)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r411": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r412": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(1)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r413": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r414": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r415": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901"
  },
  "r416": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r417": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(f)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r418": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r419": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(g)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r42": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580"
  },
  "r420": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 14.D.2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809"
  },
  "r421": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 14.F)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809"
  },
  "r422": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=122142933&loc=d3e11149-113907"
  },
  "r423": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=122142933&loc=d3e11178-113907"
  },
  "r424": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "40",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244644&loc=d3e17400-113927"
  },
  "r425": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929"
  },
  "r426": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(c)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929"
  },
  "r427": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(d)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929"
  },
  "r428": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929"
  },
  "r429": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929"
  },
  "r43": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580"
  },
  "r430": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "718",
   "URI": "http://asc.fasb.org/topic&trid=2228938"
  },
  "r431": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "35",
   "Subparagraph": "(a)",
   "Topic": "720",
   "URI": "http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848"
  },
  "r432": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123427490&loc=d3e32247-109318"
  },
  "r433": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123427490&loc=d3e32280-109318"
  },
  "r434": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123427490&loc=d3e31931-109318"
  },
  "r435": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32672-109319"
  },
  "r436": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319"
  },
  "r437": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319"
  },
  "r438": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319"
  },
  "r439": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319"
  },
  "r44": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580"
  },
  "r440": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32840-109319"
  },
  "r441": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319"
  },
  "r442": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319"
  },
  "r443": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319"
  },
  "r444": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32847-109319"
  },
  "r445": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319"
  },
  "r446": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319"
  },
  "r447": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319"
  },
  "r448": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319"
  },
  "r449": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319"
  },
  "r45": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580"
  },
  "r450": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319"
  },
  "r451": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319"
  },
  "r452": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319"
  },
  "r453": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319"
  },
  "r454": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)(2)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277"
  },
  "r455": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)(3)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277"
  },
  "r456": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 6.I.5.Q1)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817"
  },
  "r457": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 6.I.7)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817"
  },
  "r458": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.7)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817"
  },
  "r459": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.Fact.1)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580"
  },
  "r460": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.Fact.2)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817"
  },
  "r461": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.Fact.4)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817"
  },
  "r462": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.C)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817"
  },
  "r463": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123586238&loc=d3e39076-109324"
  },
  "r464": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324"
  },
  "r465": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324"
  },
  "r466": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "270",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338"
  },
  "r467": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331"
  },
  "r468": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "740",
   "URI": "http://asc.fasb.org/topic&trid=2144680"
  },
  "r469": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116873149&loc=d3e923-111674"
  },
  "r47": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580"
  },
  "r470": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116873149&loc=d3e923-111674"
  },
  "r471": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683"
  },
  "r472": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=123454820&loc=SL4569643-111683"
  },
  "r473": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988"
  },
  "r474": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988"
  },
  "r475": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r476": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r477": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r478": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c),(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r479": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685"
  },
  "r48": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e689-108580"
  },
  "r480": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685"
  },
  "r481": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4J",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4591551-111686"
  },
  "r482": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4591552-111686"
  },
  "r483": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "810",
   "URI": "http://asc.fasb.org/topic&trid=2197479"
  },
  "r484": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(4)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959"
  },
  "r485": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.DD)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=116879480&loc=d3e417888-122833"
  },
  "r486": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=116879480&loc=d3e417888-122833"
  },
  "r487": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "20",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=124256753&loc=SL5864739-113975"
  },
  "r488": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978"
  },
  "r489": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(f)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=123477628&loc=d3e90205-114008"
  },
  "r49": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL34724391-108580"
  },
  "r490": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(b)(2)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011"
  },
  "r491": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(e)(3)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011"
  },
  "r492": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(e)(4)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011"
  },
  "r493": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011"
  },
  "r494": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r495": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r496": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r497": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r498": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(1)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r499": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r5": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6812-107765"
  },
  "r50": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580"
  },
  "r500": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r501": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258"
  },
  "r502": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258"
  },
  "r503": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258"
  },
  "r504": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258"
  },
  "r505": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740"
  },
  "r506": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=123594809&loc=d3e13220-108610"
  },
  "r507": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611"
  },
  "r508": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611"
  },
  "r509": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=123594938&loc=d3e13476-108611"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580"
  },
  "r510": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612"
  },
  "r511": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=123444420&loc=d3e33268-110906"
  },
  "r512": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900"
  },
  "r513": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r514": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r515": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r516": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(d)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r517": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r518": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901"
  },
  "r519": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580"
  },
  "r520": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
  },
  "r521": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399"
  },
  "r522": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629"
  },
  "r523": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980"
  },
  "r524": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r525": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r526": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r527": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r528": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r529": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580"
  },
  "r530": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864"
  },
  "r531": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864"
  },
  "r532": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "850",
   "URI": "http://asc.fasb.org/topic&trid=2122745"
  },
  "r533": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "852",
   "URI": "http://asc.fasb.org/extlink&oid=124433192&loc=SL2890621-112765"
  },
  "r534": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "852",
   "URI": "http://asc.fasb.org/extlink&oid=124433192&loc=SL2890621-112765"
  },
  "r535": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "852",
   "URI": "http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766"
  },
  "r536": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "855",
   "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662"
  },
  "r537": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)(i)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r538": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)(ii)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r539": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580"
  },
  "r540": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r541": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r542": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r543": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r544": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r545": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r546": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r547": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(cc)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r548": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r549": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(5)(ii)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e557-108580"
  },
  "r550": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r551": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r552": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r553": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r554": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r555": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r556": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719"
  },
  "r557": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728"
  },
  "r558": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729"
  },
  "r559": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL116659661-227067"
  },
  "r560": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(c)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729"
  },
  "r561": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729"
  },
  "r562": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729"
  },
  "r563": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "50",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745"
  },
  "r564": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "50",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745"
  },
  "r565": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746"
  },
  "r566": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(b)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746"
  },
  "r567": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(d)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746"
  },
  "r568": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r569": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067"
  },
  "r570": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r571": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r572": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(4)(i)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r573": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(4)(ii)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r574": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(5)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746"
  },
  "r575": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r576": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r577": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r578": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r579": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(4)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067"
  },
  "r580": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(5)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r581": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(6)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r582": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(a)(7)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r583": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(b)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r584": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(d)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r585": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(e)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r586": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(e)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r587": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Subparagraph": "(e)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746"
  },
  "r588": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "860",
   "URI": "http://asc.fasb.org/topic&trid=2197590"
  },
  "r589": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "910",
   "URI": "http://asc.fasb.org/extlink&oid=123353855&loc=SL119991595-234733"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067"
  },
  "r590": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.L)",
   "Topic": "924",
   "URI": "http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856"
  },
  "r591": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959"
  },
  "r592": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e61929-109447"
  },
  "r593": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e61929-109447"
  },
  "r594": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e62059-109447"
  },
  "r595": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e62059-109447"
  },
  "r596": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e62395-109447"
  },
  "r597": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e62395-109447"
  },
  "r598": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e62479-109447"
  },
  "r599": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e62479-109447"
  },
  "r6": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581"
  },
  "r600": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=SL6807758-109447"
  },
  "r601": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=SL6807758-109447"
  },
  "r602": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(c)(1)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e61872-109447"
  },
  "r603": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(c)(2)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=123377692&loc=d3e61872-109447"
  },
  "r604": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "20",
   "Topic": "940",
   "URI": "http://asc.fasb.org/extlink&oid=123384075&loc=d3e41242-110953"
  },
  "r605": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "320",
   "Topic": "940",
   "URI": "http://asc.fasb.org/subtopic&trid=2176304"
  },
  "r606": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(1))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r607": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(10))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r608": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(11))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r609": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(1)(e))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868656-224227"
  },
  "r610": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(16))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r611": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r612": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(6))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r613": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(7)(e)(1)(i))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r614": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.1,2,3)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r615": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.12)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r616": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.13(3)(a))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r617": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r618": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r619": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.3)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(210.5-03(11))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r620": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.4)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r621": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.7(e))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r622": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.7)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r623": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r624": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(15))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r625": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r626": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r627": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(26))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r628": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(27))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r629": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.1)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(10))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r630": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.1-5)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r631": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.10)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r632": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.11)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r633": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.12)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r634": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.13(h))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r635": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.13)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r636": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.14)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r637": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.2)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r638": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.4)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r639": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.6)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(20))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r640": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.7,8)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r641": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.9)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r642": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123398031&loc=d3e60009-112784"
  },
  "r643": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Subparagraph": "(c)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123398031&loc=d3e60009-112784"
  },
  "r644": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.9-05(b)(2))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884"
  },
  "r645": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62557-112803"
  },
  "r646": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803"
  },
  "r647": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(a)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803"
  },
  "r648": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803"
  },
  "r649": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(c)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(21))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r650": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(d)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803"
  },
  "r651": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803"
  },
  "r652": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62652-112803"
  },
  "r653": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/subtopic&trid=2209399"
  },
  "r654": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "325",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809"
  },
  "r655": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=124429447&loc=SL124453093-239630"
  },
  "r656": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "405",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818"
  },
  "r657": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "405",
   "Subparagraph": "(c)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818"
  },
  "r658": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "405",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818"
  },
  "r659": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "470",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(24))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r660": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(a)(1)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r661": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(a)(2)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r662": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r663": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(c)(1)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r664": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(c)(2)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r665": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(e)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r666": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958569-112826"
  },
  "r667": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826"
  },
  "r668": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958573-112826"
  },
  "r669": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1F",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958575-112826"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(25))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r670": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "942",
   "URI": "http://asc.fasb.org/topic&trid=2209208"
  },
  "r671": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r672": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(10))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r673": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(12))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r674": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(3))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r675": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r676": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(25))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r677": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r678": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.15(a))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r679": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(18))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(7)(c))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r680": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(19))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r681": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(22))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r682": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(23))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r683": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(3)(d))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r684": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r685": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r686": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(9))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r687": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.3(a))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r688": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "310",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=123605502&loc=d3e21286-158488"
  },
  "r689": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "310",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=123605502&loc=d3e21310-158488"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(b)(4))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r690": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "310",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=123605549&loc=d3e21493-158490"
  },
  "r691": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438"
  },
  "r692": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(d)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124506351&loc=SL117782755-158439"
  },
  "r693": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124504033&loc=SL117783719-158441"
  },
  "r694": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29F",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124504033&loc=SL117819544-158441"
  },
  "r695": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r696": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r697": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r698": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r699": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(i)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r7": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(13))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.2(a),(d))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r700": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(ii)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r701": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(iii)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r702": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(iv)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r703": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(h)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r704": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(h)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641"
  },
  "r705": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473"
  },
  "r706": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=66023616&loc=SL35737432-115832"
  },
  "r707": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r708": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r709": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.4)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227"
  },
  "r710": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r711": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r712": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r713": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r714": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r715": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010"
  },
  "r716": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13D(Column B)(Footnote 2))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010"
  },
  "r717": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13D(Column C)(Footnote 2))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010"
  },
  "r718": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column A))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010"
  },
  "r719": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column B))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585"
  },
  "r720": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column C))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010"
  },
  "r721": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column D))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010"
  },
  "r722": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "320",
   "Topic": "946",
   "URI": "http://asc.fasb.org/subtopic&trid=2324412"
  },
  "r723": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "310",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004"
  },
  "r724": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "310",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=121578458&loc=d3e48700-111005"
  },
  "r725": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "310",
   "Subparagraph": "(SX 210.12-29(Footnote 4))",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014"
  },
  "r726": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "440",
   "Subparagraph": "(a)",
   "Topic": "954",
   "URI": "http://asc.fasb.org/extlink&oid=6491277&loc=d3e6429-115629"
  },
  "r727": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Subparagraph": "(d)",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916"
  },
  "r728": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916"
  },
  "r729": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585"
  },
  "r730": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "310",
   "Subparagraph": "(c)",
   "Topic": "976",
   "URI": "http://asc.fasb.org/extlink&oid=6497875&loc=d3e22274-108663"
  },
  "r731": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "310",
   "Subparagraph": "(b)",
   "Topic": "978",
   "URI": "http://asc.fasb.org/extlink&oid=123360121&loc=d3e27327-108691"
  },
  "r732": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r733": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r734": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-23"
  },
  "r735": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r736": {
   "Name": "Form 10-K",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "310"
  },
  "r737": {
   "Name": "Form 20-F",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "220",
   "Subsection": "f"
  },
  "r738": {
   "Name": "Form 40-F",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "240",
   "Subsection": "f"
  },
  "r739": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a),(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585"
  },
  "r740": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1402"
  },
  "r741": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(b)",
   "Publisher": "SEC",
   "Section": "1402",
   "Subparagraph": "(1)"
  },
  "r742": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(b)",
   "Publisher": "SEC",
   "Section": "1402",
   "Subparagraph": "(2)"
  },
  "r743": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(b)",
   "Publisher": "SEC",
   "Section": "1402",
   "Subparagraph": "(3)"
  },
  "r744": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(c)",
   "Publisher": "SEC",
   "Section": "1402",
   "Subparagraph": "(2)(i)"
  },
  "r745": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(c)",
   "Publisher": "SEC",
   "Section": "1402",
   "Subparagraph": "(2)(ii)"
  },
  "r746": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(c)",
   "Publisher": "SEC",
   "Section": "1402",
   "Subparagraph": "(2)(iii)"
  },
  "r747": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(b)",
   "Publisher": "SEC",
   "Section": "1403"
  },
  "r748": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1404"
  },
  "r749": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(b)",
   "Publisher": "SEC",
   "Section": "1404"
  },
  "r75": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a),(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585"
  },
  "r750": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1405",
   "Subparagraph": "(1)"
  },
  "r751": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1405",
   "Subparagraph": "(2)"
  },
  "r752": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1405",
   "Subparagraph": "(3)"
  },
  "r753": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1405",
   "Subparagraph": "(4)"
  },
  "r754": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(c)",
   "Publisher": "SEC",
   "Section": "1405"
  },
  "r755": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Publisher": "SEC",
   "Section": "1406"
  },
  "r756": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1406"
  },
  "r757": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(1)"
  },
  "r758": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(2)"
  },
  "r759": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(3)"
  },
  "r76": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585"
  },
  "r760": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(4)"
  },
  "r761": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(a)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(5)"
  },
  "r762": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(c)",
   "Publisher": "SEC",
   "Section": "1406"
  },
  "r763": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(d)",
   "Publisher": "SEC",
   "Section": "1406"
  },
  "r764": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(e)",
   "Publisher": "SEC",
   "Section": "1406"
  },
  "r765": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(f)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(1)"
  },
  "r766": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(f)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(2)"
  },
  "r767": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(f)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(2)(i)"
  },
  "r768": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(f)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(2)(i)(ii)"
  },
  "r769": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(f)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(2)(i)(iii)"
  },
  "r77": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585"
  },
  "r770": {
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Paragraph": "(f)",
   "Publisher": "SEC",
   "Section": "1406",
   "Subparagraph": "(2)(i)(iv)"
  },
  "r771": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r772": {
   "Name": "Securities Act",
   "Number": "230",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r773": {
   "Name": "Securities Act",
   "Number": "7A",
   "Publisher": "SEC",
   "Section": "B",
   "Subsection": "2"
  },
  "r774": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)(3)(iii)(01)",
   "Topic": "848"
  },
  "r775": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)(3)(iii)(03)",
   "Topic": "848"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585"
  },
  "r79": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585"
  },
  "r8": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(14))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585"
  },
  "r82": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3000-108585"
  },
  "r83": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3461-108585"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(17))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3095-108585"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4273-108586"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4297-108586"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586"
  }
 },
 "version": "2.1"
}
