{ "instance": { "fusb-10q_20210930.htm": { "axisCustom": 0, "axisStandard": 36, "contextCount": 486, "dts": { "calculationLink": { "local": [ "fusb-20210930_cal.xml" ] }, "definitionLink": { "local": [ "fusb-20210930_def.xml" ] }, "inline": { "local": [ "fusb-10q_20210930.htm" ] }, "labelLink": { "local": [ "fusb-20210930_lab.xml" ] }, "presentationLink": { "local": [ "fusb-20210930_pre.xml" ] }, "schema": { "local": [ "fusb-20210930.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", "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd", "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd", "https://xbrl.sec.gov/country/2021/country-2021.xsd", "https://xbrl.sec.gov/currency/2021/currency-2021.xsd", "https://xbrl.sec.gov/dei/2021/dei-2021.xsd", "https://xbrl.sec.gov/exch/2021/exch-2021.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", "https://xbrl.sec.gov/naics/2021/naics-2021.xsd", "https://xbrl.sec.gov/sic/2021/sic-2021.xsd", "https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "https://xbrl.fasb.org/srt/2021/elts/srt-types-2021-01-31.xsd", "https://xbrl.fasb.org/srt/2021/elts/srt-roles-2021-01-31.xsd", "https://xbrl.sec.gov/stpr/2021/stpr-2021.xsd", "https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd", "https://xbrl.fasb.org/us-gaap/2021/elts/us-types-2021-01-31.xsd", "https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd", "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd" ] } }, "elementCount": 666, "entityCount": 1, "hidden": { "http://fasb.org/us-gaap/2021-01-31": 2, "http://www.firstusbank.com/20210930": 4, "http://xbrl.sec.gov/dei/2021": 5, "total": 11 }, "keyCustom": 59, "keyStandard": 421, "memberCustom": 35, "memberStandard": 53, "nsprefix": "fusb", "nsuri": "http://www.firstusbank.com/20210930", "report": { "R1": { "firstAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "document", "isDefault": "true", "longName": "100000 - Document - Document and Entity Information", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation", "shortName": "Document and Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NatureOfOperations", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100090 - Disclosure - General", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGeneral", "shortName": "General", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NatureOfOperations", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100100 - Disclosure - Basis of Presentation", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentation", "shortName": "Basis of Presentation", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100110 - Disclosure - Restructuring Charges", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringCharges", "shortName": "Restructuring Charges", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R13": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100120 - Disclosure - Investment Securities", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecurities", "shortName": "Investment Securities", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100130 - Disclosure - Loans and Allowance for Loan and Lease Losses", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLosses", "shortName": "Loans and Allowance for Loan and Lease Losses", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RealEstateOwnedTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100140 - Disclosure - Other Real Estate Owned and Repossessed Assets", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssets", "shortName": "Other Real Estate Owned and Repossessed Assets", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RealEstateOwnedTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100150 - Disclosure - Goodwill and Other Intangible Assets", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets", "shortName": "Goodwill and Other Intangible Assets", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ShortTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100160 - Disclosure - Short-term Borrowings", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureShortTermBorrowings", "shortName": "Short-term Borrowings", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ShortTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100170 - Disclosure - Income Taxes", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureIncomeTaxes", "shortName": "Income Taxes", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100180 - Disclosure - Deferred Compensation Plans", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlans", "shortName": "Deferred Compensation Plans", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndDueFromBanks", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100010 - Statement - Interim Condensed Consolidated Balance Sheets (Current Period Unaudited)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited", "shortName": "Interim Condensed Consolidated Balance Sheets (Current Period Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndDueFromBanks", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100190 - Disclosure - Stock Awards", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwards", "shortName": "Stock Awards", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeasesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100200 - Disclosure - Leases", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeases", "shortName": "Leases", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeasesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100210 - Disclosure - Derivative Financial Instruments", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstruments", "shortName": "Derivative Financial Instruments", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SegmentReportingDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100220 - Disclosure - Segment Reporting", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReporting", "shortName": "Segment Reporting", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SegmentReportingDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OtherOperatingIncomeAndExpenseTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100230 - Disclosure - Other Operating Income and Expense", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpense", "shortName": "Other Operating Income and Expense", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OtherOperatingIncomeAndExpenseTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100240 - Disclosure - Guarantees, Commitments and Contingencies", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingencies", "shortName": "Guarantees, Commitments and Contingencies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100250 - Disclosure - Fair Value of Financial Instruments", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstruments", "shortName": "Fair Value of Financial Instruments", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PriorPeriodReclassificationAdjustmentDescription", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100260 - Disclosure - Basis of Presentation (Policies)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationPolicies", "shortName": "Basis of Presentation (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PriorPeriodReclassificationAdjustmentDescription", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "p", "us-gaap:EarningsPerSharePolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100270 - Disclosure - Basis of Presentation (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationTables", "shortName": "Basis of Presentation (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:EarningsPerSharePolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R29": { "firstAnchor": { "ancestors": [ "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100280 - Disclosure - Restructuring Charges (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesTables", "shortName": "Restructuring Charges (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R3": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableAllowance", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100020 - Statement - Interim Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parenthetical)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical", "shortName": "Interim Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "INF", "lang": null, "name": "us-gaap:CommonStockParOrStatedValuePerShare", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" } }, "R30": { "firstAnchor": { "ancestors": [ "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:ScheduleOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100290 - Disclosure - Investment Securities (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesTables", "shortName": "Investment Securities (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:ScheduleOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100300 - Disclosure - Loans and Allowance for Loan and Lease Losses (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables", "shortName": "Loans and Allowance for Loan and Lease Losses (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R32": { "firstAnchor": { "ancestors": [ "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:OtherRealEstateAssetsAcquiredInForeclosureRollForwardTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100310 - Disclosure - Other Real Estate Owned and Repossessed Assets (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsTables", "shortName": "Other Real Estate Owned and Repossessed Assets (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:OtherRealEstateAssetsAcquiredInForeclosureRollForwardTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100320 - Disclosure - Goodwill and Other Intangible Assets (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsTables", "shortName": "Goodwill and Other Intangible Assets (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFederalHomeLoanBankAdvancesByBranchOfFHLBBankTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100330 - Disclosure - Borrowings (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsTables", "shortName": "Borrowings (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFederalHomeLoanBankAdvancesByBranchOfFHLBBankTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100340 - Disclosure - Stock Awards (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsTables", "shortName": "Stock Awards (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "us-gaap:LesseeOperatingLeasesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LeaseCostTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100350 - Disclosure - Leases (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesTables", "shortName": "Leases (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:LesseeOperatingLeasesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LeaseCostTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionNominalAmountAndFairValueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100360 - Disclosure - Derivative Financial Instruments (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsTables", "shortName": "Derivative Financial Instruments (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionNominalAmountAndFairValueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R38": { "firstAnchor": { "ancestors": [ "p", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100370 - Disclosure - Segment Reporting (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingTables", "shortName": "Segment Reporting (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R39": { "firstAnchor": { "ancestors": [ "us-gaap:OtherOperatingIncomeAndExpenseTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:ScheduleOfOtherOperatingIncomeByComponentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100380 - Disclosure - Other Operating Income and Expense (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseTables", "shortName": "Other Operating Income and Expense (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:OtherOperatingIncomeAndExpenseTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "fusb:ScheduleOfOtherOperatingIncomeByComponentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestAndFeeIncomeLoansAndLeases", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100030 - Statement - Interim Condensed Consolidated Statements of Operations (Unaudited)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited", "shortName": "Interim Condensed Consolidated Statements of Operations (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestAndFeeIncomeLoansAndLeases", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "p", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueOffBalanceSheetRisksTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100390 - Disclosure - Guarantees, Commitments and Contingencies (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesTables", "shortName": "Guarantees, Commitments and Contingencies (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueOffBalanceSheetRisksTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100400 - Disclosure - Fair Value of Financial Instruments (Tables)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables", "shortName": "Fair Value of Financial Instruments (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "p", "us-gaap:NatureOfOperations", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:NumberOfReportableSegments", "reportCount": 1, "unitRef": "U_fusbSegment", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100410 - Disclosure - General - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGeneralAdditionalInformationDetails", "shortName": "General - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R43": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:EarningsPerSharePolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "0", "first": true, "lang": null, "name": "us-gaap:WeightedAverageNumberOfSharesOutstandingBasic", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100420 - Disclosure - Basis of Presentation - Basic and Diluted Net Income Per Share (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails", "shortName": "Basis of Presentation - Basic and Diluted Net Income Per Share (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:EarningsPerSharePolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "0", "first": true, "lang": null, "name": "us-gaap:WeightedAverageNumberOfSharesOutstandingBasic", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R44": { "firstAnchor": { "ancestors": [ "p", "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapRestructuringCostAndReserveAxis_fusbAcceptanceLoanCompanyMember_20210901_20210930", "decimals": "INF", "first": true, "lang": null, "name": "fusb:RestructuringAndRelatedCostNumberOfOfficeClosed", "reportCount": 1, "unique": true, "unitRef": "U_fusbBranch", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100430 - Disclosure - Restructuring Charges - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "shortName": "Restructuring Charges - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapRestructuringCostAndReserveAxis_fusbAcceptanceLoanCompanyMember_20210901_20210930", "decimals": "INF", "first": true, "lang": null, "name": "fusb:RestructuringAndRelatedCostNumberOfOfficeClosed", "reportCount": 1, "unique": true, "unitRef": "U_fusbBranch", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapRestructuringCostAndReserveAxis_fusbAcceptanceLoanCompanyMember_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:SeveranceCosts1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100440 - Disclosure - Restructuring Charges - Scheduled of Restructuring Charges (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails", "shortName": "Restructuring Charges - Scheduled of Restructuring Charges (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapRestructuringCostAndReserveAxis_fusbAcceptanceLoanCompanyMember_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:SeveranceCosts1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityTableTextBlock", "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100450 - Disclosure - Investment Securities - Available-for-Sale and Held-to-Maturity (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "shortName": "Investment Securities - Available-for-Sale and Held-to-Maturity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityTableTextBlock", "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100460 - Disclosure - Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "shortName": "Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R48": { "firstAnchor": { "ancestors": [ "p", "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100470 - Disclosure - Investment Securities - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails", "shortName": "Investment Securities - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100480 - Disclosure - Investment Securities - Securities in Continuous Unrealized Loss Position (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails", "shortName": "Investment Securities - Securities in Continuous Unrealized Loss Position (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R5": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100040 - Statement - Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited", "shortName": "Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R50": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100490 - Disclosure - Loans and Allowance for Loan Losses - Schedule of Loan Portfolio (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "shortName": "Loans and Allowance for Loan Losses - Schedule of Loan Portfolio (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:LoansAndLeasesReceivableDeferredIncome", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R51": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100500 - Disclosure - Loans and Allowance for Loan Losses - Schedule of Loan Portfolio (Parenthetical) (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails", "shortName": "Loans and Allowance for Loan Losses - Schedule of Loan Portfolio (Parenthetical) (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "link:footnote", "span", "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFinancingReceivablePortfolioSegmentAxis_fusbEquipmentFinancingLeasesMember_20210930", "decimals": "-5", "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:LoansPledgedAsCollateral", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100510 - Disclosure - Loans and Allowance for Loan Losses - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "shortName": "Loans and Allowance for Loan Losses - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "lang": null, "name": "us-gaap:LoansAndLeasesReceivableRelatedParties", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R53": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20201231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableAllowance", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100520 - Disclosure - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "shortName": "Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R54": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100530 - Disclosure - Loans and Allowance for Loan Losses - Loans By Credit Quality Indicators (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "shortName": "Loans and Allowance for Loan Losses - Loans By Credit Quality Indicators (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FinancingReceivableCreditQualityIndicatorsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapInternalCreditAssessmentAxis_us-gaapPassMember_us-gaapStatementBusinessSegmentsAxis_fusbFirstUnitedSecurityBankMember_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R55": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100540 - Disclosure - Loans and Allowance for Loan Losses - Aging Analysis of Past Due Loans (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "shortName": "Loans and Allowance for Loan Losses - Aging Analysis of Past Due Loans (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:PastDueFinancingReceivablesTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "4", "lang": null, "name": "fusb:PercentageOfLoansAndLeasesPastDue", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R56": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100550 - Disclosure - Loans and Allowance for Loan Losses - Non-accruing Loans (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "shortName": "Loans and Allowance for Loan Losses - Non-accruing Loans (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R57": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ImpairedFinancingReceivablesTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100560 - Disclosure - Loans and Allowance for Loan Losses - Impaired Loans (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "shortName": "Loans and Allowance for Loan Losses - Impaired Loans (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ImpairedFinancingReceivablesTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R58": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableModificationsNumberOfContracts2", "reportCount": 1, "unitRef": "U_fusbLoan", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100570 - Disclosure - Loans and Allowance for Loan Losses - Loans Modified in a Troubled Debt Restructuring (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "shortName": "Loans and Allowance for Loan Losses - Loans Modified in a Troubled Debt Restructuring (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R59": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20201231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:RealEstateAcquiredThroughForeclosure", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100580 - Disclosure - Other Real Estate Owned and Repossessed Assets - Summary of Foreclosed Property Activity (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "shortName": "Other Real Estate Owned and Repossessed Assets - Summary of Foreclosed Property Activity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:OtherRealEstateAssetsAcquiredInForeclosureRollForwardTableTextBlock", "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20191231", "decimals": "-3", "lang": null, "name": "us-gaap:RealEstateAcquiredThroughForeclosure", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R6": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100050 - Statement - Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical", "shortName": "Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R60": { "firstAnchor": { "ancestors": [ "p", "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "fusb:ForeclosedRealEstateOwnedFairValueLessDisposalCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100590 - Disclosure - Other Real Estate Owned and Repossessed Assets - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsAdditionalInformationDetails", "shortName": "Other Real Estate Owned and Repossessed Assets - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "fusb:ForeclosedRealEstateOwnedFairValueLessDisposalCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R61": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:OtherRealEstateAssetsAcquiredInForeclosureRollForwardTableTextBlock", "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProceedsFromSaleOfOtherRealEstate", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100600 - Disclosure - Other Real Estate Owned and Repossessed Assets - Summary of Repossessed Assets Activity (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails", "shortName": "Other Real Estate Owned and Repossessed Assets - Summary of Repossessed Assets Activity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:RealEstateOwnedTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_srtMortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_fusbRepossessedAssetsMember_20201231", "decimals": "-3", "lang": null, "name": "us-gaap:OtherForeclosedAssets", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R62": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:Goodwill", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100610 - Disclosure - Goodwill and Other Intangible Assets - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails", "shortName": "Goodwill and Other Intangible Assets - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis_us-gaapCoreDepositsMember_20181231", "decimals": "-5", "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R63": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:Goodwill", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100620 - Disclosure - Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails", "shortName": "Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R64": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100630 - Disclosure - Goodwill and Other Intangible Assets - Estimated Remaining Amortization Expense (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails", "shortName": "Goodwill and Other Intangible Assets - Estimated Remaining Amortization Expense (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R65": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ShortTermBorrowings", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100640 - Disclosure - Borrowings - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "shortName": "Borrowings - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "p", "td", "tr", "table", "div", "us-gaap:ShortTermDebtTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:FederalFundsPurchased", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R66": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFinancialInstrumentAxis_us-gaapUnusedLinesOfCreditMember_us-gaapShortTermDebtTypeAxis_fusbCorrespondentBanksMember_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresDescriptionOfCollateralPledged", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100650 - Disclosure - Borrowings - Schedule of Available Unused Lines of Credit (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails", "shortName": "Borrowings - Schedule of Available Unused Lines of Credit (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFinancialInstrumentAxis_us-gaapUnusedLinesOfCreditMember_us-gaapShortTermDebtTypeAxis_fusbCorrespondentBanksMember_20210101_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresDescriptionOfCollateralPledged", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R67": { "firstAnchor": { "ancestors": [ "span", "p", "td", "tr", "table", "div", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100660 - Disclosure - Borrowings - Schedule of Available Unused Lines of Credit (Parenthetical) (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditParentheticalDetails", "shortName": "Borrowings - Schedule of Available Unused Lines of Credit (Parenthetical) (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "span", "p", "td", "tr", "table", "div", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R68": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:IncomeTaxExpenseBenefit", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100670 - Disclosure - Income Taxes - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails", "shortName": "Income Taxes - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "3", "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R69": { "firstAnchor": { "ancestors": [ "p", "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100680 - Disclosure - Deferred Compensation Plans - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails", "shortName": "Deferred Compensation Plans - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100060 - Statement - Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited", "shortName": "Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R70": { "firstAnchor": { "ancestors": [ "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross", "reportCount": 1, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100690 - Disclosure - Stock Awards - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails", "shortName": "Stock Awards - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R71": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20201231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100700 - Disclosure - Stock Awards - Stock Option Activity (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails", "shortName": "Stock Awards - Stock Option Activity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20201231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R72": { "firstAnchor": { "ancestors": [ "p", "us-gaap:LesseeOperatingLeasesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeaseRenewalTerm", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100710 - Disclosure - Leases - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails", "shortName": "Leases - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:LesseeOperatingLeasesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeaseRenewalTerm", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R73": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:LeaseCostTableTextBlock", "us-gaap:LesseeOperatingLeasesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LeaseCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100720 - Disclosure - Leases - Components of Lease Expense (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails", "shortName": "Leases - Components of Lease Expense (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:LeaseCostTableTextBlock", "us-gaap:LesseeOperatingLeasesTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LeaseCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R74": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100730 - Disclosure - Leases - Future Minimum Operating Lease Payments (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails", "shortName": "Leases - Future Minimum Operating Lease Payments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R75": { "firstAnchor": { "ancestors": [ "span", "p", "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100750 - Disclosure - Derivative Financial Instruments - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails", "shortName": "Derivative Financial Instruments - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "p", "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R76": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionNominalAmountAndFairValueTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapHedgingDesignationAxis_us-gaapDesignatedAsHedgingInstrumentMember_20210101_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DerivativeGainLossOnDerivativeNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100760 - Disclosure - Derivative Financial Instruments - Schedule of Notional Amount and Fair Value of Derivative Instruments Included on Company's Consolidated Balance Sheets on a net Basis (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails", "shortName": "Derivative Financial Instruments - Schedule of Notional Amount and Fair Value of Derivative Instruments Included on Company's Consolidated Balance Sheets on a net Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionNominalAmountAndFairValueTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapHedgingDesignationAxis_us-gaapDesignatedAsHedgingInstrumentMember_20210101_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DerivativeGainLossOnDerivativeNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R77": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AssetsUnderManagementCarryingAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100770 - Disclosure - Derivative Financial Instruments - Schedule of Cumulative Basis Adjustments For Fair Value Hedges (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesDetails", "shortName": "Derivative Financial Instruments - Schedule of Cumulative Basis Adjustments For Fair Value Hedges (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AssetsUnderManagementCarryingAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R78": { "firstAnchor": { "ancestors": [ "link:footnote", "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "fusb:AmortizedCostBasisOfClosedPortfoliosUsedInHedgingRelationships", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100780 - Disclosure - Derivative Financial Instruments - Schedule of Cumulative Basis Adjustments For Fair Value Hedges (Parenthetical) (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesParentheticalDetails", "shortName": "Derivative Financial Instruments - Schedule of Cumulative Basis Adjustments For Fair Value Hedges (Parenthetical) (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "link:footnote", "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "fusb:AmortizedCostBasisOfClosedPortfoliosUsedInHedgingRelationships", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R79": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfDerivativeInstrumentsEffectOnStatementOfOperationsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DerivativeInstrumentsIncomeStatementLocationOfGainOrLossReclassifiedFromAccumulatedOCI", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100790 - Disclosure - Derivative Financial Instruments - Schedule of Hedging Derivative Instruments' Effect on Company's Consolidated Statement of Operations (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails", "shortName": "Derivative Financial Instruments - Schedule of Hedging Derivative Instruments' Effect on Company's Consolidated Statement of Operations (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfDerivativeInstrumentsEffectOnStatementOfOperationsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DerivativeInstrumentsIncomeStatementLocationOfGainOrLossReclassifiedFromAccumulatedOCI", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:CommonStockDividendsPerShareDeclared", "reportCount": 1, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100070 - Statement - Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnauditedParenthetical", "shortName": "Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": null }, "R80": { "firstAnchor": { "ancestors": [ "p", "us-gaap:NatureOfOperations", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:NumberOfReportableSegments", "reportCount": 1, "unitRef": "U_fusbSegment", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100800 - Disclosure - Segment Reporting - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingAdditionalInformationDetails", "shortName": "Segment Reporting - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R81": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestIncomeExpenseNet", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100810 - Disclosure - Segment Reporting - Results for Reportable Segments (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "shortName": "Segment Reporting - Results for Reportable Segments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:DepreciationAndAmortization", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R82": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfOtherOperatingIncomeByComponentTextBlock", "us-gaap:OtherOperatingIncomeAndExpenseTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:BankOwnedLifeInsuranceIncome", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100820 - Disclosure - Other Operating Income and Expense - Other Operating Income (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails", "shortName": "Other Operating Income and Expense - Other Operating Income (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "fusb:ScheduleOfOtherOperatingIncomeByComponentTextBlock", "us-gaap:OtherOperatingIncomeAndExpenseTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:BankOwnedLifeInsuranceIncome", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R83": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:RevenueRemainingPerformanceObligation", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100830 - Disclosure - Other Operating Income and Expense - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails", "shortName": "Other Operating Income and Expense - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_srtProductOrServiceAxis_fusbServiceAndOtherChargesOnDepositAccountsMortgageFeesFromSecondaryMarketTransactionsAtTheBankATMFeeIncomeAndOtherNoninterestIncomeMember_20210701_20210930", "decimals": "-5", "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R84": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfOtherOperatingCostAndExpenseByComponentTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:SuppliesAndPostageExpense", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100840 - Disclosure - Other Operating Income and Expense - Other Operating Expense (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails", "shortName": "Other Operating Income and Expense - Other Operating Expense (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfOtherOperatingCostAndExpenseByComponentTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210701_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:SuppliesAndPostageExpense", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R85": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapLossContingenciesByNatureOfContingencyAxis_us-gaapStandbyLettersOfCreditMember_20201231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100850 - Disclosure - Guarantees, Commitments and Contingencies - Summary of Commitment and Contingent Liabilities (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails", "shortName": "Guarantees, Commitments and Contingencies - Summary of Commitment and Contingent Liabilities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapLossContingenciesByNatureOfContingencyAxis_us-gaapStandbyLettersOfCreditMember_20201231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R86": { "firstAnchor": { "ancestors": [ "us-gaap:SelfInsuranceReserve", "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:SelfInsuranceReserve", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100860 - Disclosure - Guarantees, Commitments and Contingencies - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesAdditionalInformationDetails", "shortName": "Guarantees, Commitments and Contingencies - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "us-gaap:SelfInsuranceReserve", "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:SelfInsuranceReserve", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R87": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LiabilitiesFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100870 - Disclosure - Fair Value of Financial Instruments - Additional Information (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails", "shortName": "Fair Value of Financial Instruments - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LiabilitiesFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R88": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100880 - Disclosure - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "shortName": "Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_us-gaapFinancialInstrumentAxis_us-gaapResidentialMortgageBackedSecuritiesMember_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R89": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel3Member_20210930", "decimals": "-3", "first": true, "lang": null, "name": "fusb:ImpairedLoansFairValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100890 - Disclosure - Fair Value of Financial Instruments - Assets Measured at Fair Value on Non-recurring Basis (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "shortName": "Fair Value of Financial Instruments - Assets Measured at Fair Value on Non-recurring Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_20210930", "decimals": "-3", "lang": null, "name": "fusb:ImpairedLoansFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100080 - Statement - Interim Condensed Consolidated Statements of Cash Flows (Unaudited)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited", "shortName": "Interim Condensed Consolidated Statements of Cash Flows (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210101_20210930", "decimals": "-3", "lang": null, "name": "fusb:DepreciationAndAmortizationOfPropertyPlantAndEquipmentAndComputerPrograms", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R90": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel3Member_20210930", "decimals": "-3", "first": true, "lang": null, "name": "fusb:ImpairedLoansFairValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100900 - Disclosure - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "shortName": "Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_srtRangeAxis_srtWeightedAverageMember_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel3Member_us-gaapMeasurementInputTypeAxis_us-gaapMeasurementInputComparabilityAdjustmentMember_20210930", "decimals": "1", "lang": null, "name": "fusb:ImpairedLoansMeasurementInput", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R91": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_20210930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100910 - Disclosure - Fair Value of Financial Instruments - Estimated Fair Value and Related Carrying or Notional Amounts of Financial Instruments (Details)", "role": "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails", "shortName": "Fair Value of Financial Instruments - Estimated Fair Value and Related Carrying or Notional Amounts of Financial Instruments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueByBalanceSheetGroupingTextBlock", "ix:continuation", "body", "html" ], "baseRef": "fusb-10q_20210930.htm", "contextRef": "C_0000717806_us-gaapFairValueByMeasurementBasisAxis_us-gaapCarryingReportedAmountFairValueDisclosureMember_20210930", "decimals": "-3", "lang": null, "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } } }, "segmentCount": 92, "tag": { "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_CoverAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Cover page.", "label": "Cover [Abstract]" } } }, "localname": "CoverAbstract", "nsuri": "http://xbrl.sec.gov/dei/2021", "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "gMonthDayItemType" }, "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "dateItemType" }, "dei_DocumentQuarterlyReport": { "auth_ref": [ "r682" ], "lang": { "en-us": { "role": { "documentation": "Boolean flag that is true only for a form used as an quarterly report.", "label": "Document Quarterly Report", "terseLabel": "Document Quarterly Report" } } }, "localname": "DocumentQuarterlyReport", "nsuri": "http://xbrl.sec.gov/dei/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_DocumentTransitionReport": { "auth_ref": [ "r683" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "submissionTypeItemType" }, "dei_EntityAddressAddressLine1": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Address Line 1 such as Attn, Building Name, Street Name", "label": "Entity Address Address Line1", "terseLabel": "Entity Address, Address Line One" } } }, "localname": "EntityAddressAddressLine1", "nsuri": "http://xbrl.sec.gov/dei/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "stateOrProvinceItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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]", "terseLabel": "Entity" } } }, "localname": "EntityDomain", "nsuri": "http://xbrl.sec.gov/dei/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "fileNumberItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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 Country Code", "terseLabel": "Entity Incorporation, State or Country Code" } } }, "localname": "EntityIncorporationStateCountryCode", "nsuri": "http://xbrl.sec.gov/dei/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "edgarStateCountryItemType" }, "dei_EntityInteractiveDataCurrent": { "auth_ref": [ "r700" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityShellCompany": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityTaxIdentificationNumber": { "auth_ref": [ "r684" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "employerIdItemType" }, "dei_LegalEntityAxis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The set of legal entities associated with a report.", "label": "Legal Entity [Axis]", "terseLabel": "Legal Entity" } } }, "localname": "LegalEntityAxis", "nsuri": "http://xbrl.sec.gov/dei/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_Security12bTitle": { "auth_ref": [ "r680" ], "lang": { "en-us": { "role": { "documentation": "Title of a 12(b) registered security.", "label": "Security12b Title", "terseLabel": "Title of 12(b) Security" } } }, "localname": "Security12bTitle", "nsuri": "http://xbrl.sec.gov/dei/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "securityTitleItemType" }, "dei_SecurityExchangeName": { "auth_ref": [ "r681" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "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/2021", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "tradingSymbolItemType" }, "fusb_AcceptanceLoanCompanyMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents a segment of the company.", "label": "Acceptance Loan Company [Member]", "terseLabel": "ALC [Member]" } } }, "localname": "AcceptanceLoanCompanyMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "fusb_AmortizedCostBasisOfClosedPortfoliosUsedInHedgingRelationships": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amortized cost basis of closed portfolios used in hedging relationships.", "label": "Amortized Cost Basis Of Closed Portfolios Used In Hedging Relationships", "terseLabel": "Amortized cost basis of closed portfolios used in hedging relationships" } } }, "localname": "AmortizedCostBasisOfClosedPortfoliosUsedInHedgingRelationships", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "fusb_AmountOfDefermentLoan": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of deferment loan.", "label": "Amount Of Deferment Loan", "terseLabel": "Amount Of Deferment Loan" } } }, "localname": "AmountOfDefermentLoan", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_AutoClubRevenue": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10030.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Auto Club revenue.", "label": "Auto Club Revenue", "terseLabel": "Auto Club revenue" } } }, "localname": "AutoClubRevenue", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "fusb_AvailableFundLinesFromCorrespondentBanks": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Available fund lines from correspondent banks.", "label": "Available Fund Lines From Correspondent Banks", "terseLabel": "Available Fund Lines From Correspondent Banks" } } }, "localname": "AvailableFundLinesFromCorrespondentBanks", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_BranchRetailMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents branch retail loans.", "label": "Branch Retail [Member]", "terseLabel": "Branch Retail [Member]" } } }, "localname": "BranchRetailMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_BusinessDevelopmentAndTravel": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10040.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Business development and travel.", "label": "Business Development And Travel", "terseLabel": "Travel and business development" } } }, "localname": "BusinessDevelopmentAndTravel", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ClosedBranchAssetsTransferredToOtherRealEstate": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Closed branch assets transferred to other real estate.", "label": "Closed Branch Assets Transferred To Other Real Estate", "terseLabel": "Closed branch assets transferred to other real estate" } } }, "localname": "ClosedBranchAssetsTransferredToOtherRealEstate", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_CollectionAndRecoveries": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10050.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Collection and recoveries.", "label": "Collection And Recoveries", "terseLabel": "Collection and recoveries" } } }, "localname": "CollectionAndRecoveries", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "fusb_CommercialAndIndustrialLoansAndLeasesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Commercial and industrial loans and leases.", "label": "Commercial And Industrial Loans And Leases [Member]", "terseLabel": "Commercial and Industrial Loans and Leases [Member]" } } }, "localname": "CommercialAndIndustrialLoansAndLeasesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_CommercialAndIndustrialLoansMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to commercial and industrial loans.", "label": "Commercial And Industrial Loans [Member]", "terseLabel": "Commercial and Industrial Loans [Member]" } } }, "localname": "CommercialAndIndustrialLoansMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails" ], "xbrltype": "domainItemType" }, "fusb_CommitmentsToExtendCredit1Member": { "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 Credit1 [Member]", "terseLabel": "Commitments to Extend Credit [Member]" } } }, "localname": "CommitmentsToExtendCredit1Member", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "fusb_ComputerServicesExpense": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10080.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Computer services expense", "label": "Computer Services Expense", "terseLabel": "Computer services" } } }, "localname": "ComputerServicesExpense", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_ConstructionLandDevelopmentAndOtherLandLoansMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to construction, land development and other land loans.", "label": "Construction Land Development And Other Land Loans [Member]", "terseLabel": "Construction, Land Development and Other Land Loans [Member]" } } }, "localname": "ConstructionLandDevelopmentAndOtherLandLoansMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_CorrespondentBanksMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Correspondent Banks [Member]", "label": "Correspondent Banks [Member]", "terseLabel": "Correspondent Banks [Member]" } } }, "localname": "CorrespondentBanksMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "domainItemType" }, "fusb_CreditInsuranceCommissionsAndFees": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10020.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Credit insurance commissions and fees.", "label": "Credit Insurance Commissions And Fees", "terseLabel": "Credit insurance commissions and fees" } } }, "localname": "CreditInsuranceCommissionsAndFees", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "fusb_CumulativeBasisAdjustmentsAssociatedWithHedgingRelationships": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Cumulative basis adjustments associated with hedging relationships.", "label": "Cumulative Basis Adjustments Associated With Hedging Relationships", "terseLabel": "Cumulative basis adjustments associated with hedging relationships" } } }, "localname": "CumulativeBasisAdjustmentsAssociatedWithHedgingRelationships", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "fusb_DebtInstrumentFeePercentage": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Debt instrument fee percentage.", "label": "Debt Instrument Fee Percentage", "terseLabel": "Loan fee percentage" } } }, "localname": "DebtInstrumentFeePercentage", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "fusb_DeferredPrincipalBalanceOfLoanReducedPercentage": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Deferred principal balance of loan reduced.", "label": "Deferred Principal Balance Of Loan Reduced Percentage", "terseLabel": "Deferred principal balance of loan reduced percentage" } } }, "localname": "DeferredPrincipalBalanceOfLoanReducedPercentage", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "fusb_DepreciationAndAmortizationOfPropertyPlantAndEquipmentAndComputerPrograms": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10190.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Depreciation and amortization of property, plant, and equipment and computer programs.", "label": "Depreciation And Amortization Of Property Plant And Equipment And Computer Programs", "terseLabel": "Depreciation and amortization" } } }, "localname": "DepreciationAndAmortizationOfPropertyPlantAndEquipmentAndComputerPrograms", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_DirectConsumerMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Direct consumer member.", "label": "Direct Consumer [Member]", "terseLabel": "Direct Consumer [Member]" } } }, "localname": "DirectConsumerMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_EquipmentFinancingLeasesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Equipment financing leases member", "label": "Equipment Financing Leases [Member]", "terseLabel": "Equipment Financing Leases [Member]" } } }, "localname": "EquipmentFinancingLeasesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails" ], "xbrltype": "domainItemType" }, "fusb_FederalFundsSoldFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value portion of federal funds sold.", "label": "Federal Funds Sold Fair Value Disclosure", "terseLabel": "Federal funds sold" } } }, "localname": "FederalFundsSoldFairValueDisclosure", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "fusb_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresExcessOfCollateralAvailableToUtilizeAdditionalCredit": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of collateral pledged in excess available to utilize additional credit.", "label": "Federal Home Loan Bank Advances General Debt Obligations Disclosures Excess Of Collateral Available To Utilize Additional Credit", "terseLabel": "Collateral pledged in excess available to utilize additional credit" } } }, "localname": "FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresExcessOfCollateralAvailableToUtilizeAdditionalCredit", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "fusb_FinancingReceivableRestructuringRecordedInvestmentWithNonaccrualStatus": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Financing receivable restructuring recorded investment with non accrual status.", "label": "Financing Receivable Restructuring Recorded Investment With Nonaccrual Status", "terseLabel": "Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status" } } }, "localname": "FinancingReceivableRestructuringRecordedInvestmentWithNonaccrualStatus", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_FirstUnitedSecurityBankMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents a business segment of the company.", "label": "First United Security Bank [Member]", "terseLabel": "FUSB [Member]" } } }, "localname": "FirstUnitedSecurityBankMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "fusb_FiveYearTermLoanMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Five year term loan.", "label": "Five Year Term Loan [Member]", "terseLabel": "Five Year Term Loan [Member]" } } }, "localname": "FiveYearTermLoanMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_FixedAssetValuationAdjustments": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails": { "order": 10030.0, "parentTag": "us-gaap_RestructuringCharges", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fixed asset valuation adjustments.", "label": "Fixed Asset Valuation Adjustments", "terseLabel": "Fixed asset valuation adjustments" } } }, "localname": "FixedAssetValuationAdjustments", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ForeclosedAssetsAcquiredInSettlementOfLoans": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Represents the amount of foreclosed assets acquired in settlement of loans.", "label": "Foreclosed Assets Acquired In Settlement Of Loans", "terseLabel": "Assets acquired in settlement of loans" } } }, "localname": "ForeclosedAssetsAcquiredInSettlementOfLoans", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_ForeclosedRealEstateOtherExpenseNetOfGainOrLossOnSale": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10110.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Foreclosed real estate other expense net of gain or loss on sale.", "label": "Foreclosed Real Estate Other Expense Net Of Gain Or Loss On Sale", "terseLabel": "Other real estate/foreclosure expense, net" } } }, "localname": "ForeclosedRealEstateOtherExpenseNetOfGainOrLossOnSale", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ForeclosedRealEstateOwnedFairValueLessDisposalCosts": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The fair value less estimated costs to sell of foreclosed residential real estate held by the Company as of the balance sheet date.", "label": "Foreclosed Real Estate Owned Fair Value Less Disposal Costs", "terseLabel": "Foreclosed real estate owned, fair value less disposal costs" } } }, "localname": "ForeclosedRealEstateOwnedFairValueLessDisposalCosts", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ForwardInterestRateSwapContractsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Forward interest rate swap contracts member.", "label": "Forward Interest Rate Swap Contracts [Member]", "terseLabel": "Forward Interest Rate Swap Contracts [Member]" } } }, "localname": "ForwardInterestRateSwapContractsMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_GainOnSalesOfPremisesAndEquipmentAndOtherAssets": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10060.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Gain on sales of premises and equipment and other assets.", "label": "Gain On Sales Of Premises And Equipment And Other Assets", "terseLabel": "Gain on sales of premises and equipment and other assets" } } }, "localname": "GainOnSalesOfPremisesAndEquipmentAndOtherAssets", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "fusb_GainsLossesOnSalesOfPremisesEquipmentAndOtherRealEstateHeldForSale": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10260.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Gains losses on sales of premises equipment and other real estate held for sale.", "label": "Gains Losses On Sales Of Premises Equipment And Other Real Estate Held For Sale", "negatedLabel": "Net (gain) loss on premises and equipment and other real estate" } } }, "localname": "GainsLossesOnSalesOfPremisesEquipmentAndOtherRealEstateHeldForSale", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_GoodwillAndOtherIntangibleAssetTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Goodwill and other intangible asset.", "label": "Goodwill And Other Intangible Asset [Table]", "terseLabel": "Goodwill And Other Intangible Asset [Table]" } } }, "localname": "GoodwillAndOtherIntangibleAssetTable", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "fusb_GoodwillAndOtherIntangibleAssetsLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Goodwill and other intangible assets.", "label": "Goodwill And Other Intangible Assets [Line Items]", "terseLabel": "Goodwill And Other Intangible Assets [Line Items]" } } }, "localname": "GoodwillAndOtherIntangibleAssetsLineItems", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "fusb_ImpairedLoansFairValue": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value portion of impaired loans by an entity as a result of past transactions or events.", "label": "Impaired Loans Fair Value", "terseLabel": "Impaired loans" } } }, "localname": "ImpairedLoansFairValue", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ImpairedLoansMeasurementInput": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Fair value portion of impaired loans by an entity as a result of past transactions or events.", "label": "Impaired Loans Measurement Input", "terseLabel": "Impaired loans" } } }, "localname": "ImpairedLoansMeasurementInput", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" ], "xbrltype": "decimalItemType" }, "fusb_IndirectSalesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents indirect sales of consumer loans.", "label": "Indirect Sales [Member]", "terseLabel": "Indirect Sales [Member]" } } }, "localname": "IndirectSalesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_InterestAndFeesOnLoansMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest and fees on Loans member.", "label": "Interest And Fees On Loans [Member]", "terseLabel": "Interest and Fees on Loans [Member]" } } }, "localname": "InterestAndFeesOnLoansMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "domainItemType" }, "fusb_InterestIncomeFromExternalCustomers": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Interest income from external customers.", "label": "Interest Income From External Customers", "terseLabel": "Total interest income from external customers" } } }, "localname": "InterestIncomeFromExternalCustomers", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "fusb_InterestIncomeRecorded": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Interest income recorded.", "label": "Interest Income Recorded", "terseLabel": "Interest Income Recorded" } } }, "localname": "InterestIncomeRecorded", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_InterestOnDepositsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest on deposits member.", "label": "Interest On Deposits [Member]", "terseLabel": "Interest on Deposits [Member]" } } }, "localname": "InterestOnDepositsMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "domainItemType" }, "fusb_InterestOnShortTermBorrowingsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest on short-term borrowings member.", "label": "Interest On Short Term Borrowings [Member]", "terseLabel": "Interest on Short-Term Borrowings [Member]" } } }, "localname": "InterestOnShortTermBorrowingsMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "domainItemType" }, "fusb_InterestRateSwapsRelatedToFHLBAdvancesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest rate swaps related to FHLB advances.", "label": "Interest Rate Swaps Related To F H L B Advances [Member]", "terseLabel": "Interest Rate Swaps Related to FHLB Advances [Member]" } } }, "localname": "InterestRateSwapsRelatedToFHLBAdvancesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "fusb_InterestRateSwapsRelatedToFixedRateCommercialRealEstateLoansMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest rate swaps related to fixed rate commercial real estate loans.", "label": "Interest Rate Swaps Related To Fixed Rate Commercial Real Estate Loans [Member]", "terseLabel": "Interest Rate Swaps Related to Fixed Rate Commercial Real Estate Loans [Member]" } } }, "localname": "InterestRateSwapsRelatedToFixedRateCommercialRealEstateLoansMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "fusb_InterestRateSwapsRelatedToVariableRateMoneyMarketDepositAccountsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest rate swaps related to variable-rate money market deposit accounts.", "label": "Interest Rate Swaps Related To Variable Rate Money Market Deposit Accounts [Member]", "terseLabel": "Interest Rate Swaps Related to Variable-Rate Money Market Deposit Accounts [Member]" } } }, "localname": "InterestRateSwapsRelatedToVariableRateMoneyMarketDepositAccountsMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "fusb_InvestmentIntoCapitalSurplus": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Investment into capital surplus.", "label": "Investment Into Capital Surplus", "terseLabel": "Investment into capital surplus" } } }, "localname": "InvestmentIntoCapitalSurplus", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_LesseeOperatingLeasePeriodOfOptionToTerminate": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The period of time in which the lessee holds the option to terminate an operating lease, in 'PnYnMnDTnHnMnS' format. For example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Lessee Operating Lease Period Of Option To Terminate", "terseLabel": "Lessee, Operating Lease, Period of Option to Terminate" } } }, "localname": "LesseeOperatingLeasePeriodOfOptionToTerminate", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "fusb_LesseeOperatingLeaseRemainingTermOfContract": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The remaining term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Lessee Operating Lease Remaining Term Of Contract", "terseLabel": "Lessee, Operating Lease, Remaining Term of Contract" } } }, "localname": "LesseeOperatingLeaseRemainingTermOfContract", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "fusb_LoansModifiedInATroubledDebtRestructuringIndividuallyEvaluatedForImpairmentPrincipalBalanceThreshold": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Loans modifies in a troubled debt restructuring individually evaluated for impairment principal balance threshold.", "label": "Loans Modified In A Troubled Debt Restructuring Individually Evaluated For Impairment Principal Balance Threshold", "terseLabel": "Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold" } } }, "localname": "LoansModifiedInATroubledDebtRestructuringIndividuallyEvaluatedForImpairmentPrincipalBalanceThreshold", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_LossOnSalesOfPremisesAndEquipmentAndOtherAssets": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10090.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Loss on sales of premises and equipment and other assets.", "label": "Loss On Sales Of Premises And Equipment And Other Assets", "terseLabel": "Loss on sales of premises and equipment and other assets" } } }, "localname": "LossOnSalesOfPremisesAndEquipmentAndOtherAssets", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "fusb_MaturityPeriodOfFederalFunds": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Maturity period of federal funds.", "label": "Maturity Period Of Federal Funds", "terseLabel": "Maturity Period of Federal Funds" } } }, "localname": "MaturityPeriodOfFederalFunds", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "fusb_NumberOfCompanies": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of companies borrowed PPP loan.", "label": "Number Of Companies", "terseLabel": "Number of companies" } } }, "localname": "NumberOfCompanies", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "fusb_NumberOfFullTimeEmploymentPositionsEliminated": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of full time employment positions eliminated.", "label": "Number Of Full Time Employment Positions Eliminated", "terseLabel": "Number of full-time employment positions eliminated" } } }, "localname": "NumberOfFullTimeEmploymentPositionsEliminated", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "fusb_NumberOfLoansToSmallBusiness": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of loans to small business.", "label": "Number Of Loans To Small Business", "terseLabel": "Number of loans to small businesses" } } }, "localname": "NumberOfLoansToSmallBusiness", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "fusb_OmnibusIncentivePlanMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The omnibus incentive plan.", "label": "Omnibus Incentive Plan [Member]", "terseLabel": "Omnibus Incentive Plan [Member]" } } }, "localname": "OmnibusIncentivePlanMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_OtherDerivativeLiabilitiesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other Liabilities - derivatives [Member]", "label": "Other Derivative Liabilities [Member]", "terseLabel": "Other Liabilities [Member]" } } }, "localname": "OtherDerivativeLiabilitiesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "fusb_OtherIncomeATMFees": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10040.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Other income ATM fees.", "label": "Other Income A T M Fees", "terseLabel": "ATM fee income" } } }, "localname": "OtherIncomeATMFees", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "fusb_OtherRealEstateAndOtherAssetsAcquiredInForeclosureLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other real estate and other assets acquired in foreclosure.", "label": "Other Real Estate And Other Assets Acquired In Foreclosure [Line Items]", "terseLabel": "Other Real Estate And Other Assets Acquired In Foreclosure [Line Items]" } } }, "localname": "OtherRealEstateAndOtherAssetsAcquiredInForeclosureLineItems", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "stringItemType" }, "fusb_OtherRealEstateAndOtherAssetsAcquiredInForeclosureTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other real estate and other assets acquired in foreclosure.", "label": "Other Real Estate And Other Assets Acquired In Foreclosure [Table]", "terseLabel": "Other Real Estate And Other Assets Acquired In Foreclosure [Table]" } } }, "localname": "OtherRealEstateAndOtherAssetsAcquiredInForeclosureTable", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "stringItemType" }, "fusb_OtherRealEstateAssetsAcquiredInForeclosureRollForwardTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other real estate assets acquired in foreclosure roll forward.", "label": "Other Real Estate Assets Acquired In Foreclosure Roll Forward Table [Text Block]", "terseLabel": "Summary of Foreclosed Property Activity" } } }, "localname": "OtherRealEstateAssetsAcquiredInForeclosureRollForwardTableTextBlock", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsTables" ], "xbrltype": "textBlockItemType" }, "fusb_OtherRealEstateAssetsAcquiredInRepossessionsTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other real estate assets acquired in repossessions.", "label": "Other Real Estate Assets Acquired In Repossessions Table [Text Block]", "terseLabel": "Summary of Repossessed Assets Activity" } } }, "localname": "OtherRealEstateAssetsAcquiredInRepossessionsTableTextBlock", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsTables" ], "xbrltype": "textBlockItemType" }, "fusb_OtherRealEstateGrossGains": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails": { "order": 10010.0, "parentTag": "fusb_OtherRealEstateNetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Other real estate gross gains.", "label": "Other Real Estate Gross Gains", "terseLabel": "Gross gains" } } }, "localname": "OtherRealEstateGrossGains", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "fusb_OtherRealEstateGrossLosses": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails": { "order": 10020.0, "parentTag": "fusb_OtherRealEstateNetIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Other real estate gross losses.", "label": "Other Real Estate Gross Losses", "negatedLabel": "Gross losses" } } }, "localname": "OtherRealEstateGrossLosses", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "fusb_OtherRealEstateNetIncomeLoss": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Other real estate net income loss.", "label": "Other Real Estate Net Income Loss", "totalLabel": "Net gains (losses)" } } }, "localname": "OtherRealEstateNetIncomeLoss", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "fusb_OtherRealEstateOtherAssetsFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Other real estate and other assets held-for-sale.", "label": "Other Real Estate Other Assets Fair Value Disclosure", "verboseLabel": "OREO and other assets held-for-sale" } } }, "localname": "OtherRealEstateOtherAssetsFairValueDisclosure", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "fusb_OtherRealEstateOtherAssetsMeasurementInput": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other real estate other assets measurement input.", "label": "Other Real Estate Other Assets Measurement Input", "verboseLabel": "OREO and other assets held-for-sale" } } }, "localname": "OtherRealEstateOtherAssetsMeasurementInput", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" ], "xbrltype": "decimalItemType" }, "fusb_OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarningsInterestRate": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Other than temporary impairment loss debt securities available for sale recognized in earnings interest rate.", "label": "Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings Interest Rate", "terseLabel": "Other than temporary impairment loss debt securities available for sale interest rate" } } }, "localname": "OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarningsInterestRate", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "fusb_PPPLoansMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "PPP loans member", "label": "P P P Loans [Member]", "terseLabel": "PPP Loans [Member]" } } }, "localname": "PPPLoansMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails" ], "xbrltype": "domainItemType" }, "fusb_PassAndCriticizedMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Pass And Criticized [Member]", "label": "Pass And Criticized [Member]", "terseLabel": "Pass And Criticized [Member}" } } }, "localname": "PassAndCriticizedMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "fusb_PaycheckProtectionProgramMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Paycheck protection program.", "label": "Paycheck Protection Program [Member]", "terseLabel": "Paycheck Protection Program [Member]" } } }, "localname": "PaycheckProtectionProgramMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_PercentageOfLoanPortfolio": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage of loan portfolio.", "label": "Percentage Of Loan Portfolio", "terseLabel": "Percentage of Loan Portfolio" } } }, "localname": "PercentageOfLoanPortfolio", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "fusb_PercentageOfLoansAndLeases": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage of loans and leases.", "label": "Percentage Of Loans And Leases", "terseLabel": "As a percentage of total loans" } } }, "localname": "PercentageOfLoansAndLeases", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "percentItemType" }, "fusb_PercentageOfLoansAndLeasesCurrent": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage of loans and leases current.", "label": "Percentage Of Loans And Leases Current", "terseLabel": "As a percentage of total loans, Current" } } }, "localname": "PercentageOfLoansAndLeasesCurrent", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "percentItemType" }, "fusb_PercentageOfLoansAndLeasesPastDue": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage of loans and leases past due.", "label": "Percentage Of Loans And Leases Past Due", "terseLabel": "As a percentage of total loans, Total Past Due" } } }, "localname": "PercentageOfLoansAndLeasesPastDue", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "percentItemType" }, "fusb_PerformingAndNonPerformingMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Performing And Non Performing [Member].", "label": "Performing And Non Performing [Member]", "terseLabel": "Performing And Non Performing [Member]" } } }, "localname": "PerformingAndNonPerformingMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "fusb_ProceedsFromSaleOfPremisesAndEquipmentAndOtherRealEstate": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10150.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Proceeds from sale of premises and equipment and other real estate.", "label": "Proceeds From Sale Of Premises And Equipment And Other Real Estate", "terseLabel": "Proceeds from the sale of premises and equipment and other real estate" } } }, "localname": "ProceedsFromSaleOfPremisesAndEquipmentAndOtherRealEstate", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_ProvisionReductionInReserveForLoanLosses": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": 10040.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Provision reduction in reserve for loan losses.", "label": "Provision Reduction In Reserve For Loan Losses", "verboseLabel": "Provision" } } }, "localname": "ProvisionReductionInReserveForLoanLosses", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "fusb_RealEstate1Member": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to real estate.", "label": "Real Estate1 [Member]", "terseLabel": "Real Estate [Member]" } } }, "localname": "RealEstate1Member", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_RealEstateOwnedTransferToLoan": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Real estate owned, transfer to loan.", "label": "Real Estate Owned Transfer To Loan", "terseLabel": "Transfers from loans" } } }, "localname": "RealEstateOwnedTransferToLoan", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ReductionInDeferredPrincipalBalanceOfLoan": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Reduction in deferred principal balance of loan.", "label": "Reduction In Deferred Principal Balance Of Loan", "terseLabel": "Deferred principal balance of loan reduced" } } }, "localname": "ReductionInDeferredPrincipalBalanceOfLoan", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "fusb_RepossessedAssetsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Repossessed Assets.", "label": "Repossessed Assets [Member]", "terseLabel": "Repossessed Assets [Member]" } } }, "localname": "RepossessedAssetsMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "domainItemType" }, "fusb_RestructuredLoanModifiedThroughExtendedMaturityAndPaymentScheduleModificationMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Member stands for restructured loan modified through extended maturity and payment schedule modification.", "label": "Restructured Loan Modified Through Extended Maturity And Payment Schedule Modification [Member]", "terseLabel": "Restructured Loan Modified through Extended Maturity and Payment Schedule Modification [Member]" } } }, "localname": "RestructuredLoanModifiedThroughExtendedMaturityAndPaymentScheduleModificationMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_RestructuringAndRelatedCostNumberOfOfficeClosed": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents number of office closed during period for restructuring and related cost.", "label": "Restructuring And Related Cost Number Of Office Closed", "terseLabel": "Number of office closed" } } }, "localname": "RestructuringAndRelatedCostNumberOfOfficeClosed", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "fusb_ScheduleOfDerivativeInstrumentsEffectOnStatementOfOperationsTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Schedule of derivative instruments effect on statement of operations.", "label": "Schedule Of Derivative Instruments Effect On Statement Of Operations Table [Text Block]", "terseLabel": "Schedule of Hedging Derivative Instruments' Effect on Company's Consolidated Statement of Operations" } } }, "localname": "ScheduleOfDerivativeInstrumentsEffectOnStatementOfOperationsTableTextBlock", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "fusb_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionNominalAmountAndFairValueTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the location, nominal amount and fair value amounts of derivative instruments (and non-derivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.", "label": "Schedule Of Derivative Instruments In Statement Of Financial Position Nominal Amount And Fair Value Table [Text Block]", "terseLabel": "Schedule of Notional Amount and Fair Value of Derivative Instruments Included on Company's Consolidated Balance Sheets on a net Basis" } } }, "localname": "ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionNominalAmountAndFairValueTableTextBlock", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "fusb_ScheduleOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of investment securities available for sale and held to maturity.", "label": "Schedule Of Investment Securities Available For Sale And Held To Maturity Table [Text Block]", "terseLabel": "Schedule of Investment Securities Available-for-Sale and Held-to-Maturity" } } }, "localname": "ScheduleOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityTableTextBlock", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "fusb_ScheduleOfOtherOperatingIncomeByComponentTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Schedule of other operating income by component.", "label": "Schedule Of Other Operating Income By Component [Text Block]", "terseLabel": "Other Operating Income" } } }, "localname": "ScheduleOfOtherOperatingIncomeByComponentTextBlock", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseTables" ], "xbrltype": "textBlockItemType" }, "fusb_SecuredBy1To4FamilyResidentialPropertiesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to loans secured by 1-to-4-family residential properties.", "label": "Secured By1 To4 Family Residential Properties [Member]", "terseLabel": "Secured by 1-4 Family Residential Properties [Member]" } } }, "localname": "SecuredBy1To4FamilyResidentialPropertiesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_SecuredByMultifamilyResidentialPropertiesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to loans secured by multi-family residential properties.", "label": "Secured By Multifamily Residential Properties [Member]", "terseLabel": "Secured By Multi family Residential Properties [Member]" } } }, "localname": "SecuredByMultifamilyResidentialPropertiesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_SecuredByNonfarmNonresidentialPropertiesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to loans secured by non-farm, non-residential properties.", "label": "Secured By Nonfarm Nonresidential Properties [Member]", "terseLabel": "Secured By Non-farm Non residential Properties [Member]" } } }, "localname": "SecuredByNonfarmNonresidentialPropertiesMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "fusb_ServiceAndOtherChargesOnDepositAccountsMortgageFeesFromSecondaryMarketTransactionsAtTheBankATMFeeIncomeAndOtherNoninterestIncomeMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents service and other charges on deposit accounts, mortgage fees from secondary market transactions at the Bank, ATM fee income and other non-interest income.", "label": "Service And Other Charges On Deposit Accounts Mortgage Fees From Secondary Market Transactions At The Bank A T M Fee Income And Other Noninterest Income [Member]", "terseLabel": "Service and Other Charges on Deposit Accounts, Mortgage Fees From Secondary Market Transactions at The Bank ATM Fee Income and Other Noninterest Income [Member]" } } }, "localname": "ServiceAndOtherChargesOnDepositAccountsMortgageFeesFromSecondaryMarketTransactionsAtTheBankATMFeeIncomeAndOtherNoninterestIncomeMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_StandbyPerformanceLettersOfCreditMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information pertaining to standby performance letters of credit.", "label": "Standby Performance Letters Of Credit [Member]", "terseLabel": "Standby Performance Letters of Credit [Member]" } } }, "localname": "StandbyPerformanceLettersOfCreditMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "fusb_TerminationOfTechnologyContracts": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails": { "order": 10040.0, "parentTag": "us-gaap_RestructuringCharges", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Termination of technology contracts.", "label": "Termination Of Technology Contracts", "terseLabel": "Termination of technology contracts" } } }, "localname": "TerminationOfTechnologyContracts", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "monetaryItemType" }, "fusb_ThePeoplesBankMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Represents information regarding The Peoples Bank.", "label": "The Peoples Bank [Member]", "terseLabel": "The Peoples Bank [Member]" } } }, "localname": "ThePeoplesBankMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_TreasuryStockReissuanceAsCompensation": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Represents reissuance of treasury stock as compensation.", "label": "Treasury Stock Reissuance As Compensation", "terseLabel": "Reissuance of treasury stock as compensation" } } }, "localname": "TreasuryStockReissuanceAsCompensation", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "fusb_TwoYearTermLoanMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Two year term loan.", "label": "Two Year Term Loan [Member]", "terseLabel": "Two Year Term Loan [Member]" } } }, "localname": "TwoYearTermLoanMember", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "fusb_WireTransferFees": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10050.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Wire transfer fees.", "label": "Wire Transfer Fees", "terseLabel": "Wire transfer fees" } } }, "localname": "WireTransferFees", "nsuri": "http://www.firstusbank.com/20210930", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "srt_ConsolidationItemsAxis": { "auth_ref": [ "r100", "r136", "r149", "r150", "r151", "r152", "r154", "r156", "r160", "r324", "r325", "r326", "r327", "r328", "r329", "r331", "r332", "r334", "r336", "r337" ], "lang": { "en-us": { "role": { "label": "Consolidation Items [Axis]", "terseLabel": "Consolidation Items" } } }, "localname": "ConsolidationItemsAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "stringItemType" }, "srt_ConsolidationItemsDomain": { "auth_ref": [ "r100", "r136", "r149", "r150", "r151", "r152", "r154", "r156", "r160", "r324", "r325", "r326", "r327", "r328", "r329", "r331", "r332", "r334", "r336", "r337" ], "lang": { "en-us": { "role": { "label": "Consolidation Items [Domain]", "terseLabel": "Consolidation Items" } } }, "localname": "ConsolidationItemsDomain", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "srt_MaximumMember": { "auth_ref": [ "r341", "r350", "r386", "r389", "r543", "r544", "r545", "r546", "r547", "r548", "r568", "r650", "r652", "r678", "r679" ], "lang": { "en-us": { "role": { "label": "Maximum [Member]", "terseLabel": "Maximum [Member]" } } }, "localname": "MaximumMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_MinimumMember": { "auth_ref": [ "r341", "r350", "r386", "r389", "r543", "r544", "r545", "r546", "r547", "r548", "r568", "r650", "r652", "r678", "r679" ], "lang": { "en-us": { "role": { "label": "Minimum [Member]", "terseLabel": "Minimum [Member]" } } }, "localname": "MinimumMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis": { "auth_ref": [ "r665", "r669", "r670", "r671", "r672", "r673", "r674", "r675", "r676", "r677" ], "lang": { "en-us": { "role": { "label": "Mortgage Loans On Real Estate Description Type Of Property [Axis]", "terseLabel": "Real Estate, Type of Property" } } }, "localname": "MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "stringItemType" }, "srt_MortgageLoansOnRealEstateNamePropertyTypeDomain": { "auth_ref": [ "r669", "r670", "r671", "r672", "r673", "r674", "r675", "r676", "r677" ], "lang": { "en-us": { "role": { "label": "Mortgage Loans On Real Estate Name Property Type [Domain]", "terseLabel": "Real Estate" } } }, "localname": "MortgageLoansOnRealEstateNamePropertyTypeDomain", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "domainItemType" }, "srt_ProductOrServiceAxis": { "auth_ref": [ "r162", "r368", "r370", "r570", "r649", "r651" ], "lang": { "en-us": { "role": { "label": "Product Or Service [Axis]", "terseLabel": "Product and Service" } } }, "localname": "ProductOrServiceAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "stringItemType" }, "srt_ProductsAndServicesDomain": { "auth_ref": [ "r162", "r368", "r370", "r570", "r649", "r651" ], "lang": { "en-us": { "role": { "label": "Products And Services [Domain]", "terseLabel": "Product and Service" } } }, "localname": "ProductsAndServicesDomain", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "domainItemType" }, "srt_RangeAxis": { "auth_ref": [ "r341", "r350", "r376", "r386", "r389", "r543", "r544", "r545", "r546", "r547", "r548", "r568", "r650", "r652", "r678", "r679" ], "lang": { "en-us": { "role": { "label": "Range [Axis]", "terseLabel": "Statistical Measurement" } } }, "localname": "RangeAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "srt_RangeMember": { "auth_ref": [ "r341", "r350", "r376", "r386", "r389", "r543", "r544", "r545", "r546", "r547", "r548", "r568", "r650", "r652", "r678", "r679" ], "lang": { "en-us": { "role": { "label": "Range [Member]", "terseLabel": "Statistical Measurement" } } }, "localname": "RangeMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioForecastMember": { "auth_ref": [ "r110", "r387" ], "lang": { "en-us": { "role": { "label": "Scenario Forecast [Member]", "terseLabel": "Scenario Forecast [Member]" } } }, "localname": "ScenarioForecastMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioUnspecifiedDomain": { "auth_ref": [ "r110", "r115", "r387" ], "lang": { "en-us": { "role": { "label": "Scenario Unspecified [Domain]", "terseLabel": "Scenario" } } }, "localname": "ScenarioUnspecifiedDomain", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_StatementScenarioAxis": { "auth_ref": [ "r110", "r115", "r310", "r387", "r536" ], "lang": { "en-us": { "role": { "label": "Statement Scenario [Axis]", "terseLabel": "Scenario" } } }, "localname": "StatementScenarioAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "srt_WeightedAverageMember": { "auth_ref": [ "r543", "r545", "r548", "r678", "r679" ], "lang": { "en-us": { "role": { "label": "Weighted Average [Member]", "terseLabel": "Weighted Average [Member]" } } }, "localname": "WeightedAverageMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r15", "r40", "r42", "r43", "r638", "r657", "r658" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10050.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "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 (loss), net of tax" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [ "r39", "r43", "r51", "r52", "r53", "r102", "r103", "r104", "r448", "r653", "r654", "r701" ], "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": "Accumulated Other Comprehensive Income [Member]", "terseLabel": "AOCI Attributable to Parent [Member]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_AdditionalPaidInCapitalCommonStock": { "auth_ref": [ "r13" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10040.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.", "label": "Additional Paid In Capital Common Stock", "terseLabel": "Additional paid-in capital" } } }, "localname": "AdditionalPaidInCapitalCommonStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdditionalPaidInCapitalMember": { "auth_ref": [ "r102", "r103", "r104", "r413", "r414", "r415", "r481" ], "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]", "terseLabel": "Additional Paid-in Capital [Member]" } } }, "localname": "AdditionalPaidInCapitalMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "domainItemType" }, "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 cash provided by operating activities:" } } }, "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_AllOtherSegmentsMember": { "auth_ref": [ "r131", "r149", "r150", "r151", "r152", "r154" ], "lang": { "en-us": { "role": { "documentation": "Operating segments classified as other. Excludes intersegment elimination and reconciling items.", "label": "All Other Segments [Member]", "terseLabel": "Other Segments [Member]" } } }, "localname": "AllOtherSegmentsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AllocatedShareBasedCompensationExpense": { "auth_ref": [ "r392", "r411", "r417" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.", "label": "Allocated Share Based Compensation Expense", "terseLabel": "Share-based payment arrangement, expense" } } }, "localname": "AllocatedShareBasedCompensationExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock": { "auth_ref": [ "r175", "r251" ], "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": "Allowance for Loan Losses" } } }, "localname": "AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs": { "auth_ref": [ "r250" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of direct write-downs of accounts receivable charged against the allowance.", "label": "Allowance For Doubtful Accounts Receivable Write Offs", "negatedLabel": "Charge-offs" } } }, "localname": "AllowanceForDoubtfulAccountsReceivableWriteOffs", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts": { "auth_ref": [ "r172" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.", "label": "Allowance For Loan And Lease Loss Recovery Of Bad Debts", "terseLabel": "Recoveries" } } }, "localname": "AllowanceForLoanAndLeaseLossRecoveryOfBadDebts", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNetAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Allowance For Loan And Lease Losses Writeoffs Net [Abstract]" } } }, "localname": "AllowanceForLoanAndLeaseLossesWriteoffsNetAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_AmortizationOfDebtDiscountPremium": { "auth_ref": [ "r66", "r81", "r344", "r510" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10240.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.", "label": "Amortization Of Debt Discount Premium", "terseLabel": "Net amortization of securities" } } }, "localname": "AmortizationOfDebtDiscountPremium", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AmortizationOfDeferredLoanOriginationFeesNet": { "auth_ref": [ "r81", "r197" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments.", "label": "Amortization Of Deferred Loan Origination Fees Net", "terseLabel": "Amortized loan fees" } } }, "localname": "AmortizationOfDeferredLoanOriginationFeesNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AmortizationOfIntangibleAssets": { "auth_ref": [ "r81", "r276", "r281" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10100.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10250.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.", "label": "Amortization Of Intangible Assets", "terseLabel": "Amortization of intangible assets" } } }, "localname": "AmortizationOfIntangibleAssets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_Assets": { "auth_ref": [ "r93", "r144", "r151", "r158", "r246", "r324", "r325", "r326", "r328", "r329", "r330", "r331", "r333", "r335", "r337", "r338", "r444", "r449", "r499", "r532", "r534", "r579", "r635" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "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", "terseLabel": "Total assets", "totalLabel": "Total assets" } } }, "localname": "Assets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Assets [Abstract]", "terseLabel": "ASSETS" } } }, "localname": "AssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsUnderManagementCarryingAmount": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The carrying amount of assets an investment adviser manages on behalf of investors.", "label": "Assets Under Management Carrying Amount", "terseLabel": "Carrying Amount of the Hedged Assets" } } }, "localname": "AssetsUnderManagementCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": { "auth_ref": [ "r211" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10040.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax", "terseLabel": "Available-for-sale, gross unrealized gains" } } }, "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": { "auth_ref": [ "r212" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10050.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax", "negatedLabel": "Available-for-sale, gross unrealized losses" } } }, "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": { "auth_ref": [ "r209", "r265" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "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": "Available For Sale Debt Securities Amortized Cost Basis", "totalLabel": "Available-for-sale, amortized cost" } } }, "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost": { "auth_ref": [ "r216" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10150.0, "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": "Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost", "terseLabel": "Available-for-sale, maturing after five to ten years, amortized cost" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": { "auth_ref": [ "r213", "r216", "r622" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10110.0, "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": "Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value", "terseLabel": "Available-for-sale, maturing after five to ten years, estimated fair value" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost": { "auth_ref": [ "r215" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10140.0, "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": "Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost", "terseLabel": "Available-for-sale, maturing after one to five years, amortized cost" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": { "auth_ref": [ "r213", "r215", "r621" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10100.0, "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": "Available For Sale Securities Debt Maturities After One Through Five Years Fair Value", "terseLabel": "Available-for-sale, maturing after one to five years, estimated fair value" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost": { "auth_ref": [ "r217" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10160.0, "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": "Available For Sale Securities Debt Maturities After Ten Years Amortized Cost", "terseLabel": "Available-for-sale, maturing after ten years, amortized cost" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue": { "auth_ref": [ "r213", "r217", "r623" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10120.0, "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": "Available For Sale Securities Debt Maturities After Ten Years Fair Value", "terseLabel": "Available-for-sale, maturing after ten years, estimated fair value" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost": { "auth_ref": [ "r214" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10130.0, "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": "Available For Sale Securities Debt Maturities Within One Year Amortized Cost", "terseLabel": "Available-for-sale, maturing within one year, amortized cost" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue": { "auth_ref": [ "r213", "r214", "r620" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10090.0, "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": "Available For Sale Securities Debt Maturities Within One Year Fair Value", "terseLabel": "Available-for-sale, maturing within one year, estimated fair value" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtSecurities": { "auth_ref": [ "r205", "r210", "r265", "r583" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10060.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10160.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "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": "Available For Sale Securities Debt Securities", "terseLabel": "Investment securities available-for-sale, at fair value", "totalLabel": "Available-for-sale, amortized cost", "verboseLabel": "Investment securities available-for-sale" } } }, "localname": "AvailableForSaleSecuritiesDebtSecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AwardTypeAxis": { "auth_ref": [ "r394", "r412" ], "lang": { "en-us": { "role": { "documentation": "Information by type of award under share-based payment arrangement.", "label": "Award Type [Axis]", "terseLabel": "Award Type" } } }, "localname": "AwardTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BalanceSheetLocationAxis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Information by location on balance sheet (statement of financial position).", "label": "Balance Sheet Location [Axis]", "terseLabel": "Balance Sheet Location" } } }, "localname": "BalanceSheetLocationAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BalanceSheetLocationDomain": { "auth_ref": [ "r462", "r466" ], "lang": { "en-us": { "role": { "documentation": "Location in the balance sheet (statement of financial position).", "label": "Balance Sheet Location [Domain]", "terseLabel": "Balance Sheet Location" } } }, "localname": "BalanceSheetLocationDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_BankOwnedLifeInsurance": { "auth_ref": [ "r578" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10210.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.", "label": "Bank Owned Life Insurance", "terseLabel": "Cash surrender value of bank-owned life insurance" } } }, "localname": "BankOwnedLifeInsurance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_BankOwnedLifeInsuranceIncome": { "auth_ref": [ "r607" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10010.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.", "label": "Bank Owned Life Insurance Income", "terseLabel": "Bank-owned life insurance" } } }, "localname": "BankOwnedLifeInsuranceIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessAcquisitionAcquireeDomain": { "auth_ref": [ "r385", "r388" ], "lang": { "en-us": { "role": { "documentation": "Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.", "label": "Business Acquisition Acquiree [Domain]", "terseLabel": "Business Acquisition, Acquiree" } } }, "localname": "BusinessAcquisitionAcquireeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_BusinessAcquisitionAxis": { "auth_ref": [ "r385", "r388", "r438", "r439" ], "lang": { "en-us": { "role": { "documentation": "Information by business combination or series of individually immaterial business combinations.", "label": "Business Acquisition [Axis]", "terseLabel": "Business Acquisition" } } }, "localname": "BusinessAcquisitionAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BusinessExitCosts1": { "auth_ref": [ "r81" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails": { "order": 10020.0, "parentTag": "us-gaap_RestructuringCharges", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.", "label": "Business Exit Costs1", "terseLabel": "Lease termination costs" } } }, "localname": "BusinessExitCosts1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CarryingReportedAmountFairValueDisclosureMember": { "auth_ref": [ "r497", "r498" ], "lang": { "en-us": { "role": { "documentation": "Measured as reported on the statement of financial position (balance sheet).", "label": "Carrying Reported Amount Fair Value Disclosure [Member]", "terseLabel": "Reported Value Measurement" } } }, "localname": "CarryingReportedAmountFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r5", "r17", "r83" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10140.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "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", "totalLabel": "Total cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value portion 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.", "label": "Cash And Cash Equivalents Fair Value Disclosure", "terseLabel": "Cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndDueFromBanks": { "auth_ref": [ "r576" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10260.0, "parentTag": "us-gaap_CashAndCashEquivalentsAtCarryingValue", "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": { "auth_ref": [ "r76", "r83", "r90" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for 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", "periodEndLabel": "Cash and cash equivalents, end of period", "periodStartLabel": "Cash and cash equivalents, beginning of period" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": { "auth_ref": [ "r76", "r500" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "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 increase (decrease) in cash and cash equivalents" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashFlowHedgingMember": { "auth_ref": [ "r459" ], "lang": { "en-us": { "role": { "documentation": "Hedge of the exposure to variability in the cash flows of a recognized asset or liability, or of a forecasted transaction, that is attributable to a particular risk.", "label": "Cash Flow Hedging [Member]", "terseLabel": "Cash Flow Hedging [Member]" } } }, "localname": "CashFlowHedgingMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract]", "terseLabel": "Non-cash transactions:" } } }, "localname": "CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition": { "auth_ref": [ "r199", "r200" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.", "label": "Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period Cash Flows Expected To Be Collected At Acquisition", "terseLabel": "Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition" } } }, "localname": "CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommercialMortgageBackedSecuritiesMember": { "auth_ref": [ "r218", "r377" ], "lang": { "en-us": { "role": { "documentation": "Securities collateralized by commercial real estate mortgage loans.", "label": "Commercial Mortgage Backed Securities [Member]", "terseLabel": "Commercial Mortgage Backed Securities [Member]" } } }, "localname": "CommercialMortgageBackedSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "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": [ "r306", "r307", "r308", "r316", "r668" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for commitments and contingencies.", "label": "Commitments And Contingencies Disclosure [Text Block]", "terseLabel": "Guarantees, Commitments and Contingencies" } } }, "localname": "CommitmentsAndContingenciesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingencies" ], "xbrltype": "textBlockItemType" }, "us-gaap_CommonStockDividendsPerShareDeclared": { "auth_ref": [ "r353" ], "lang": { "en-us": { "role": { "documentation": "Aggregate dividends declared during the period for each share of common stock outstanding.", "label": "Common Stock Dividends Per Share Declared", "terseLabel": "Dividends per share" } } }, "localname": "CommonStockDividendsPerShareDeclared", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnauditedParenthetical", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockMember": { "auth_ref": [ "r102", "r103", "r481" ], "lang": { "en-us": { "role": { "documentation": "Stock that is subordinate to all other stock of the issuer.", "label": "Common Stock [Member]", "terseLabel": "Common Stock [Member]" } } }, "localname": "CommonStockMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_CommonStockParOrStatedValuePerShare": { "auth_ref": [ "r12" ], "lang": { "en-us": { "role": { "documentation": "Face amount or stated value per share of common stock.", "label": "Common Stock Par Or Stated Value Per Share", "terseLabel": "Common stock, par value (in dollars per share)" } } }, "localname": "CommonStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r12" ], "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", "terseLabel": "Common stock, shares authorized (in shares)" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesIssued": { "auth_ref": [ "r12" ], "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", "terseLabel": "Common stock, shares issued (in shares)" } } }, "localname": "CommonStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesOutstanding": { "auth_ref": [ "r12", "r352" ], "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 (in shares)" } } }, "localname": "CommonStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r12", "r534" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10030.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "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", "terseLabel": "Common stock, par value $0.01 per share, 10,000,000 shares authorized; 7,634,918 and 7,596,351 shares issued, respectively; 6,218,126 and 6,176,556 shares outstanding, respectively" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommunicationsAndInformationTechnology": { "auth_ref": [ "r64" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10020.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The amount of expense in the period for communications and data processing expense.", "label": "Communications And Information Technology", "terseLabel": "Telephone/data communication" } } }, "localname": "CommunicationsAndInformationTechnology", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CompensationAndEmployeeBenefitPlansTextBlock": { "auth_ref": [ "r374", "r375", "r390", "r418" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.", "label": "Compensation And Employee Benefit Plans [Text Block]", "terseLabel": "Deferred Compensation Plans" } } }, "localname": "CompensationAndEmployeeBenefitPlansTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlans" ], "xbrltype": "textBlockItemType" }, "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_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest": { "auth_ref": [ "r48", "r50", "r59", "r443", "r453", "r600", "r644" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": { "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. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest", "totalLabel": "Total comprehensive income" } } }, "localname": "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "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]", "terseLabel": "Comprehensive Income" } } }, "localname": "ComprehensiveIncomePolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ConsumerPortfolioSegmentMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Portfolio segment of the company's total financing receivables related to consumer receivables.", "label": "Consumer Portfolio Segment [Member]", "terseLabel": "Consumer Portfolio Segment [Member]" } } }, "localname": "ConsumerPortfolioSegmentMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ContractWithCustomerLiability": { "auth_ref": [ "r356", "r357", "r369" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.", "label": "Contract With Customer Liability", "terseLabel": "Contract with customer, liability, total" } } }, "localname": "ContractWithCustomerLiability", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CoreDepositsMember": { "auth_ref": [ "r629" ], "lang": { "en-us": { "role": { "documentation": "Entity's long-term relationships with depositors, commonly known as core deposit intangibles, which are separate from the financial instruments themselves.", "label": "Core Deposits [Member]", "terseLabel": "Core Deposits [Member]" } } }, "localname": "CoreDepositsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CorporateNoteSecuritiesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "This category includes information about short-term debt securities that are issued by either a domestic or foreign corporate business entity with a date certain promise of repayment and a return to the holder for the time value of money (for example, variable or fixed interest).", "label": "Corporate Note Securities [Member]", "terseLabel": "Corporate Notes [Member]" } } }, "localname": "CorporateNoteSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CostOfGoodsAndServicesSold": { "auth_ref": [ "r62", "r570" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10060.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "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": "Other services" } } }, "localname": "CostOfGoodsAndServicesSold", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CreditLossStatusAxis": { "auth_ref": [ "r202", "r264", "r272" ], "lang": { "en-us": { "role": { "documentation": "Information by credit loss status of financial asset.", "label": "Credit Loss Status [Axis]", "terseLabel": "Credit Loss Status" } } }, "localname": "CreditLossStatusAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CreditLossStatusDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Credit loss status of financial asset.", "label": "Credit Loss Status [Domain]", "terseLabel": "Credit Loss Status" } } }, "localname": "CreditLossStatusDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtDisclosureAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Debt Disclosure [Abstract]", "terseLabel": "Notes to Financial Statements" } } }, "localname": "DebtDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage points added to the reference rate to compute the variable rate on the debt instrument.", "label": "Debt Instrument Basis Spread On Variable Rate1", "terseLabel": "Variable interest rate" } } }, "localname": "DebtInstrumentBasisSpreadOnVariableRate1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentDescriptionOfVariableRateBasis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Description of reference rate used for variable rate of debt instrument.", "label": "Debt Instrument Description Of Variable Rate Basis", "terseLabel": "Variable rate, description" } } }, "localname": "DebtInstrumentDescriptionOfVariableRateBasis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentFaceAmount": { "auth_ref": [ "r339", "r347", "r348", "r511", "r513", "r514" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Face (par) amount of debt instrument at time of issuance.", "label": "Debt Instrument Face Amount", "terseLabel": "Principal amount" } } }, "localname": "DebtInstrumentFaceAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentInterestRateStatedPercentage": { "auth_ref": [ "r23", "r340" ], "lang": { "en-us": { "role": { "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.", "label": "Debt Instrument Interest Rate Stated Percentage", "terseLabel": "Loan, fixed interest rate" } } }, "localname": "DebtInstrumentInterestRateStatedPercentage", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentInterestRateTerms": { "auth_ref": [ "r23" ], "lang": { "en-us": { "role": { "documentation": "Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.", "label": "Debt Instrument Interest Rate Terms", "terseLabel": "Interest rate, description" } } }, "localname": "DebtInstrumentInterestRateTerms", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentMaturityDate": { "auth_ref": [ "r24", "r341", "r490" ], "lang": { "en-us": { "role": { "documentation": "Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.", "label": "Debt Instrument Maturity Date", "terseLabel": "Maturity date" } } }, "localname": "DebtInstrumentMaturityDate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "us-gaap_DebtInstrumentPaymentTerms": { "auth_ref": [ "r25", "r631" ], "lang": { "en-us": { "role": { "documentation": "Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.", "label": "Debt Instrument Payment Terms", "terseLabel": "Loan payment term" } } }, "localname": "DebtInstrumentPaymentTerms", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger": { "auth_ref": [ "r239", "r268", "r271" ], "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), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer", "terseLabel": "Available-for-sale, 12 months or more, fair value" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": { "auth_ref": [ "r239", "r268" ], "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 Position12 Months Or Longer Accumulated Loss", "negatedLabel": "Available-for-sale, 12 months or more, unrealized losses" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions": { "auth_ref": [ "r266" ], "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 continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions", "terseLabel": "Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months": { "auth_ref": [ "r239", "r268", "r271" ], "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), 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 Than12 Months", "terseLabel": "Available-for-sale, less than 12 months, fair value" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": { "auth_ref": [ "r239", "r268" ], "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 Than12 Months Accumulated Loss", "negatedLabel": "Available-for-sale, less than 12 months, unrealized losses" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions": { "auth_ref": [ "r266" ], "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 continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions", "terseLabel": "Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss": { "auth_ref": [ "r240" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10220.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10120.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of realized gain (loss) on 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 Realized Gain Loss", "negatedLabel": "Net gain on sale and prepayment of investment securities", "terseLabel": "Net gain on sales and prepayments of investment securities" } } }, "localname": "DebtSecuritiesAvailableForSaleRealizedGainLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleRestricted": { "auth_ref": [ "r551", "r666", "r667" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of restricted 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 Restricted", "terseLabel": "Debt Securities, Available-for-sale, Restricted" } } }, "localname": "DebtSecuritiesAvailableForSaleRestricted", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable": { "auth_ref": [ "r251" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).", "label": "Debt Securities Held To Maturity Allowance For Credit Loss [Table]", "terseLabel": "Debt Securities Held To Maturity Allowance For Credit Loss [Table]" } } }, "localname": "DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems": { "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 Heldtomaturity Allowance For Credit Loss [Line Items]", "terseLabel": "Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]" } } }, "localname": "DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.", "label": "Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance", "terseLabel": "Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance" } } }, "localname": "DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems": { "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": "Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]", "terseLabel": "Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]" } } }, "localname": "DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.", "label": "Deferred Compensation Liability Current And Noncurrent", "terseLabel": "Deferred Compensation Liability, Current and Noncurrent, Total" } } }, "localname": "DeferredCompensationLiabilityCurrentAndNoncurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredIncomeTaxExpenseBenefit": { "auth_ref": [ "r81", "r94", "r425", "r430", "r431", "r432" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10210.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "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": "Deferred income tax provision" } } }, "localname": "DeferredIncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsLiabilitiesNet": { "auth_ref": [ "r423" ], "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 Liabilities Net", "terseLabel": "Deferred Tax Assets, Net" } } }, "localname": "DeferredTaxAssetsLiabilitiesNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositLiabilitiesAccruedInterest": { "auth_ref": [ "r589" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10090.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of accrued but unpaid interest on deposit liabilities.", "label": "Deposit Liabilities Accrued Interest", "terseLabel": "Accrued interest expense" } } }, "localname": "DepositLiabilitiesAccruedInterest", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_Deposits": { "auth_ref": [ "r585" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10080.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "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", "totalLabel": "Total deposits" } } }, "localname": "Deposits", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositsFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.", "label": "Deposits Fair Value Disclosure", "terseLabel": "Deposits" } } }, "localname": "DepositsFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepreciationAndAmortization": { "auth_ref": [ "r81", "r285" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.", "label": "Depreciation And Amortization", "verboseLabel": "Depreciation and amortization expense" } } }, "localname": "DepreciationAndAmortization", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeAmountOfHedgedItem": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Amount of hedged item in hedging relationship. Excludes hedged asset or liability.", "label": "Derivative Amount Of Hedged Item", "terseLabel": "Designated hedged items" } } }, "localname": "DerivativeAmountOfHedgedItem", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeAssets": { "auth_ref": [ "r32", "r33", "r34", "r496" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.", "label": "Derivative Assets", "terseLabel": "Other assets - derivatives" } } }, "localname": "DerivativeAssets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeContractTypeDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Financial instrument or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.", "label": "Derivative Contract Type [Domain]", "terseLabel": "Derivative Contract" } } }, "localname": "DerivativeContractTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DerivativeGainLossOnDerivativeNet": { "auth_ref": [ "r464" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.", "label": "Derivative Gain Loss On Derivative Net", "terseLabel": "Estimated Fair Value Gain (Loss)" } } }, "localname": "DerivativeGainLossOnDerivativeNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeInstrumentRiskAxis": { "auth_ref": [ "r34", "r463", "r465", "r470", "r472" ], "lang": { "en-us": { "role": { "documentation": "Information by type of derivative contract.", "label": "Derivative Instrument Risk [Axis]", "terseLabel": "Derivative Instrument" } } }, "localname": "DerivativeInstrumentRiskAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Derivative Instruments And Hedging Activities Disclosure [Abstract]" } } }, "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock": { "auth_ref": [ "r480", "r484" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.", "label": "Derivative Instruments And Hedging Activities Disclosure [Text Block]", "terseLabel": "Derivative Financial Instruments" } } }, "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstruments" ], "xbrltype": "textBlockItemType" }, "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis": { "auth_ref": [ "r460", "r463", "r470" ], "lang": { "en-us": { "role": { "documentation": "Information by type of hedging relationship.", "label": "Derivative Instruments Gain Loss By Hedging Relationship [Axis]", "terseLabel": "Hedging Relationship" } } }, "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable": { "auth_ref": [ "r460", "r463", "r470", "r472", "r473", "r478", "r479" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.", "label": "Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table]", "terseLabel": "Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table]" } } }, "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativeInstrumentsGainLossLineItems": { "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": "Derivative Instruments Gain Loss [Line Items]", "terseLabel": "Derivative Instruments Gain Loss [Line Items]" } } }, "localname": "DerivativeInstrumentsGainLossLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet": { "auth_ref": [ "r469", "r471" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.", "label": "Derivative Instruments Gain Loss Reclassified From Accumulated O C I Into Income Effective Portion Net", "terseLabel": "Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net" } } }, "localname": "DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeInstrumentsIncomeStatementLocationOfGainOrLossReclassifiedFromAccumulatedOCI": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The income statement location of the effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.", "label": "Derivative Instruments Income Statement Location Of Gain Or Loss Reclassified From Accumulated O C I", "terseLabel": "Interest income (expense)" } } }, "localname": "DerivativeInstrumentsIncomeStatementLocationOfGainOrLossReclassifiedFromAccumulatedOCI", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativeLiabilities": { "auth_ref": [ "r32", "r33", "r34", "r496" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.", "label": "Derivative Liabilities", "terseLabel": "Other liabilities - derivatives" } } }, "localname": "DerivativeLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeLineItems": { "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": "Derivative [Line Items]", "terseLabel": "Derivative [Line Items]" } } }, "localname": "DerivativeLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativeNotionalAmount": { "auth_ref": [ "r455", "r457" ], "lang": { "en-us": { "role": { "documentation": "Nominal or face amount used to calculate payment on derivative.", "label": "Derivative Notional Amount", "terseLabel": "Notional Amount" } } }, "localname": "DerivativeNotionalAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeTable": { "auth_ref": [ "r454", "r456", "r457", "r460", "r461", "r467", "r470", "r476", "r477", "r479", "r480" ], "lang": { "en-us": { "role": { "documentation": "Schedule that describes and identifies a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.", "label": "Derivative [Table]", "terseLabel": "Derivative [Table]" } } }, "localname": "DerivativeTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DerivativesFairValueLineItems": { "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": "Derivatives Fair Value [Line Items]", "terseLabel": "Derivatives Fair Value [Line Items]" } } }, "localname": "DerivativesFairValueLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DesignatedAsHedgingInstrumentMember": { "auth_ref": [ "r460" ], "lang": { "en-us": { "role": { "documentation": "Derivative instrument designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).", "label": "Designated As Hedging Instrument [Member]", "terseLabel": "Derivatives Designated as Hedging Instruments [Member]" } } }, "localname": "DesignatedAsHedgingInstrumentMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": { "auth_ref": [ "r418" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for share-based payment arrangement.", "label": "Disclosure Of Compensation Related Costs Share Based Payments [Text Block]", "terseLabel": "Stock Awards" } } }, "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwards" ], "xbrltype": "textBlockItemType" }, "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]" } } }, "localname": "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_DividendsCommonStock": { "auth_ref": [ "r353", "r627" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).", "label": "Dividends Common Stock", "negatedLabel": "Dividends declared" } } }, "localname": "DividendsCommonStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_EarningsPerShareBasic": { "auth_ref": [ "r60", "r107", "r108", "r109", "r110", "r111", "r116", "r118", "r120", "r121", "r122", "r125", "r126", "r482", "r483", "r601", "r645" ], "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", "terseLabel": "Basic net income per share" } } }, "localname": "EarningsPerShareBasic", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareBasicAndDilutedAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Earnings Per Share Basic And Diluted [Abstract]" } } }, "localname": "EarningsPerShareBasicAndDilutedAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareDiluted": { "auth_ref": [ "r60", "r107", "r108", "r109", "r110", "r111", "r118", "r120", "r121", "r122", "r125", "r126", "r482", "r483", "r601", "r645" ], "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 net income per share" } } }, "localname": "EarningsPerShareDiluted", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerSharePolicyTextBlock": { "auth_ref": [ "r123", "r124" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.", "label": "Earnings Per Share Policy [Text Block]", "terseLabel": "Net Income Per Share" } } }, "localname": "EarningsPerSharePolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperations": { "auth_ref": [ "r420" ], "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 Continuing Operations", "terseLabel": "Effective Income Tax Rate Reconciliation, Percent" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperations", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EmployeeStockOptionMember": { "auth_ref": [ "r410" ], "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": "Employee Stock Option [Member]", "terseLabel": "Employee Stock Option [Member]" } } }, "localname": "EmployeeStockOptionMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquityComponentDomain": { "auth_ref": [ "r0", "r51", "r52", "r53", "r102", "r103", "r104", "r106", "r112", "r114", "r128", "r247", "r352", "r353", "r413", "r414", "r415", "r426", "r427", "r481", "r501", "r502", "r503", "r504", "r505", "r507", "r653", "r654", "r655", "r701" ], "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]", "terseLabel": "Equity Component" } } }, "localname": "EquityComponentDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_EstimateOfFairValueFairValueDisclosureMember": { "auth_ref": [ "r343", "r347", "r348", "r496" ], "lang": { "en-us": { "role": { "documentation": "Measured as an estimate of fair value.", "label": "Estimate Of Fair Value Fair Value Disclosure [Member]", "terseLabel": "Estimate of Fair Value Measurement" } } }, "localname": "EstimateOfFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "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.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": { "auth_ref": [ "r485", "r486", "r487", "r492" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.", "label": "Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]", "terseLabel": "Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock": { "auth_ref": [ "r485", "r486", "r488" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).", "label": "Fair Value Assets Measured On Nonrecurring Basis [Text Block]", "terseLabel": "Fair Value Assets Measured on Nonrecurring Basis" } } }, "localname": "FairValueAssetsMeasuredOnNonrecurringBasisTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock": { "auth_ref": [ "r488" ], "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 Measured On Nonrecurring Basis Valuation Techniques [Text Block]", "terseLabel": "Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques" } } }, "localname": "FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock": { "auth_ref": [ "r485", "r486" ], "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 [Text Block]", "terseLabel": "Fair Value, Assets Measured on Recurring Basis" } } }, "localname": "FairValueAssetsMeasuredOnRecurringBasisTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTextBlock": { "auth_ref": [ "r485", "r497" ], "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 [Text Block]", "terseLabel": "Fair Value, by Balance Sheet Grouping" } } }, "localname": "FairValueByBalanceSheetGroupingTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueByFairValueHierarchyLevelAxis": { "auth_ref": [ "r343", "r347", "r348", "r377", "r378", "r379", "r380", "r381", "r382", "r383", "r384", "r486", "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 By Fair Value Hierarchy Level [Axis]", "terseLabel": "Fair Value, Inputs, Level 1 [Member]" } } }, "localname": "FairValueByFairValueHierarchyLevelAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementBasisAxis": { "auth_ref": [ "r343", "r347", "r348", "r485", "r493" ], "lang": { "en-us": { "role": { "documentation": "Information by measurement basis.", "label": "Fair Value By Measurement Basis [Axis]", "terseLabel": "Measurement Basis" } } }, "localname": "FairValueByMeasurementBasisAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementFrequencyAxis": { "auth_ref": [ "r485", "r486", "r489", "r490", "r494" ], "lang": { "en-us": { "role": { "documentation": "Information by measurement frequency.", "label": "Fair Value By Measurement Frequency [Axis]", "terseLabel": "Measurement Frequency" } } }, "localname": "FairValueByMeasurementFrequencyAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosureItemAmountsDomain": { "auth_ref": [ "r343", "r347", "r348" ], "lang": { "en-us": { "role": { "documentation": "Measurement basis, for example, but not limited to, reported value, fair value, portion at fair value, portion at other than fair value.", "label": "Fair Value Disclosure Item Amounts [Domain]", "terseLabel": "Fair Value Measurement" } } }, "localname": "FairValueDisclosureItemAmountsDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability": { "auth_ref": [ "r496" ], "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 Offbalance Sheet Risks Amount Liability", "terseLabel": "Commitments and contingent liabilities" } } }, "localname": "FairValueDisclosureOffbalanceSheetRisksAmountLiability", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "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": [ "r491" ], "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 of Financial Instruments" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstruments" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueHedgingMember": { "auth_ref": [ "r458" ], "lang": { "en-us": { "role": { "documentation": "A hedge of the exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, that are attributable to a particular risk.", "label": "Fair Value Hedging [Member]", "terseLabel": "Fair Value Hedging [Member]" } } }, "localname": "FairValueHedgingMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel1Member": { "auth_ref": [ "r343", "r377", "r378", "r383", "r384", "r486", "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 Level1 [Member]", "terseLabel": "Fair Value, Inputs, Level 1 [Member]" } } }, "localname": "FairValueInputsLevel1Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel2Member": { "auth_ref": [ "r343", "r347", "r348", "r377", "r378", "r383", "r384", "r486", "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 Level2 [Member]", "terseLabel": "Fair Value, Inputs, Level 1 [Member]" } } }, "localname": "FairValueInputsLevel2Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel3Member": { "auth_ref": [ "r343", "r347", "r348", "r377", "r378", "r379", "r380", "r381", "r382", "r383", "r384", "r486", "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 Level3 [Member]", "terseLabel": "Fair Value, Inputs, Level 3 [Member]" } } }, "localname": "FairValueInputsLevel3Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementFrequencyDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Measurement frequency.", "label": "Fair Value Measurement Frequency [Domain]", "terseLabel": "Measurement Frequency" } } }, "localname": "FairValueMeasurementFrequencyDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": { "auth_ref": [ "r343", "r347", "r348", "r377", "r378", "r379", "r380", "r381", "r382", "r383", "r384", "r540", "r541", "r542" ], "lang": { "en-us": { "role": { "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.", "label": "Fair Value Measurements Fair Value Hierarchy [Domain]", "terseLabel": "Fair Value Hierarchy and NAV" } } }, "localname": "FairValueMeasurementsFairValueHierarchyDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsRecurringMember": { "auth_ref": [ "r491", "r494" ], "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, Recurring [Member]" } } }, "localname": "FairValueMeasurementsRecurringMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable": { "auth_ref": [ "r462", "r467", "r478" ], "lang": { "en-us": { "role": { "documentation": "Schedule that discloses the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.", "label": "Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table]", "terseLabel": "Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table]" } } }, "localname": "FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FederalDepositInsuranceCorporationPremiumExpense": { "auth_ref": [ "r609" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10080.0, "parentTag": "us-gaap_OperatingExpenses", "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 insurance and state assessments" } } }, "localname": "FederalDepositInsuranceCorporationPremiumExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalFundsPurchased": { "auth_ref": [ "r586" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.", "label": "Federal Funds Purchased", "terseLabel": "Federal Funds Purchased" } } }, "localname": "FederalFundsPurchased", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalFundsSold": { "auth_ref": [ "r593" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10150.0, "parentTag": "us-gaap_Assets", "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": "Federal funds sold" } } }, "localname": "FederalFundsSold", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch": { "auth_ref": [ "r628" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of advances from the Federal Home Loan Bank (FHLB).", "label": "Federal Home Loan Bank Advances Branch Of F H L B Bank Amount Of Advances By Branch", "terseLabel": "Collateral exposure with FHLB in form of advances" } } }, "localname": "FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds": { "auth_ref": [ "r22", "r587", "r628" ], "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 Disclosures Amount Of Available Unused Funds", "terseLabel": "Available lines of credit" } } }, "localname": "FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1": { "auth_ref": [ "r628", "r632" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of the collateral pledged in support of federal home loan bank advances outstanding.", "label": "Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1", "terseLabel": "Federal Home Loan Bank, advances, general debt obligations, disclosures, collateral pledged" } } }, "localname": "FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresDescriptionOfCollateralPledged": { "auth_ref": [ "r628", "r632" ], "lang": { "en-us": { "role": { "documentation": "Describes the collateral pledged in support of Federal Home Loan Bank advances outstanding as of the Balance Sheet date.", "label": "Federal Home Loan Bank Advances General Debt Obligations Disclosures Description Of Collateral Pledged", "terseLabel": "Collateral Requirements" } } }, "localname": "FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresDescriptionOfCollateralPledged", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FederalHomeLoanBankAdvancesLongTerm": { "auth_ref": [ "r591", "r628", "r630" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.", "label": "Federal Home Loan Bank Advances Long Term", "terseLabel": "Long-term Federal Home Loan Bank advances" } } }, "localname": "FederalHomeLoanBankAdvancesLongTerm", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate": { "auth_ref": [ "r322", "r628" ], "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 Advances Maturities Summary Due Within One Year Of Balance Sheet Date", "terseLabel": "Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months, Total" } } }, "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalHomeLoanBankAdvancesMember": { "auth_ref": [ "r587" ], "lang": { "en-us": { "role": { "documentation": "Borrowings from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and also in times of liquidity shortages. The member institution executes a promissory note, which is generally collateralized by government securities to the Federal Reserve or loans.", "label": "Federal Home Loan Bank Advances [Member]", "terseLabel": "FHLB Advances [Member]" } } }, "localname": "FederalHomeLoanBankAdvancesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FederalHomeLoanBankStock": { "auth_ref": [ "r625" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10180.0, "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", "terseLabel": "Federal Home Loan Bank stock, at cost" } } }, "localname": "FederalHomeLoanBankStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_FederalReserveBankAdvancesMember": { "auth_ref": [ "r587" ], "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]", "terseLabel": "Federal Reserve (Discount Window) [Member]" } } }, "localname": "FederalReserveBankAdvancesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember": { "auth_ref": [ "r202" ], "lang": { "en-us": { "role": { "documentation": "Financial asset acquired with deteriorated credit quality.", "label": "Financial Asset Acquired With Credit Deterioration [Member]", "terseLabel": "Financial Asset Acquired With Credit Deterioration [Member]" } } }, "localname": "FinancialAssetAcquiredWithCreditDeteriorationMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancialAssetNotPastDueMember": { "auth_ref": [ "r252", "r263" ], "lang": { "en-us": { "role": { "documentation": "Financial asset not past due.", "label": "Financial Asset Not Past Due [Member]", "terseLabel": "Current" } } }, "localname": "FinancialAssetNotPastDueMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancialAssetPastDueMember": { "auth_ref": [ "r194", "r252", "r263" ], "lang": { "en-us": { "role": { "documentation": "Financial asset past due.", "label": "Financial Asset Past Due [Member]", "terseLabel": "Total Past Due" } } }, "localname": "FinancialAssetPastDueMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancialInstrumentAxis": { "auth_ref": [ "r227", "r231", "r243", "r244", "r245", "r249", "r251", "r252", "r255", "r257", "r267", "r269", "r270", "r271", "r345", "r351", "r480", "r537", "r538", "r539", "r540", "r541", "r542", "r543", "r544", "r545", "r546", "r547", "r548", "r549", "r550", "r552", "r553", "r554", "r555", "r556", "r557", "r558", "r559", "r560", "r561", "r562", "r563", "r564", "r565", "r566", "r567", "r685", "r686", "r687", "r688", "r689", "r690", "r691" ], "lang": { "en-us": { "role": { "documentation": "Information by type of financial instrument.", "label": "Financial Instrument [Axis]", "terseLabel": "Financial Instrument" } } }, "localname": "FinancialInstrumentAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancialInstrumentPerformanceStatusAxis": { "auth_ref": [ "r257" ], "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" } } }, "localname": "FinancialInstrumentPerformanceStatusAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "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" } } }, "localname": "FinancialInstrumentPerformanceStatusDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Financial Instruments Financial Assets Balance Sheet Groupings [Abstract]", "terseLabel": "Assets:" } } }, "localname": "FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]", "terseLabel": "Liabilities:" } } }, "localname": "FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment": { "auth_ref": [ "r173" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1": { "auth_ref": [ "r173" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.", "label": "Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1", "terseLabel": "Individually evaluated for impairment" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment": { "auth_ref": [ "r174" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock": { "auth_ref": [ "r184", "r257" ], "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": "Loans By Credit Quality Indicators" } } }, "localname": "FinancingReceivableCreditQualityIndicatorsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment": { "auth_ref": [ "r174" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsNumberOfContracts2": { "auth_ref": [ "r186" ], "lang": { "en-us": { "role": { "documentation": "Number of financing receivables that have been modified by troubled debt restructurings.", "label": "Financing Receivable Modifications Number Of Contracts2", "terseLabel": "Number of loans" } } }, "localname": "FinancingReceivableModificationsNumberOfContracts2", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails" ], "xbrltype": "integerItemType" }, "us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2": { "auth_ref": [ "r186" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after troubled debt restructuring, of modified financing receivable.", "label": "Financing Receivable Modifications Post Modification Recorded Investment2", "terseLabel": "Post- Modification Principal Balance" } } }, "localname": "FinancingReceivableModificationsPostModificationRecordedInvestment2", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2": { "auth_ref": [ "r186" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, before troubled debt restructuring, of financing receivable to be modified.", "label": "Financing Receivable Modifications Pre Modification Recorded Investment2", "terseLabel": "Pre- Modification Outstanding Principal Balance" } } }, "localname": "FinancingReceivableModificationsPreModificationRecordedInvestment2", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsRecordedInvestment": { "auth_ref": [ "r186", "r204" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of financing receivable modified as troubled debt restructuring.", "label": "Financing Receivable Modifications Recorded Investment", "terseLabel": "Financing Receivable, Troubled Debt Restructuring" } } }, "localname": "FinancingReceivableModificationsRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1": { "auth_ref": [ "r187" ], "lang": { "en-us": { "role": { "documentation": "Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.", "label": "Financing Receivable Modifications Subsequent Default Number Of Contracts1", "terseLabel": "Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts" } } }, "localname": "FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_FinancingReceivablePortfolioSegmentAxis": { "auth_ref": [ "r249", "r251", "r258", "r685", "r686", "r687", "r688", "r689", "r690", "r691", "r693", "r694", "r695", "r696", "r697", "r698", "r699" ], "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" } } }, "localname": "FinancingReceivablePortfolioSegmentAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivablePortfolioSegmentDomain": { "auth_ref": [ "r685", "r686", "r687", "r688", "r689", "r690", "r691", "r693", "r694", "r695", "r696", "r697", "r698", "r699" ], "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" } } }, "localname": "FinancingReceivablePortfolioSegmentDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing": { "auth_ref": [ "r192", "r254", "r263" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of financing receivable 90 days or more past due and still accruing.", "label": "Financing Receivable Recorded Investment90 Days Past Due And Still Accruing", "terseLabel": "Accruing loans past due 90 days or more amounted" } } }, "localname": "FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis": { "auth_ref": [ "r185", "r193", "r194", "r252", "r255", "r257", "r259", "r260", "r262", "r263", "r685", "r686", "r687", "r688", "r689", "r690", "r691", "r693", "r694", "r695", "r696", "r697", "r698", "r699" ], "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": "Financing Receivable Recorded Investment By Class Of Financing Receivable [Axis]", "terseLabel": "Class of Financing Receivable" } } }, "localname": "FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain": { "auth_ref": [ "r685", "r686", "r687", "r688", "r689", "r690", "r691", "r693", "r694", "r695", "r696", "r697", "r698", "r699" ], "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": "Financing Receivable Recorded Investment Class Of Financing Receivable [Domain]", "terseLabel": "Class of Financing Receivable" } } }, "localname": "FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus": { "auth_ref": [ "r191", "r253", "r696", "r697" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of financing receivable on nonaccrual status.", "label": "Financing Receivable Recorded Investment Nonaccrual Status", "terseLabel": "Non-accruing loans" } } }, "localname": "FinancingReceivableRecordedInvestmentNonaccrualStatus", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivables30To59DaysPastDueMember": { "auth_ref": [ "r263" ], "lang": { "en-us": { "role": { "documentation": "Financial asset more than 29 days past due but fewer than 60 days past due.", "label": "Financing Receivables30 To59 Days Past Due [Member]", "terseLabel": "Financial Asset, 30 to 59 Days Past Due" } } }, "localname": "FinancingReceivables30To59DaysPastDueMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivables60To89DaysPastDueMember": { "auth_ref": [ "r263" ], "lang": { "en-us": { "role": { "documentation": "Financial asset more than 59 days past due but fewer than 90 days past due.", "label": "Financing Receivables60 To89 Days Past Due [Member]", "terseLabel": "Financial Asset, 60 to 89 Days Past Due" } } }, "localname": "FinancingReceivables60To89DaysPastDueMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember": { "auth_ref": [ "r263" ], "lang": { "en-us": { "role": { "documentation": "Financial asset equal to or greater than 90 days past due.", "label": "Financing Receivables Equal To Greater Than90 Days Past Due [Member]", "terseLabel": "Financial Asset, Equal to or Greater than 90 Days Past Due" } } }, "localname": "FinancingReceivablesEqualToGreaterThan90DaysPastDueMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivablesPeriodPastDueAxis": { "auth_ref": [ "r194", "r252", "r263" ], "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": "Financial Asset, Aging" } } }, "localname": "FinancingReceivablesPeriodPastDueAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivablesPeriodPastDueDomain": { "auth_ref": [ "r194", "r252", "r263" ], "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": "Financial Asset, Aging" } } }, "localname": "FinancingReceivablesPeriodPastDueDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FiniteLivedIntangibleAssetUsefulLife": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Finite Lived Intangible Asset Useful Life", "terseLabel": "Finite-Lived Intangible Asset, Useful Life" } } }, "localname": "FiniteLivedIntangibleAssetUsefulLife", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization": { "auth_ref": [ "r280" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails": { "order": 10040.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Finite Lived Intangible Assets Accumulated Amortization", "negatedLabel": "Accumulated amortization" } } }, "localname": "FiniteLivedIntangibleAssetsAccumulatedAmortization", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths": { "auth_ref": [ "r282" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails": { "order": 10020.0, "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 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 Assets Amortization Expense Next Twelve Months", "terseLabel": "2022" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails": { "order": 10010.0, "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 remainder of current fiscal year.", "label": "Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year", "terseLabel": "2021" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour": { "auth_ref": [ "r282" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails": { "order": 10050.0, "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.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree": { "auth_ref": [ "r282" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails": { "order": 10040.0, "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.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo": { "auth_ref": [ "r282" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails": { "order": 10030.0, "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.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": { "auth_ref": [ "r277", "r278", "r280", "r283", "r571", "r572" ], "lang": { "en-us": { "role": { "documentation": "Information by major type or class of finite-lived intangible assets.", "label": "Finite Lived Intangible Assets By Major Class [Axis]", "terseLabel": "Finite-Lived Intangible Assets by Major Class" } } }, "localname": "FiniteLivedIntangibleAssetsByMajorClassAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]", "terseLabel": "Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]" } } }, "localname": "FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsGross": { "auth_ref": [ "r280", "r572" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails": { "order": 10030.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Finite Lived Intangible Assets Gross", "terseLabel": "Gross carrying amount" } } }, "localname": "FiniteLivedIntangibleAssetsGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsLineItems": { "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": "Finite Lived Intangible Assets [Line Items]", "terseLabel": "Finite Lived Intangible Assets [Line Items]" } } }, "localname": "FiniteLivedIntangibleAssetsLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": { "auth_ref": [ "r277", "r279" ], "lang": { "en-us": { "role": { "documentation": "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.", "label": "Finite Lived Intangible Assets Major Class Name [Domain]", "terseLabel": "Finite-Lived Intangible Assets, Major Class Name" } } }, "localname": "FiniteLivedIntangibleAssetsMajorClassNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FiniteLivedIntangibleAssetsNet": { "auth_ref": [ "r280", "r571" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails": { "order": 10020.0, "parentTag": "us-gaap_IntangibleAssetsNetIncludingGoodwill", "weight": 1.0 } }, "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", "terseLabel": "Finite-Lived Intangible Assets, Net, Ending Balance", "totalLabel": "Core deposit intangible, net" } } }, "localname": "FiniteLivedIntangibleAssetsNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedRemainingAmortizationExpenseDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GeneralInsuranceExpense": { "auth_ref": [ "r64" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10070.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).", "label": "General Insurance Expense", "terseLabel": "Insurance expense" } } }, "localname": "GeneralInsuranceExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_Goodwill": { "auth_ref": [ "r273", "r274", "r534", "r577" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails": { "order": 10010.0, "parentTag": "us-gaap_IntangibleAssetsNetIncludingGoodwill", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill", "terseLabel": "Goodwill, Ending Balance", "verboseLabel": "Goodwill" } } }, "localname": "Goodwill", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Goodwill And Intangible Assets Disclosure [Abstract]" } } }, "localname": "GoodwillAndIntangibleAssetsDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock": { "auth_ref": [ "r284" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for goodwill and intangible assets.", "label": "Goodwill And Intangible Assets Disclosure [Text Block]", "terseLabel": "Goodwill and Other Intangible Assets" } } }, "localname": "GoodwillAndIntangibleAssetsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets" ], "xbrltype": "textBlockItemType" }, "us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease": { "auth_ref": [ "r474" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.", "label": "Hedged Asset Fair Value Hedge Cumulative Increase Decrease", "terseLabel": "Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets" } } }, "localname": "HedgedAssetFairValueHedgeCumulativeIncreaseDecrease", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfCumulativeBasisAdjustmentsForFairValueHedgesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HedgingDesignationAxis": { "auth_ref": [ "r460", "r473" ], "lang": { "en-us": { "role": { "documentation": "Information by designation of purpose of derivative instrument.", "label": "Hedging Designation [Axis]", "terseLabel": "Hedging Designation" } } }, "localname": "HedgingDesignationAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_HedgingDesignationDomain": { "auth_ref": [ "r460" ], "lang": { "en-us": { "role": { "documentation": "Designation of purpose of derivative instrument.", "label": "Hedging Designation [Domain]", "terseLabel": "Hedging Designation" } } }, "localname": "HedgingDesignationDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_HedgingRelationshipDomain": { "auth_ref": [ "r460" ], "lang": { "en-us": { "role": { "documentation": "Nature or intent of a hedge.", "label": "Hedging Relationship [Domain]", "terseLabel": "Hedging Relationship" } } }, "localname": "HedgingRelationshipDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfNotionalAmountAndFairValueOfDerivativeInstrumentsIncludedOnCompanySConsolidatedBalanceSheetsOnNetBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_HeldToMaturitySecurities": { "auth_ref": [ "r194", "r219", "r248", "r252" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10170.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).", "label": "Held To Maturity Securities", "terseLabel": "Investment securities held-to-maturity, at amortized cost", "totalLabel": "Held-to-maturity, amortized cost" } } }, "localname": "HeldToMaturitySecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain": { "auth_ref": [ "r221", "r229" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10010.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).", "label": "Held To Maturity Securities Accumulated Unrecognized Holding Gain", "terseLabel": "Held-to-maturity, gross unrealized gains" } } }, "localname": "HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss": { "auth_ref": [ "r222", "r230" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10020.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).", "label": "Held To Maturity Securities Accumulated Unrecognized Holding Loss", "negatedLabel": "Held-to-maturity, gross unrealized losses" } } }, "localname": "HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": { "auth_ref": [ "r237", "r239" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.", "label": "Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss", "negatedLabel": "Held-to-maturity, 12 months or more, unrealized losses" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue": { "auth_ref": [ "r236" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.", "label": "Held To Maturity Securities Continuous Unrealized Loss Position Fair Value", "terseLabel": "Investments held-to-maturity in an unrealized loss position" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": { "auth_ref": [ "r237", "r239" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.", "label": "Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss", "negatedLabel": "Held-to-maturity, less than 12 months, unrealized losses" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue": { "auth_ref": [ "r239" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.", "label": "Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value", "terseLabel": "Held-to-maturity, less than 12 months, fair value" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue": { "auth_ref": [ "r239" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.", "label": "Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value", "terseLabel": "Held-to-maturity, 12 months or more, fair value" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": { "auth_ref": [ "r225", "r234", "r618", "r622" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10030.0, "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), 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": "Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value", "terseLabel": "Held-to-maturity, maturity after five to ten years, estimated fair value" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount": { "auth_ref": [ "r225", "r618" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10070.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) 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": "Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount", "terseLabel": "Held-to-maturity, maturing after five to ten years, amortized cost" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": { "auth_ref": [ "r224", "r233", "r617", "r621" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10020.0, "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), 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": "Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value", "terseLabel": "Held-to-maturity, maturing after one to five years, estimated fair value" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount": { "auth_ref": [ "r224", "r617" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10060.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) 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": "Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount", "terseLabel": "Held-to-maturity, maturing after one to five years, amortized cost" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue": { "auth_ref": [ "r226", "r235", "r619", "r623" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10040.0, "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), 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": "Held To Maturity Securities Debt Maturities After Ten Years Fair Value", "terseLabel": "Held-to-maturity, maturing after ten years, estimated fair value" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount": { "auth_ref": [ "r226", "r619" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10080.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) 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": "Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount", "terseLabel": "Held-to-maturity, maturing after ten years, amortized cost" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue": { "auth_ref": [ "r223", "r232", "r616", "r620" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10010.0, "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), 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": "Held To Maturity Securities Debt Maturities Within One Year Fair Value", "terseLabel": "Held-to-maturity, maturing within one year, estimated fair value" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount": { "auth_ref": [ "r223", "r616" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10050.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) 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": "Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount", "terseLabel": "Held-to-maturity, maturing within one year, amortized cost" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesFairValue": { "auth_ref": [ "r220", "r228", "r583" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": 10030.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity).", "label": "Held To Maturity Securities Fair Value", "terseLabel": "Held-to-maturity, estimated fair value", "totalLabel": "Held-to-maturity, amortized cost", "verboseLabel": "Investment securities held-to-maturity" } } }, "localname": "HeldToMaturitySecuritiesFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment": { "auth_ref": [ "r179", "r183" ], "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": "Impaired loans, average recorded investment" } } }, "localname": "ImpairedFinancingReceivableAverageRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod": { "auth_ref": [ "r180" ], "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": "Impaired loans, interest income recognized" } } }, "localname": "ImpairedFinancingReceivableInterestIncomeAccrualMethod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod": { "auth_ref": [ "r181" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of interest income recognized on a cash-basis method of accounting 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 Cash Basis Method", "terseLabel": "Impaired loans, interest income received" } } }, "localname": "ImpairedFinancingReceivableInterestIncomeCashBasisMethod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableRecordedInvestment": { "auth_ref": [ "r176" ], "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": "Impaired loans, carrying amount" } } }, "localname": "ImpairedFinancingReceivableRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableRelatedAllowance": { "auth_ref": [ "r177" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of allowance for credit losses related to recorded investment.", "label": "Impaired Financing Receivable Related Allowance", "terseLabel": "Impaired loans, related allowances" } } }, "localname": "ImpairedFinancingReceivableRelatedAllowance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance": { "auth_ref": [ "r178" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.", "label": "Impaired Financing Receivable Unpaid Principal Balance", "terseLabel": "Impaired loans, unpaid principal balance" } } }, "localname": "ImpairedFinancingReceivableUnpaidPrincipalBalance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment": { "auth_ref": [ "r176" ], "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": "Impaired loans with no related allowance recorded, carrying amount" } } }, "localname": "ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance": { "auth_ref": [ "r178" ], "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": "Impaired loans with no related allowance recorded, unpaid principal balance" } } }, "localname": "ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment": { "auth_ref": [ "r176" ], "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": "Impaired loans with no related allowance recorded, carrying amount" } } }, "localname": "ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance": { "auth_ref": [ "r178" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.", "label": "Impaired Financing Receivable With Related Allowance Unpaid Principal Balance", "terseLabel": "Impaired loans with no related allowance recorded, unpaid principal balance" } } }, "localname": "ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivablesTableTextBlock": { "auth_ref": [ "r182" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of impaired financing receivables.", "label": "Impaired Financing Receivables Table [Text Block]", "terseLabel": "Impaired Loans" } } }, "localname": "ImpairedFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ImpairmentOfRealEstate": { "auth_ref": [ "r81", "r287" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The charge against earnings in the period to reduce the carrying amount of real property to fair value.", "label": "Impairment Of Real Estate", "negatedLabel": "Impairment" } } }, "localname": "ImpairmentOfRealEstate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": { "auth_ref": [ "r56", "r144", "r150", "r154", "r157", "r160", "r573", "r597", "r614", "r646" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": 10010.0, "parentTag": "us-gaap_ProfitLoss", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10010.0, "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 Extraordinary Items Noncontrolling Interest", "totalLabel": "Income before income taxes" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "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_IncomeStatementLocationAxis": { "auth_ref": [ "r288", "r294" ], "lang": { "en-us": { "role": { "documentation": "Information by location in the income statement.", "label": "Income Statement Location [Axis]", "terseLabel": "Income Statement Location" } } }, "localname": "IncomeStatementLocationAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementLocationDomain": { "auth_ref": [ "r294" ], "lang": { "en-us": { "role": { "documentation": "Location in the income statement.", "label": "Income Statement Location [Domain]", "terseLabel": "Income Statement Location" } } }, "localname": "IncomeStatementLocationDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsScheduleOfHedgingDerivativeInstrumentsEffectOnCompanySConsolidatedStatementOfOperationsDetails" ], "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": [ "r95", "r421", "r422", "r424", "r428", "r433", "r435", "r436", "r437" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureIncomeTaxes" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncomeTaxExpenseBenefit": { "auth_ref": [ "r96", "r113", "r114", "r142", "r419", "r429", "r434", "r647" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": 10020.0, "parentTag": "us-gaap_ProfitLoss", "weight": -1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10020.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": -1.0 } }, "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": "Provision for income taxes" } } }, "localname": "IncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxesPaidNet": { "auth_ref": [ "r86" ], "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": "Income taxes" } } }, "localname": "IncomeTaxesPaidNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet": { "auth_ref": [ "r80" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10270.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.", "label": "Increase Decrease In Accrued Interest Receivable Net", "negatedLabel": "Decrease (increase) in accrued interest receivable" } } }, "localname": "IncreaseDecreaseInAccruedInterestReceivableNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInContractWithCustomerLiability": { "auth_ref": [ "r80", "r569" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10040.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.", "label": "Increase Decrease In Contract With Customer Liability", "terseLabel": "Net increase in deposits" } } }, "localname": "IncreaseDecreaseInContractWithCustomerLiability", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInFederalFundsSold": { "auth_ref": [ "r76", "r79", "r613" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10090.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The net cash inflow or outflow from the fund lent to other financial institution arising from the excess in reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest.", "label": "Increase Decrease In Federal Funds Sold", "terseLabel": "Net decrease in federal funds sold" } } }, "localname": "IncreaseDecreaseInFederalFundsSold", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInInterestPayableNet": { "auth_ref": [ "r80" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10290.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.", "label": "Increase Decrease In Interest Payable Net", "terseLabel": "Decrease in accrued interest expense" } } }, "localname": "IncreaseDecreaseInInterestPayableNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInLoansDeferredIncome": { "auth_ref": [ "r80" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The increase (decrease) during the reporting period in net unamortized loan origination fees and other fees that are collected at origination but recorded as income over the life of the loan.", "label": "Increase Decrease In Loans Deferred Income", "terseLabel": "Net deferred loan fee" } } }, "localname": "IncreaseDecreaseInLoansDeferredIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Increase Decrease In Operating Capital [Abstract]", "terseLabel": "Changes in assets and liabilities:" } } }, "localname": "IncreaseDecreaseInOperatingCapitalAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_IncreaseDecreaseInOtherOperatingAssets": { "auth_ref": [ "r80" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10280.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in operating assets classified as other.", "label": "Increase Decrease In Other Operating Assets", "negatedLabel": "Decrease (increase) in other assets" } } }, "localname": "IncreaseDecreaseInOtherOperatingAssets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOtherOperatingLiabilities": { "auth_ref": [ "r80" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10300.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in operating liabilities classified as other.", "label": "Increase Decrease In Other Operating Liabilities", "terseLabel": "Decrease in other liabilities" } } }, "localname": "IncreaseDecreaseInOtherOperatingLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_IntangibleAssetsNetIncludingGoodwill": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10230.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.", "label": "Intangible Assets Net Including Goodwill", "terseLabel": "Goodwill and core deposit intangible, net", "totalLabel": "Total" } } }, "localname": "IntangibleAssetsNetIncludingGoodwill", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfGoodwillAndOtherIntangibleAssetsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestAndDividendIncomeOperating": { "auth_ref": [ "r603" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10180.0, "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 income" } } }, "localname": "InterestAndDividendIncomeOperating", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestAndDividendIncomeOperatingAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Interest And Dividend Income Operating [Abstract]", "terseLabel": "Interest income:" } } }, "localname": "InterestAndDividendIncomeOperatingAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_InterestAndDividendIncomeSecurities": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10230.0, "parentTag": "us-gaap_InterestAndDividendIncomeOperating", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.", "label": "Interest And Dividend Income Securities", "terseLabel": "Interest on investment securities" } } }, "localname": "InterestAndDividendIncomeSecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestAndFeeIncomeLoansAndLeases": { "auth_ref": [ "r602" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10220.0, "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": "Interest and fees on loans" } } }, "localname": "InterestAndFeeIncomeLoansAndLeases", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestBearingDepositLiabilities": { "auth_ref": [ "r585" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10130.0, "parentTag": "us-gaap_Deposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The aggregate of all domestic and foreign interest-bearing deposit liabilities.", "label": "Interest Bearing Deposit Liabilities", "terseLabel": "Interest-bearing" } } }, "localname": "InterestBearingDepositLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestBearingDepositsInBanks": { "auth_ref": [ "r575", "r592" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10270.0, "parentTag": "us-gaap_CashAndCashEquivalentsAtCarryingValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.", "label": "Interest Bearing Deposits In Banks", "terseLabel": "Interest-bearing deposits in banks" } } }, "localname": "InterestBearingDepositsInBanks", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpense": { "auth_ref": [ "r55", "r138", "r509", "r512", "r612" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10190.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Interest Expense [Abstract]", "terseLabel": "Interest expense:" } } }, "localname": "InterestExpenseAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_InterestExpenseBorrowings": { "auth_ref": [ "r611" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10210.0, "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": "Interest on borrowings" } } }, "localname": "InterestExpenseBorrowings", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseDeposits": { "auth_ref": [ "r610" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10200.0, "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 on deposits" } } }, "localname": "InterestExpenseDeposits", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss": { "auth_ref": [ "r606" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10030.0, "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 and lease losses" } } }, "localname": "InterestIncomeExpenseAfterProvisionForLoanLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestIncomeExpenseNet": { "auth_ref": [ "r604" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": 10030.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10160.0, "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", "terseLabel": "Net interest income", "totalLabel": "Net interest income" } } }, "localname": "InterestIncomeExpenseNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestPaidNet": { "auth_ref": [ "r74", "r77", "r86" ], "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 Net", "terseLabel": "Interest" } } }, "localname": "InterestPaidNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestReceivable": { "auth_ref": [ "r31" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10220.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InternalCreditAssessmentAxis": { "auth_ref": [ "r184", "r257", "r261", "r262", "r320", "r475" ], "lang": { "en-us": { "role": { "documentation": "Information by entity-defined rating.", "label": "Internal Credit Assessment [Axis]", "terseLabel": "Internal Credit Assessment" } } }, "localname": "InternalCreditAssessmentAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "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" } } }, "localname": "InternalCreditAssessmentDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IntersegmentEliminationMember": { "auth_ref": [ "r136", "r149", "r150", "r151", "r152", "r154", "r156", "r160" ], "lang": { "en-us": { "role": { "documentation": "Eliminating entries used in operating segment consolidation.", "label": "Intersegment Elimination [Member]", "terseLabel": "Intersegment Eliminations [Member]" } } }, "localname": "IntersegmentEliminationMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.", "label": "Investment In Federal Home Loan Bank Stock Fair Value Disclosure", "terseLabel": "Federal Home Loan Bank stock" } } }, "localname": "InvestmentInFederalHomeLoanBankStockFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "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": "Maturities of Investment Securities Available-for-Sale and Held-to-Maturity" } } }, "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Investments Debt And Equity Securities [Abstract]" } } }, "localname": "InvestmentsDebtAndEquitySecuritiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures": { "auth_ref": [ "r18" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of investment in equity method investee and investment in and advance to affiliate.", "label": "Investments In Affiliates Subsidiaries Associates And Joint Ventures", "terseLabel": "Investment in subsidiaries" } } }, "localname": "InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock": { "auth_ref": [ "r242", "r574", "r624", "r664", "r692" ], "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]", "terseLabel": "Investment Securities" } } }, "localname": "InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecurities" ], "xbrltype": "textBlockItemType" }, "us-gaap_LaborAndRelatedExpense": { "auth_ref": [ "r61" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10060.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseCost": { "auth_ref": [ "r525", "r527" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of lease cost recognized by lessee for lease contract.", "label": "Lease Cost", "terseLabel": "Operating lease expense" } } }, "localname": "LeaseCost", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseCostTableTextBlock": { "auth_ref": [ "r525" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.", "label": "Lease Cost Table [Text Block]", "terseLabel": "Components of Lease Expense" } } }, "localname": "LeaseCostTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LeaseIncome": { "auth_ref": [ "r530" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10140.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.", "label": "Lease Income", "terseLabel": "Lease income" } } }, "localname": "LeaseIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeasesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Leases [Abstract]" } } }, "localname": "LeasesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionLineItems": { "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": "Lessee Lease Description [Line Items]", "terseLabel": "Lessee Lease Description [Line Items]" } } }, "localname": "LesseeLeaseDescriptionLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionTable": { "auth_ref": [ "r521" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about lessee's leases.", "label": "Lessee Lease Description [Table]", "terseLabel": "Lessee Lease Description [Table]" } } }, "localname": "LesseeLeaseDescriptionTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock": { "auth_ref": [ "r526" ], "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": "Future Minimum Operating Lease Payments" } } }, "localname": "LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails2": { "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 Payments Due", "totalLabel": "Total future minimum lease payments" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": 10060.0, "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 due 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": "Lessee Operating Lease Liability Payments Due After Year Five", "terseLabel": "2026 and thereafter" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": 10020.0, "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 Payments Due Next Twelve Months", "terseLabel": "2022" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": 10050.0, "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 Payments Due Year Four", "terseLabel": "2025" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": 10040.0, "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 Payments Due Year Three", "terseLabel": "2024" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": 10030.0, "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 Payments Due Year Two", "terseLabel": "2023" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails": { "order": 10010.0, "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 having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.", "label": "Lessee Operating Lease Liability Payments Remainder Of Fiscal Year", "terseLabel": "2021" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": { "auth_ref": [ "r526" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails2": { "order": 10010.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.", "label": "Lessee Operating Lease Liability Undiscounted Excess Amount", "terseLabel": "Less: Imputed interest" } } }, "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseRenewalTerm": { "auth_ref": [ "r520" ], "lang": { "en-us": { "role": { "documentation": "Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Lessee Operating Lease Renewal Term", "terseLabel": "Lessee, Operating Lease, Renewal Term" } } }, "localname": "LesseeOperatingLeaseRenewalTerm", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_LesseeOperatingLeasesTextBlock": { "auth_ref": [ "r528" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.", "label": "Lessee Operating Leases [Text Block]", "terseLabel": "Leases" } } }, "localname": "LesseeOperatingLeasesTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeases" ], "xbrltype": "textBlockItemType" }, "us-gaap_Liabilities": { "auth_ref": [ "r21", "r93", "r152", "r246", "r324", "r325", "r326", "r329", "r330", "r331", "r333", "r335", "r337", "r338", "r445", "r449", "r450", "r499", "r532", "r533" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10010.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r16", "r93", "r246", "r499", "r534", "r582", "r640" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "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 Stockholders Equity", "totalLabel": "Total liabilities and shareholders\u2019 equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Liabilities And Stockholders Equity [Abstract]", "terseLabel": "LIABILITIES AND SHAREHOLDERS\u2019 EQUITY" } } }, "localname": "LiabilitiesAndStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesFairValueDisclosure": { "auth_ref": [ "r485" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Fair value of financial and nonfinancial obligations.", "label": "Liabilities Fair Value Disclosure", "terseLabel": "Financial and Nonfinancial Liabilities, Fair Value Disclosure" } } }, "localname": "LiabilitiesFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails" ], "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]", "terseLabel": "Loan Restructuring Modification" } } }, "localname": "LoanRestructuringModificationAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "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]", "terseLabel": "Loan Restructuring Modification" } } }, "localname": "LoanRestructuringModificationDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LoansAndLeasesReceivableAllowance": { "auth_ref": [ "r170", "r173", "r195", "r201" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails": { "order": 10030.0, "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", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance", "terseLabel": "Loans, allowance for loan losses" } } }, "localname": "LoansAndLeasesReceivableAllowance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableDeferredIncome": { "auth_ref": [ "r189", "r198", "r516", "r596" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails": { "order": 10020.0, "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.", "label": "Loans And Leases Receivable Deferred Income", "terseLabel": "Less: Unearned interest, fees and deferred cost" } } }, "localname": "LoansAndLeasesReceivableDeferredIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableGrossCarryingAmount": { "auth_ref": [ "r167" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails": { "order": 10010.0, "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "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 Carrying Amount", "terseLabel": "Loans" } } }, "localname": "LoansAndLeasesReceivableGrossCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans": { "auth_ref": [ "r203" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).", "label": "Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans", "terseLabel": "Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans" } } }, "localname": "LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest": { "auth_ref": [ "r191" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.", "label": "Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest", "terseLabel": "Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest" } } }, "localname": "LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableNetReportedAmount": { "auth_ref": [ "r167", "r596" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10190.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "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 Reported Amount", "terseLabel": "Loans, net of allowance for loan and lease losses of $8,193 and $7,470, respectively", "totalLabel": "Net loans", "verboseLabel": "Total loans, net" } } }, "localname": "LoansAndLeasesReceivableNetReportedAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableRelatedParties": { "auth_ref": [ "r531", "r595" ], "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": "Loans and Leases Receivable, Related Parties, Ending Balance" } } }, "localname": "LoansAndLeasesReceivableRelatedParties", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions": { "auth_ref": [ "r531", "r595" ], "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": "Loans and Leases Receivable, Related Parties, Additions" } } }, "localname": "LoansAndLeasesReceivableRelatedPartiesAdditions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds": { "auth_ref": [ "r68", "r584" ], "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", "terseLabel": "Loans and Leases Receivable, Related Parties, Proceeds" } } }, "localname": "LoansAndLeasesReceivableRelatedPartiesProceeds", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Information by US and non-US government sponsored enterprise, authority, agency and program guarantees for government insured loans.", "label": "Loans Insured Or Guaranteed By Government Authorities [Axis]", "terseLabel": "Loans Insured or Guaranteed by Government Authorities" } } }, "localname": "LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Guarantee by US and non-US government sponsored enterprises, authorities, agencies and programs for government insured loans.", "label": "Loans Insured Or Guaranteed By Government Authorities [Domain]", "terseLabel": "Loans Insured or Guaranteed by Government Authorities" } } }, "localname": "LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock": { "auth_ref": [ "r196" ], "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 and Allowance for Loan and Lease Losses" } } }, "localname": "LoansNotesTradeAndOtherReceivablesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLosses" ], "xbrltype": "textBlockItemType" }, "us-gaap_LoansPledgedAsCollateral": { "auth_ref": [ "r190", "r550" ], "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": "Loans Pledged as Collateral" } } }, "localname": "LoansPledgedAsCollateral", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansReceivableFairValueDisclosure": { "auth_ref": [ "r196" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.", "label": "Loans Receivable Fair Value Disclosure", "terseLabel": "Loans, net of allowance for loan and lease losses" } } }, "localname": "LoansReceivableFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebt": { "auth_ref": [ "r10", "r342", "r346", "r347", "r348", "r581", "r637" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.", "label": "Long Term Debt", "terseLabel": "Loan, aggregate principal balance" } } }, "localname": "LongTermDebt", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongtermDebtTypeAxis": { "auth_ref": [ "r26" ], "lang": { "en-us": { "role": { "documentation": "Information by type of long-term debt.", "label": "Longterm Debt Type [Axis]", "terseLabel": "Long-term Debt, Type" } } }, "localname": "LongtermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongtermDebtTypeDomain": { "auth_ref": [ "r26", "r323" ], "lang": { "en-us": { "role": { "documentation": "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.", "label": "Longterm Debt Type [Domain]", "terseLabel": "Long-term Debt, Type" } } }, "localname": "LongtermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LossContingenciesByNatureOfContingencyAxis": { "auth_ref": [ "r309", "r310", "r311", "r312", "r313", "r314", "r315", "r318", "r319" ], "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 Contingencies By Nature Of Contingency [Axis]", "terseLabel": "Loss Contingency Nature" } } }, "localname": "LossContingenciesByNatureOfContingencyAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LossContingencyNatureDomain": { "auth_ref": [ "r309", "r310", "r311", "r312", "r313", "r314", "r315", "r318", "r319" ], "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" } } }, "localname": "LossContingencyNatureDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MarketableSecurities": { "auth_ref": [ "r594" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of investment in marketable security.", "label": "Marketable Securities", "terseLabel": "Total investment securities" } } }, "localname": "MarketableSecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_MarketingAndAdvertisingExpense": { "auth_ref": [ "r64" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10030.0, "parentTag": "us-gaap_OperatingExpenses", "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 marketing" } } }, "localname": "MarketingAndAdvertisingExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_MeasurementInputComparabilityAdjustmentMember": { "auth_ref": [ "r488" ], "lang": { "en-us": { "role": { "documentation": "Measurement input using adjustment to observed price for similar asset or liability when identical transaction does not exist.", "label": "Measurement Input Comparability Adjustment [Member]", "terseLabel": "Measurement Input, Comparability Adjustment [Member]" } } }, "localname": "MeasurementInputComparabilityAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" ], "xbrltype": "domainItemType" }, "us-gaap_MeasurementInputTypeAxis": { "auth_ref": [ "r488" ], "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" } } }, "localname": "MeasurementInputTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" ], "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" } } }, "localname": "MeasurementInputTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" ], "xbrltype": "domainItemType" }, "us-gaap_MortgageBankingMember": { "auth_ref": [ "r370" ], "lang": { "en-us": { "role": { "documentation": "Origination or servicing of loan secured by real property.", "label": "Mortgage Banking [Member]", "terseLabel": "Mortgage Banking [Member]" } } }, "localname": "MortgageBankingMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_MortgageLoansInProcessOfForeclosureAmount": { "auth_ref": [ "r188" ], "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": "Mortgage loans in process of foreclosure, amount" } } }, "localname": "MortgageLoansInProcessOfForeclosureAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NatureOfOperations": { "auth_ref": [ "r129", "r130" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.", "label": "Nature Of Operations", "terseLabel": "General" } } }, "localname": "NatureOfOperations", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGeneral" ], "xbrltype": "textBlockItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r76" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10030.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r76" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10020.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r76", "r78", "r82" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10010.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLoss": { "auth_ref": [ "r4", "r46", "r49", "r53", "r57", "r82", "r93", "r105", "r107", "r108", "r109", "r110", "r113", "r114", "r119", "r144", "r150", "r154", "r157", "r160", "r246", "r324", "r325", "r326", "r329", "r330", "r331", "r333", "r335", "r337", "r338", "r483", "r499", "r598", "r642" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "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", "terseLabel": "Net income", "totalLabel": "Net income" } } }, "localname": "NetIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "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]", "terseLabel": "Accounting Policies Recently Adopted" } } }, "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_NoninterestBearingDepositLiabilities": { "auth_ref": [ "r585" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10120.0, "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" } } }, "localname": "NoninterestBearingDepositLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NoninterestExpense": { "auth_ref": [ "r609" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": 10060.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Total aggregate amount of all noninterest expense.", "label": "Noninterest Expense", "terseLabel": "Total non-interest expense", "totalLabel": "Total non-interest expense" } } }, "localname": "NoninterestExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NoninterestExpenseAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Noninterest Expense [Abstract]", "terseLabel": "Non-interest expense:" } } }, "localname": "NoninterestExpenseAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_NoninterestIncome": { "auth_ref": [ "r607" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10040.0, "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", "terseLabel": "Total non-interest income", "totalLabel": "Total non-interest income" } } }, "localname": "NoninterestIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NoninterestIncomeAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Noninterest Income [Abstract]", "terseLabel": "Non-interest income:" } } }, "localname": "NoninterestIncomeAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_NoninterestIncomeOther": { "auth_ref": [ "r607" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10150.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.", "label": "Noninterest Income Other", "terseLabel": "Other income, net", "totalLabel": "Total" } } }, "localname": "NoninterestIncomeOther", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NonperformingFinancingReceivableMember": { "auth_ref": [ "r184", "r257" ], "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 Financing Receivable [Member]", "terseLabel": "Nonperforming Financial Instruments" } } }, "localname": "NonperformingFinancingReceivableMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_NotesReceivableGross": { "auth_ref": [ "r194", "r248", "r252", "r256", "r262", "r263", "r693", "r695", "r696" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, before allowance for credit loss, of financing receivable.", "label": "Notes Receivable Gross", "terseLabel": "Loans" } } }, "localname": "NotesReceivableGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NumberOfReportableSegments": { "auth_ref": [ "r132" ], "lang": { "en-us": { "role": { "documentation": "Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.", "label": "Number Of Reportable Segments", "terseLabel": "Number of Reportable Segments" } } }, "localname": "NumberOfReportableSegments", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGeneralAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_OccupancyNet": { "auth_ref": [ "r65", "r515", "r608" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10070.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.", "label": "Occupancy Net", "terseLabel": "Net occupancy and equipment" } } }, "localname": "OccupancyNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingExpenses": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.", "label": "Operating Expenses", "totalLabel": "Total" } } }, "localname": "OperatingExpenses", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLeaseIncome": { "auth_ref": [ "r127", "r529", "r530" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.", "label": "Operating Lease Lease Income", "terseLabel": "Operating lease income" } } }, "localname": "OperatingLeaseLeaseIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiability": { "auth_ref": [ "r518" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails2": { "order": 10020.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.", "label": "Operating Lease Liability", "terseLabel": "Operating lease, liability", "verboseLabel": "Total operating lease liabilities" } } }, "localname": "OperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesFutureMinimumOperatingLeasePaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasePayments": { "auth_ref": [ "r519", "r522" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.", "label": "Operating Lease Payments", "terseLabel": "Operating cash flows from operating leases" } } }, "localname": "OperatingLeasePayments", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseRightOfUseAsset": { "auth_ref": [ "r517" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's right to use underlying asset under operating lease.", "label": "Operating Lease Right Of Use Asset", "terseLabel": "Operating lease, right-of-use asset" } } }, "localname": "OperatingLeaseRightOfUseAsset", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": { "auth_ref": [ "r524", "r527" ], "lang": { "en-us": { "role": { "documentation": "Weighted average discount rate for operating lease calculated at point in time.", "label": "Operating Lease Weighted Average Discount Rate Percent", "terseLabel": "Weighted-average discount rate" } } }, "localname": "OperatingLeaseWeightedAverageDiscountRatePercent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails" ], "xbrltype": "percentItemType" }, "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": { "auth_ref": [ "r523", "r527" ], "lang": { "en-us": { "role": { "documentation": "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Operating Lease Weighted Average Remaining Lease Term1", "terseLabel": "Weighted-average remaining lease term (in years)" } } }, "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseDetails" ], "xbrltype": "durationItemType" }, "us-gaap_OperatingSegmentsMember": { "auth_ref": [ "r149", "r150", "r151", "r152", "r154", "r160" ], "lang": { "en-us": { "role": { "documentation": "Identifies components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.", "label": "Operating Segments [Member]", "terseLabel": "Operating Segments [Member]" } } }, "localname": "OperatingSegmentsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Organization Consolidation And Presentation Of Financial Statements [Abstract]", "terseLabel": "Notes to Financial Statements" } } }, "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_OtherAssets": { "auth_ref": [ "r8", "r578", "r634" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10250.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax": { "auth_ref": [ "r37", "r38", "r40" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and 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 Available For Sale Securities Adjustment Net Of Tax", "terseLabel": "Net change in fair value of securities available-for-sale, net of tax" } } }, "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax": { "auth_ref": [ "r35", "r40" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": { "order": 10050.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.", "label": "Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax", "terseLabel": "Unrealized holding gains (losses) arising during the period on effective cash flow hedge derivatives, net of tax expense (benefit) of $25, $15, $186 and ($488), respectively" } } }, "localname": "OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax": { "auth_ref": [ "r41" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.", "label": "Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax", "terseLabel": "Unrealized holding gains (losses) arising during the period on effective cash flow hedge derivatives, tax expense (benefit)" } } }, "localname": "OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsTaxNoncontrollingInterest1": { "auth_ref": [ "r36", "r468" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, after adjustments, of tax expense (benefit) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge, attributable to noncontrolling interest. Adjustments include, but are not limited to, reclassification for sale and settlement, and amount recognized under systematic and rational method.", "label": "Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease After Adjustments Tax Noncontrolling Interest1", "terseLabel": "Net change in fair value of derivative instruments, net of tax" } } }, "localname": "OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsTaxNoncontrollingInterest1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r47", "r50", "r51", "r52", "r54", "r58", "r352", "r501", "r506", "r507", "r599", "r643" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": { "order": 10020.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest", "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 income (loss)" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]", "terseLabel": "Other comprehensive income (loss):" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax": { "auth_ref": [ "r40", "r44", "r45", "r241" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": { "order": 10040.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount after 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 A O C I For Sale Of Securities Net Of Tax", "negatedLabel": "Reclassification adjustment for net gains on securities available-for -sale realized in net income, net of tax of $0, $0, $6 and $81, respectively" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax": { "auth_ref": [ "r41", "r241" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of tax expense (benefit) 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 A O C I For Sale Of Securities Tax", "terseLabel": "Reclassification adjustment for net gains on securities available-for-sale realized in net income, tax expense (benefit)" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax": { "auth_ref": [ "r37", "r40" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": { "order": 10030.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, after tax and before 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 Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax", "terseLabel": "Unrealized holding (losses) gains on securities available-for-sale arising during period, net of tax (benefit) expense of ($7), ($2), ($41) and $548, respectively" } } }, "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax": { "auth_ref": [ "r38", "r41" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, before adjustment, of tax expense (benefit) for 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 tax expense (benefit) for 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 Unrealized Holding Gain Loss On Securities Arising During Period Tax", "terseLabel": "Unrealized holding gains (losses) on securities available-for-sale arising during period, tax expense (benefit)" } } }, "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherCostAndExpenseOperating": { "auth_ref": [ "r63" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10120.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.", "label": "Other Cost And Expense Operating", "terseLabel": "Other expense" } } }, "localname": "OtherCostAndExpenseOperating", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherForeclosedAssets": { "auth_ref": [ "r168", "r169" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Carrying amount as of the balance sheet date of assets other than real property that were received in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance.", "label": "Other Foreclosed Assets", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance" } } }, "localname": "OtherForeclosedAssets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherIncome": { "auth_ref": [ "r648" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails": { "order": 10070.0, "parentTag": "us-gaap_NoninterestIncomeOther", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of revenue and income classified as other.", "label": "Other Income", "terseLabel": "Other income" } } }, "localname": "OtherIncome", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherIncomeAndExpensesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Other Income And Expenses [Abstract]" } } }, "localname": "OtherIncomeAndExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_OtherLiabilities": { "auth_ref": [ "r590" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10100.0, "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherLiabilitiesMember": { "auth_ref": [ "r462", "r478" ], "lang": { "en-us": { "role": { "documentation": "Primary financial statement caption encompassing other liabilities.", "label": "Other Liabilities [Member]", "terseLabel": "Other Liabilities [Member]" } } }, "localname": "OtherLiabilitiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OtherNoninterestExpense": { "auth_ref": [ "r609" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10100.0, "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 expense" } } }, "localname": "OtherNoninterestExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherOperatingIncomeAndExpenseTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for other operating income and other operating expense items.", "label": "Other Operating Income And Expense [Text Block]", "terseLabel": "Other Operating Income and Expense" } } }, "localname": "OtherOperatingIncomeAndExpenseTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpense" ], "xbrltype": "textBlockItemType" }, "us-gaap_OtherRealEstateAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Other Real Estate [Abstract]" } } }, "localname": "OtherRealEstateAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_OtherRestructuringCosts": { "auth_ref": [ "r81" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails": { "order": 10050.0, "parentTag": "us-gaap_RestructuringCharges", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.", "label": "Other Restructuring Costs", "terseLabel": "Other expenses" } } }, "localname": "OtherRestructuringCosts", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings": { "auth_ref": [ "r207" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings.", "label": "Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings", "terseLabel": "Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Total" } } }, "localname": "OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PassMember": { "auth_ref": [ "r184", "r257" ], "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" } } }, "localname": "PassMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PastDueFinancingReceivablesTableTextBlock": { "auth_ref": [ "r193", "r194", "r252", "r263" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of aging analysis for financing receivable.", "label": "Past Due Financing Receivables Table [Text Block]", "terseLabel": "Aging Analysis of Past Due Loans" } } }, "localname": "PastDueFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10140.0, "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 decrease in Federal Home Loan Bank stock" } } }, "localname": "PaymentsForProceedsFromFederalHomeLoanBankStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForProceedsFromLoansReceivable": { "auth_ref": [ "r84", "r85" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10160.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The net amount paid or received by the reporting entity associated with purchase (sale or collection) of loans receivable arising from the financing of goods and services.", "label": "Payments For Proceeds From Loans Receivable", "negatedLabel": "Net increase in loans" } } }, "localname": "PaymentsForProceedsFromLoansReceivable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForRepurchaseOfCommonStock": { "auth_ref": [ "r73" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10070.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The cash outflow to reacquire common stock during the period.", "label": "Payments For Repurchase Of Common Stock", "negatedLabel": "Treasury stock repurchases" } } }, "localname": "PaymentsForRepurchaseOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDividends": { "auth_ref": [ "r73" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10080.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.", "label": "Payments Of Dividends", "negatedLabel": "Dividends paid" } } }, "localname": "PaymentsOfDividends", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation": { "auth_ref": [ "r73" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10060.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.", "label": "Payments Related To Tax Withholding For Share Based Compensation", "negatedLabel": "Net share-based compensation transactions" } } }, "localname": "PaymentsRelatedToTaxWithholdingForShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt": { "auth_ref": [ "r67", "r70", "r206" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10100.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Payments To Acquire Available For Sale Securities Debt", "negatedLabel": "Purchases of investment securities, available-for-sale" } } }, "localname": "PaymentsToAcquireAvailableForSaleSecuritiesDebt", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": { "auth_ref": [ "r71" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10170.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.", "label": "Payments To Acquire Property Plant And Equipment", "negatedLabel": "Purchases of premises and equipment", "terseLabel": "Fixed asset additions" } } }, "localname": "PaymentsToAcquirePropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PerformingFinancingReceivableMember": { "auth_ref": [ "r184", "r257" ], "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 Financing Receivable [Member]", "terseLabel": "Performing Financial Instruments" } } }, "localname": "PerformingFinancingReceivableMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PlanNameAxis": { "auth_ref": [ "r394", "r412" ], "lang": { "en-us": { "role": { "documentation": "Information by plan name for share-based payment arrangement.", "label": "Plan Name [Axis]", "terseLabel": "Plan Name" } } }, "localname": "PlanNameAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "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" } } }, "localname": "PlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PortionAtFairValueFairValueDisclosureMember": { "auth_ref": [ "r495" ], "lang": { "en-us": { "role": { "documentation": "Measured at fair value for financial reporting purposes.", "label": "Portion At Fair Value Fair Value Disclosure [Member]", "terseLabel": "Fair Value Disclosure Item Amounts [Default]" } } }, "localname": "PortionAtFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "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": "Prior Period Reclassification Adjustment Description", "terseLabel": "Reclassification" } } }, "localname": "PriorPeriodReclassificationAdjustmentDescription", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_PrivatePlacementMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "A private placement is a direct offering of securities to a limited number of sophisticated investors such as insurance companies, pension funds, mezzanine funds, stock funds and trusts.", "label": "Private Placement [Member]", "terseLabel": "Private Placement [Member]" } } }, "localname": "PrivatePlacementMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ProceedsFromContributionsFromAffiliates": { "auth_ref": [ "r72" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.", "label": "Proceeds From Contributions From Affiliates", "terseLabel": "Total interest income from affiliates" } } }, "localname": "ProceedsFromContributionsFromAffiliates", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities": { "auth_ref": [ "r67", "r68", "r206" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10120.0, "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 Available For Sale Securities", "terseLabel": "Proceeds from maturities and prepayments of investment securities, available-for-sale" } } }, "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities": { "auth_ref": [ "r68", "r206" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10130.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.", "label": "Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities", "terseLabel": "Proceeds from maturities and prepayments of investment securities, held-to-maturity" } } }, "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromRepaymentsOfShortTermDebt": { "auth_ref": [], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10050.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.", "label": "Proceeds From Repayments Of Short Term Debt", "terseLabel": "Net increase in short-term borrowings" } } }, "localname": "ProceedsFromRepaymentsOfShortTermDebt", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt": { "auth_ref": [ "r67", "r68", "r206" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10110.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash inflow from sale 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 Sale Of Available For Sale Securities Debt", "terseLabel": "Proceeds from sale of investment securities, available-for-sale" } } }, "localname": "ProceedsFromSaleOfAvailableForSaleSecuritiesDebt", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfOtherRealEstate": { "auth_ref": [ "r69" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.", "label": "Proceeds From Sale Of Other Real Estate", "negatedLabel": "Sales proceeds" } } }, "localname": "ProceedsFromSaleOfOtherRealEstate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfRepossessedAssetsActivityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfessionalFees": { "auth_ref": [ "r661", "r662" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10090.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.", "label": "Professional Fees", "terseLabel": "Fees for professional services" } } }, "localname": "ProfessionalFees", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfitLoss": { "auth_ref": [ "r4", "r46", "r49", "r53", "r75", "r93", "r105", "r113", "r114", "r144", "r150", "r154", "r157", "r160", "r246", "r324", "r325", "r326", "r329", "r330", "r331", "r333", "r335", "r337", "r338", "r443", "r446", "r447", "r452", "r453", "r483", "r499", "r614" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10180.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": { "order": 10010.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest", "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": "Profit Loss", "terseLabel": "Net income", "totalLabel": "Net income" } } }, "localname": "ProfitLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r6", "r7", "r286", "r534", "r626", "r641" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10200.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "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 of accumulated depreciation of $22,276 and $23,774, respectively" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProvisionForLoanLeaseAndOtherLosses": { "auth_ref": [ "r80", "r171", "r605" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10200.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10170.0, "parentTag": "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.", "label": "Provision For Loan Lease And Other Losses", "terseLabel": "Provision for loan and lease losses" } } }, "localname": "ProvisionForLoanLeaseAndOtherLosses", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RealEstateAcquiredThroughForeclosure": { "auth_ref": [ "r168", "r169" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10240.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.", "label": "Real Estate Acquired Through Foreclosure", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance", "terseLabel": "Other real estate owned" } } }, "localname": "RealEstateAcquiredThroughForeclosure", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RealEstateOwnedTextBlock": { "auth_ref": [ "r168" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for real estate owned (as defined). Generally, the largest component of real estate owned by lenders is assets taken in settlement of troubled loans through surrender or foreclosure. Real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned.", "label": "Real Estate Owned [Text Block]", "terseLabel": "Other Real Estate Owned and Repossessed Assets" } } }, "localname": "RealEstateOwnedTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssets" ], "xbrltype": "textBlockItemType" }, "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_ReconciliationOfRevenueFromSegmentsToConsolidatedTable": { "auth_ref": [ "r149", "r154" ], "lang": { "en-us": { "role": { "documentation": "Identification, description, and amounts of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues.", "label": "Reconciliation Of Revenue From Segments To Consolidated [Table]", "terseLabel": "Reconciliation Of Revenue From Segments To Consolidated [Table]" } } }, "localname": "ReconciliationOfRevenueFromSegmentsToConsolidatedTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ResidentialMortgageBackedSecuritiesMember": { "auth_ref": [ "r208", "r377" ], "lang": { "en-us": { "role": { "documentation": "Securities collateralized by residential real estate mortgage loans.", "label": "Residential Mortgage Backed Securities [Member]", "terseLabel": "Residential Mortgage Backed Securities [Member]" } } }, "localname": "ResidentialMortgageBackedSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestrictedStockMember": { "auth_ref": [ "r123" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestructuringAndRelatedActivitiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Restructuring And Related Activities [Abstract]" } } }, "localname": "RestructuringAndRelatedActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock": { "auth_ref": [ "r291", "r293", "r296", "r304", "r305" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.", "label": "Restructuring And Related Activities Disclosure [Text Block]", "terseLabel": "Restructuring Charges" } } }, "localname": "RestructuringAndRelatedActivitiesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringCharges" ], "xbrltype": "textBlockItemType" }, "us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expected cost remaining for the specified restructuring cost.", "label": "Restructuring And Related Cost Expected Cost Remaining1", "terseLabel": "Restructuring charges expects to incur" } } }, "localname": "RestructuringAndRelatedCostExpectedCostRemaining1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestructuringCharges": { "auth_ref": [ "r81", "r290", "r299", "r301" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.", "label": "Restructuring Charges", "terseLabel": "Pre-tax charges of restructuring", "totalLabel": "Total expenses" } } }, "localname": "RestructuringCharges", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestructuringChargesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Restructuring Charges [Abstract]", "terseLabel": "Expense Category" } } }, "localname": "RestructuringChargesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RestructuringCostAndReserveAxis": { "auth_ref": [ "r292", "r293", "r301", "r302" ], "lang": { "en-us": { "role": { "documentation": "Information by type of restructuring cost.", "label": "Restructuring Cost And Reserve [Axis]", "terseLabel": "Restructuring Type" } } }, "localname": "RestructuringCostAndReserveAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RestructuringCostAndReserveLineItems": { "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": "Restructuring Cost And Reserve [Line Items]", "terseLabel": "Restructuring Cost And Reserve [Line Items]" } } }, "localname": "RestructuringCostAndReserveLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r14", "r353", "r416", "r534", "r639", "r656", "r658" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10060.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "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.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RetainedEarningsMember": { "auth_ref": [ "r0", "r102", "r103", "r104", "r106", "r112", "r114", "r247", "r413", "r414", "r415", "r426", "r427", "r481", "r653", "r655" ], "lang": { "en-us": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Retained Earnings [Member]", "terseLabel": "Retained Earnings [Member]" } } }, "localname": "RetainedEarningsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax": { "auth_ref": [ "r135", "r136", "r149", "r155", "r156", "r162", "r163", "r165", "r367", "r368", "r570" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited": { "order": 10110.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.", "label": "Revenue From Contract With Customer Including Assessed Tax", "terseLabel": "Revenue from Contract with Customer, Including Assessed Tax" } } }, "localname": "RevenueFromContractWithCustomerIncludingAssessedTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RevenueFromContractWithCustomerPolicyTextBlock": { "auth_ref": [ "r92", "r359", "r360", "r361", "r362", "r363", "r364", "r365", "r366", "r371" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for revenue from contract with customer.", "label": "Revenue From Contract With Customer Policy [Text Block]", "terseLabel": "Revenue" } } }, "localname": "RevenueFromContractWithCustomerPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_RevenueRemainingPerformanceObligation": { "auth_ref": [ "r358" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of transaction price allocated to performance obligation that has not been recognized as revenue.", "label": "Revenue Remaining Performance Obligation", "terseLabel": "Revenue, remaining performance obligation, amount" } } }, "localname": "RevenueRemainingPerformanceObligation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SaleOfStockNameOfTransactionDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Sale of the entity's stock, including, but not limited to, initial public offering (IPO) and private placement.", "label": "Sale Of Stock Name Of Transaction [Domain]", "terseLabel": "Sale of Stock" } } }, "localname": "SaleOfStockNameOfTransactionDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock": { "auth_ref": [ "r30" ], "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 [Text Block]", "terseLabel": "Schedule of Loan Portfolio" } } }, "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable": { "auth_ref": [ "r372", "r373", "r394", "r412" ], "lang": { "en-us": { "role": { "documentation": "Schedule, table or text reflecting equity-based arrangements (such as stock or unit options and stock or unit awards) with individual employees, which are generally based on employment contracts between the entity and one or more selected officers or key employees, and which contain a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.", "label": "Schedule Of Deferred Compensation Arrangement With Individual Share Based Payments [Table]", "terseLabel": "Schedule Of Deferred Compensation Arrangement With Individual Share Based Payments [Table]" } } }, "localname": "ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDeferredCompensationPlansAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock": { "auth_ref": [ "r467" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.", "label": "Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value [Text Block]", "terseLabel": "Schedule Of Cumulative Basis Adjustments For Fair Value Hedges" } } }, "localname": "ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureDerivativeFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": { "auth_ref": [ "r122" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable": { "auth_ref": [ "r496", "r497" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTextBlock": { "auth_ref": [ "r496", "r497" ], "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 [Text Block]", "terseLabel": "Summary of Commitment and Contingent Liabilities" } } }, "localname": "ScheduleOfFairValueOffBalanceSheetRisksTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFederalHomeLoanBankAdvancesByBranchOfFHLBBankTextBlock": { "auth_ref": [ "r588", "r628", "r633" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of advances by federal home loan bank by branch.", "label": "Schedule Of Federal Home Loan Bank Advances By Branch Of F H L B Bank [Text Block]", "terseLabel": "Schedule of Available Unused Lines of Credit" } } }, "localname": "ScheduleOfFederalHomeLoanBankAdvancesByBranchOfFHLBBankTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable": { "auth_ref": [ "r257", "r262" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock": { "auth_ref": [ "r193", "r255" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of financing receivable on nonaccrual status.", "label": "Schedule Of Financing Receivables Non Accrual Status Table [Text Block]", "terseLabel": "Non-accruing Loans" } } }, "localname": "ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable": { "auth_ref": [ "r277", "r279", "r571" ], "lang": { "en-us": { "role": { "documentation": "Schedule of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Schedule Of Finite Lived Intangible Assets [Table]", "terseLabel": "Schedule Of Finite Lived Intangible Assets [Table]" } } }, "localname": "ScheduleOfFiniteLivedIntangibleAssetsTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock": { "auth_ref": [ "r275" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.", "label": "Schedule Of Intangible Assets And Goodwill Table [Text Block]", "terseLabel": "Summary of Goodwill and Other Intangible Assets" } } }, "localname": "ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfInvestmentsLineItems": { "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": "Schedule Of Investments [Line Items]", "terseLabel": "Schedule Of Investments [Line Items]" } } }, "localname": "ScheduleOfInvestmentsLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfInvestmentsTable": { "auth_ref": [ "r663" ], "lang": { "en-us": { "role": { "documentation": "A container table for all schedule of investment items. It ties in the \"Legal Entity [Axis]\" to all of its contained line items.", "label": "Schedule Of Investments [Table]", "terseLabel": "Schedule Of Investments [Table]" } } }, "localname": "ScheduleOfInvestmentsTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfOtherOperatingCostAndExpenseByComponentTextBlock": { "auth_ref": [ "r63" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of each detailed component of other operating costs and expenses that are applicable to sales and revenues, but not included in the cost of sales in the income statement.", "label": "Schedule Of Other Operating Cost And Expense By Component [Text Block]", "terseLabel": "Other Operating Expense" } } }, "localname": "ScheduleOfOtherOperatingCostAndExpenseByComponentTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfRestructuringAndRelatedCostsTable": { "auth_ref": [ "r292", "r293", "r294", "r295", "r301", "r302", "r303" ], "lang": { "en-us": { "role": { "documentation": "Table presenting the description of the restructuring costs, such as the expected cost; the costs incurred during the period; the cumulative costs incurred as of the balance sheet date; the income statement caption within which the restructuring charges recognized for the period are included; and the amount of and periodic changes to an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost by type of restructuring.", "label": "Schedule Of Restructuring And Related Costs [Table]", "terseLabel": "Schedule Of Restructuring And Related Costs [Table]" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock": { "auth_ref": [ "r297", "r298", "r300" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets.", "label": "Schedule Of Restructuring And Related Costs [Text Block]", "terseLabel": "Scheduled of Restructuring Charges" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock": { "auth_ref": [ "r144", "r147", "r153", "r275" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.", "label": "Schedule Of Segment Reporting Information By Segment [Text Block]", "terseLabel": "Schedule of Segment Reporting Information, by Segment" } } }, "localname": "ScheduleOfSegmentReportingInformationBySegmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": { "auth_ref": [ "r394", "r412" ], "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": "Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]" } } }, "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock": { "auth_ref": [ "r397", "r405", "r407" ], "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": "Schedule Of Share Based Compensation Stock Options Activity Table [Text Block]", "terseLabel": "Stock Option Activity" } } }, "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock": { "auth_ref": [ "r409" ], "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": "Schedule of Fair Value Assumptions" } } }, "localname": "ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShortTermDebtTable": { "auth_ref": [ "r20" ], "lang": { "en-us": { "role": { "documentation": "A table or schedule providing information pertaining to borrowings under which repayment was required in less than twelve months (or normal operating cycle, if longer) after its issuance. It may include: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date and measures of the maximum and average amount outstanding during the period; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.", "label": "Schedule Of Short Term Debt [Table]", "terseLabel": "Schedule Of Short Term Debt [Table]" } } }, "localname": "ScheduleOfShortTermDebtTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock": { "auth_ref": [ "r238" ], "lang": { "en-us": { "role": { "documentation": "For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).", "label": "Schedule Of Unrealized Loss On Investments Table [Text Block]", "terseLabel": "Schedule of Unrealized Loss on Investments" } } }, "localname": "ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock": { "auth_ref": [ "r279" ], "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": "Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block]", "terseLabel": "Schedule of Estimated Remaining Amortization Expense" } } }, "localname": "ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_SecuritiesSoldUnderAgreementsToRepurchase": { "auth_ref": [ "r32", "r33", "r97", "r98", "r586" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.", "label": "Securities Sold Under Agreements To Repurchase", "terseLabel": "Securities Sold under Agreements to Repurchase, Total" } } }, "localname": "SecuritiesSoldUnderAgreementsToRepurchase", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SegmentDomain": { "auth_ref": [ "r131", "r135", "r136", "r137", "r138", "r139", "r140", "r141", "r142", "r143", "r144", "r145", "r146", "r149", "r150", "r151", "r152", "r154", "r155", "r156", "r157", "r158", "r160", "r165", "r295", "r303", "r649" ], "lang": { "en-us": { "role": { "documentation": "Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.", "label": "Segment [Domain]", "terseLabel": "Segments" } } }, "localname": "SegmentDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SegmentReportingAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Segment Reporting [Abstract]" } } }, "localname": "SegmentReportingAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]" } } }, "localname": "SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_SegmentReportingDisclosureTextBlock": { "auth_ref": [ "r131", "r133", "r134", "r144", "r148", "r154", "r158", "r159", "r160", "r161", "r162", "r164", "r165", "r166" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.", "label": "Segment Reporting Disclosure [Text Block]", "terseLabel": "Segment Reporting" } } }, "localname": "SegmentReportingDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReporting" ], "xbrltype": "textBlockItemType" }, "us-gaap_SegmentReportingRevenueReconcilingItemLineItems": { "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": "Segment Reporting Revenue Reconciling Item [Line Items]", "terseLabel": "Segment Reporting Revenue Reconciling Item [Line Items]" } } }, "localname": "SegmentReportingRevenueReconcilingItemLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SelfInsuranceReserve": { "auth_ref": [ "r27" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.", "label": "Self Insurance Reserve", "terseLabel": "Self Insurance Reserve" } } }, "localname": "SelfInsuranceReserve", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ServiceMember": { "auth_ref": [ "r370" ], "lang": { "en-us": { "role": { "documentation": "Assistance, including, but not limited to, technology, license and maintenance, license and service, maintenance, oil and gas, and financial service.", "label": "Service [Member]", "terseLabel": "Service [Member]" } } }, "localname": "ServiceMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_SeveranceCosts1": { "auth_ref": [ "r81" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails": { "order": 10010.0, "parentTag": "us-gaap_RestructuringCharges", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.", "label": "Severance Costs1", "terseLabel": "Severance and personnel expenses" } } }, "localname": "SeveranceCosts1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensation": { "auth_ref": [ "r80" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited": { "order": 10230.0, "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", "terseLabel": "Stock-based compensation expense" } } }, "localname": "ShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": { "auth_ref": [ "r395" ], "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 Period1", "terseLabel": "Share-based compensation arrangement by share-based payment award, award vesting period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": { "auth_ref": [ "r404" ], "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": "Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "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.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber": { "auth_ref": [ "r400" ], "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": "Options exercisable, end of period (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice": { "auth_ref": [ "r400" ], "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": "Options exercisable, end of period, average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod": { "auth_ref": [ "r403" ], "lang": { "en-us": { "role": { "documentation": "Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period", "terseLabel": "Expired (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod": { "auth_ref": [ "r402" ], "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", "terseLabel": "Forfeited (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "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": "Granted (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue": { "auth_ref": [ "r412" ], "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", "terseLabel": "Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber": { "auth_ref": [ "r399", "r412" ], "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": "Options outstanding, end of period (in shares)", "periodStartLabel": "Outstanding, beginning of period (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward": { "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": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward", "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": { "auth_ref": [ "r398" ], "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": "Options outstanding, end of period, average exercise price (in dollars per share)", "periodStartLabel": "Outstanding, beginning of period, average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": { "auth_ref": [ "r391", "r396" ], "lang": { "en-us": { "role": { "documentation": "Award under share-based payment arrangement.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain]", "terseLabel": "Award Type" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "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": "Exercised, average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price", "terseLabel": "Expired, average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "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": "Forfeited, average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "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": "Granted, average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1": { "auth_ref": [ "r408" ], "lang": { "en-us": { "role": { "documentation": "Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1", "terseLabel": "Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, weighted average remaining contractual term" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharesOutstanding": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of shares issued which are neither cancelled nor held in the treasury.", "label": "Shares Outstanding", "periodEndLabel": "Balance (in shares)", "periodStartLabel": "Balance (in shares)" } } }, "localname": "SharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "sharesItemType" }, "us-gaap_ShortTermBorrowings": { "auth_ref": [ "r9", "r534", "r580", "r636" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10110.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.", "label": "Short Term Borrowings", "terseLabel": "Short-term borrowings" } } }, "localname": "ShortTermBorrowings", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShortTermDebtLineItems": { "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": "Short Term Debt [Line Items]", "terseLabel": "Short Term Debt [Line Items]" } } }, "localname": "ShortTermDebtLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTextBlock": { "auth_ref": [ "r349" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for short-term debt.", "label": "Short Term Debt [Text Block]", "terseLabel": "Short-Term Borrowings" } } }, "localname": "ShortTermDebtTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureShortTermBorrowings" ], "xbrltype": "textBlockItemType" }, "us-gaap_ShortTermDebtTypeAxis": { "auth_ref": [ "r20" ], "lang": { "en-us": { "role": { "documentation": "Information by type of short-term debt arrangement.", "label": "Short Term Debt Type [Axis]", "terseLabel": "Short-term Debt, Type" } } }, "localname": "ShortTermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTypeDomain": { "auth_ref": [ "r19" ], "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]", "terseLabel": "Short-term Debt, Type" } } }, "localname": "ShortTermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShorttermDebtFairValue": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.", "label": "Shortterm Debt Fair Value", "terseLabel": "Short-term borrowings" } } }, "localname": "ShorttermDebtFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsEstimatedFairValueAndRelatedCarryingOrNotionalAmountsOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SignificantAccountingPoliciesTextBlock": { "auth_ref": [ "r91", "r101" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.", "label": "Significant Accounting Policies [Text Block]", "terseLabel": "Basis of Presentation" } } }, "localname": "SignificantAccountingPoliciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentation" ], "xbrltype": "textBlockItemType" }, "us-gaap_SpecialMentionMember": { "auth_ref": [ "r184", "r257" ], "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": "Special Mention" } } }, "localname": "SpecialMentionMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StandbyLettersOfCreditMember": { "auth_ref": [ "r317", "r321", "r440", "r660" ], "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.firstusbank.com/20210930/taxonomy/role/DisclosureGuaranteesCommitmentsAndContingenciesSummaryOfCommitmentAndContingentLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StatementBusinessSegmentsAxis": { "auth_ref": [ "r3", "r131", "r135", "r136", "r137", "r138", "r139", "r140", "r141", "r142", "r143", "r144", "r145", "r146", "r149", "r150", "r151", "r152", "r154", "r155", "r156", "r157", "r158", "r160", "r165", "r275", "r289", "r295", "r303", "r649" ], "lang": { "en-us": { "role": { "documentation": "Information by business segments.", "label": "Statement Business Segments [Axis]", "terseLabel": "FUSB [Member]" } } }, "localname": "StatementBusinessSegmentsAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureSegmentReportingResultsForReportableSegmentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_StatementEquityComponentsAxis": { "auth_ref": [ "r0", "r29", "r51", "r52", "r53", "r102", "r103", "r104", "r106", "r112", "r114", "r128", "r247", "r352", "r353", "r413", "r414", "r415", "r426", "r427", "r481", "r501", "r502", "r503", "r504", "r505", "r507", "r653", "r654", "r655", "r701" ], "lang": { "en-us": { "role": { "documentation": "Information by component of equity.", "label": "Statement Equity Components [Axis]", "terseLabel": "Additional Paid-in Capital [Member]" } } }, "localname": "StatementEquityComponentsAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "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]", "terseLabel": "Statement [Line Items]" } } }, "localname": "StatementLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "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 Income And 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": [ "r102", "r103", "r104", "r128", "r570" ], "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]", "terseLabel": "Statement [Table]" } } }, "localname": "StatementTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAgingAnalysisOfPastDueLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesImpairedLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansModifiedInTroubledDebtRestructuringDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesNonAccruingLoansDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesScheduleOfLoanPortfolioParentheticalDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation": { "auth_ref": [ "r11", "r12", "r352", "r353" ], "lang": { "en-us": { "role": { "documentation": "Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).", "label": "Stock Issued During Period Shares Share Based Compensation", "terseLabel": "Impact of stock-based compensation plans, net (in shares)" } } }, "localname": "StockIssuedDuringPeriodSharesShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": { "auth_ref": [ "r11", "r12", "r352", "r353", "r401" ], "lang": { "en-us": { "role": { "documentation": "Number of share options (or share units) exercised during the current period.", "label": "Stock Issued During Period Shares Stock Options Exercised", "terseLabel": "Exercised (in shares)" } } }, "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureStockAwardsStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued": { "auth_ref": [ "r12", "r352", "r353" ], "lang": { "en-us": { "role": { "documentation": "Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.", "label": "Stock Issued During Period Shares Treasury Stock Reissued", "terseLabel": "Reissuance of treasury stock as compensation (in shares)" } } }, "localname": "StockIssuedDuringPeriodSharesTreasuryStockReissued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation": { "auth_ref": [ "r11", "r12", "r353", "r393", "r406" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).", "label": "Stock Issued During Period Value Share Based Compensation", "terseLabel": "Impact of stock-based compensation plans, net" } } }, "localname": "StockIssuedDuringPeriodValueShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued": { "auth_ref": [ "r11", "r12", "r352", "r353", "r354" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.", "label": "Stock Issued During Period Value Treasury Stock Reissued", "terseLabel": "Reissuance of treasury stock as compensation" } } }, "localname": "StockIssuedDuringPeriodValueTreasuryStockReissued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Stockholders Equity [Abstract]", "terseLabel": "Shareholders\u2019 equity:" } } }, "localname": "StockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest": { "auth_ref": [ "r0", "r1", "r52", "r93", "r102", "r103", "r104", "r106", "r112", "r246", "r247", "r353", "r413", "r414", "r415", "r426", "r427", "r441", "r442", "r451", "r481", "r499", "r501", "r502", "r507", "r654", "r655", "r701" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10020.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.", "label": "Stockholders Equity Including Portion Attributable To Noncontrolling Interest", "periodEndLabel": "Ending balance, value", "periodStartLabel": "Beginning balance, value", "totalLabel": "Total shareholders\u2019 equity" } } }, "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited", "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_SubordinatedDebtMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "This element represents domestic or foreign subordinated debt. Subordinated debt has a lower priority of repayment in liquidation of the entity's assets.", "label": "Subordinated Debt [Member]", "terseLabel": "Subordinated Debt [Member]" } } }, "localname": "SubordinatedDebtMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsequentEventMember": { "auth_ref": [ "r508", "r535" ], "lang": { "en-us": { "role": { "documentation": "Identifies event that occurred after the balance sheet date but before financial statements are issued or available to be issued.", "label": "Subsequent Event [Member]", "terseLabel": "Subsequent Event [Member]" } } }, "localname": "SubsequentEventMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsequentEventTypeAxis": { "auth_ref": [ "r508", "r535" ], "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" } } }, "localname": "SubsequentEventTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubsequentEventTypeDomain": { "auth_ref": [ "r508", "r535" ], "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" } } }, "localname": "SubsequentEventTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsidiarySaleOfStockAxis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Information by type of sale of the entity's stock.", "label": "Subsidiary Sale Of Stock [Axis]", "terseLabel": "Sale of Stock" } } }, "localname": "SubsidiarySaleOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubstandardMember": { "auth_ref": [ "r184", "r257" ], "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" } } }, "localname": "SubstandardMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesLoansByCreditQualityIndicatorsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SupplementalCashFlowInformationAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Supplemental Cash Flow Information [Abstract]", "terseLabel": "Supplemental disclosures:" } } }, "localname": "SupplementalCashFlowInformationAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_SuppliesAndPostageExpense": { "auth_ref": [ "r609" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails": { "order": 10010.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The aggregate amount of expenses directly related to the supplies and postage.", "label": "Supplies And Postage Expense", "terseLabel": "Postage, stationery and supplies" } } }, "localname": "SuppliesAndPostageExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherOperatingIncomeAndExpenseOtherOperatingExpenseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TransferToOtherRealEstate": { "auth_ref": [ "r87", "r88", "r89" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.", "label": "Transfer To Other Real Estate", "verboseLabel": "Additions" } } }, "localname": "TransferToOtherRealEstate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureOtherRealEstateOwnedAndRepossessedAssetsSummaryOfForeclosedPropertyActivityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": { "auth_ref": [ "r227", "r231", "r243", "r244", "r245", "r345", "r351", "r480", "r537", "r538", "r539", "r540", "r541", "r542", "r543", "r544", "r545", "r546", "r547", "r548", "r549", "r550", "r552", "r553", "r554", "r555", "r556", "r557", "r558", "r559", "r560", "r561", "r562", "r563", "r564", "r565", "r566", "r567", "r685", "r686", "r687", "r688", "r689", "r690", "r691" ], "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": "Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain]", "terseLabel": "Financial Instruments" } } }, "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockMember": { "auth_ref": [ "r28", "r354" ], "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 [Member]" } } }, "localname": "TreasuryStockMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockShares": { "auth_ref": [ "r28", "r354" ], "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, shares (in shares)" } } }, "localname": "TreasuryStockShares", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnauditedParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_TreasuryStockSharesAcquired": { "auth_ref": [ "r12", "r352", "r353" ], "lang": { "en-us": { "role": { "documentation": "Number of shares that have been repurchased during the period and are being held in treasury.", "label": "Treasury Stock Shares Acquired", "negatedLabel": "Treasury stock repurchases (in shares)" } } }, "localname": "TreasuryStockSharesAcquired", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "sharesItemType" }, "us-gaap_TreasuryStockValue": { "auth_ref": [ "r28", "r354", "r355" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited": { "order": 10070.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "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: 1,416,792 and 1,419,795 shares at cost, respectively" } } }, "localname": "TreasuryStockValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedBalanceSheetsCurrentPeriodUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_TreasuryStockValueAcquiredCostMethod": { "auth_ref": [ "r352", "r353", "r354" ], "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": "Treasury stock repurchases" } } }, "localname": "TreasuryStockValueAcquiredCostMethod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/StatementInterimCondensedConsolidatedStatementsOfChangesInShareholdersEquityUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock": { "auth_ref": [ "r186", "r187" ], "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": "Loans Modified in a Troubled Debt Restructuring" } } }, "localname": "TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureLoansAndAllowanceForLoanAndLeaseLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_TypeOfRestructuringDomain": { "auth_ref": [ "r292", "r293", "r301", "r302" ], "lang": { "en-us": { "role": { "documentation": "Identification of the types of restructuring costs.", "label": "Type Of Restructuring [Domain]", "terseLabel": "Type of Restructuring" } } }, "localname": "TypeOfRestructuringDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesAdditionalInformationDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureRestructuringChargesScheduledOfRestructuringChargesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_USGovernmentAgenciesDebtSecuritiesMember": { "auth_ref": [ "r99", "r377", "r615" ], "lang": { "en-us": { "role": { "documentation": "Debentures, notes, and other debt securities issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae). Excludes US treasury securities and debt issued by government-sponsored Enterprises (GSEs), for example, but is not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB).", "label": "U S Government Agencies Debt Securities [Member]", "terseLabel": "US Government Agencies Debt Securities [Member]" } } }, "localname": "USGovernmentAgenciesDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails" ], "xbrltype": "domainItemType" }, "us-gaap_USStatesAndPoliticalSubdivisionsMember": { "auth_ref": [ "r377", "r659" ], "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": "U S States And Political Subdivisions [Member]", "terseLabel": "US States and Political Subdivisions Debt Securities [Member]" } } }, "localname": "USStatesAndPoliticalSubdivisionsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_USTreasurySecuritiesMember": { "auth_ref": [ "r99", "r377", "r384", "r615" ], "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": "U S Treasury Securities [Member]", "terseLabel": "US Treasury Securities [Member]" } } }, "localname": "USTreasurySecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAssetsMeasuredAtFairValueOnRecurringBasisDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails", "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureInvestmentSecuritiesSecuritiesInContinuousUnrealizedLossPositionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_UnusedLinesOfCreditMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The unused portion of a line of credit that is available to the borrower to withdrawn upon.", "label": "Unused Lines Of Credit [Member]", "terseLabel": "Unused lines of Credit [Member]" } } }, "localname": "UnusedLinesOfCreditMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBorrowingsScheduleOfAvailableUnusedLinesOfCreditDetails" ], "xbrltype": "domainItemType" }, "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment": { "auth_ref": [ "r122" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails": { "order": 10020.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "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", "terseLabel": "Dilutive shares" } } }, "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": { "auth_ref": [ "r117", "r122" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "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 Diluted Shares Outstanding", "totalLabel": "Diluted shares" } } }, "localname": "WeightedAverageNumberOfDilutedSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": { "auth_ref": [ "r116", "r122" ], "calculation": { "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails": { "order": 10010.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "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": "Basic shares" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingBasic", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://www.firstusbank.com/20210930/taxonomy/role/DisclosureBasisOfPresentationBasicAndDilutedNetIncomePerShareDetails" ], "xbrltype": "sharesItemType" } }, "unitCount": 11 } }, "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(22))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r100": { "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" }, "r101": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "235", "URI": "http://asc.fasb.org/topic&trid=2122369" }, "r102": { "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" }, "r103": { "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" }, "r104": { "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" }, "r105": { "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" }, "r106": { "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" }, "r107": { "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" }, "r108": { "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" }, "r109": { "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" }, "r11": { "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" }, "r110": { "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" }, "r111": { "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" }, "r112": { "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" }, "r113": { "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" }, "r114": { "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" }, "r115": { "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" }, "r116": { "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" }, "r117": { "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" }, "r118": { "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" }, "r119": { "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" }, "r12": { "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" }, "r120": { "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" }, "r121": { "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" }, "r122": { "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" }, "r123": { "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" }, "r124": { "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" }, "r125": { "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" }, "r126": { "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" }, "r127": { "Name": "Accounting Standards Codification", "Paragraph": "6A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306" }, "r128": { "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" }, "r129": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r13": { "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" }, "r130": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "275", "URI": "http://asc.fasb.org/topic&trid=2134479" }, "r131": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8657-108599" }, "r132": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599" }, "r133": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8721-108599" }, "r134": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8721-108599" }, "r135": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r137": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r138": { "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" }, "r139": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r14": { "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" }, "r140": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r141": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r142": { "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" }, "r143": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(j)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r144": { "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" }, "r145": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599" }, "r146": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599" }, "r147": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599" }, "r148": { "Name": "Accounting Standards Codification", "Paragraph": "26", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8844-108599" }, "r149": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599" }, "r15": { "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" }, "r150": { "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" }, "r151": { "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" }, "r152": { "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" }, "r153": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599" }, "r154": { "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" }, "r155": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599" }, "r156": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599" }, "r157": { "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" }, "r158": { "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" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599" }, "r16": { "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" }, "r160": { "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" }, "r161": { "Name": "Accounting Standards Codification", "Paragraph": "34", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8981-108599" }, "r162": { "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" }, "r163": { "Name": "Accounting Standards Codification", "Paragraph": "41", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "41", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599" }, "r165": { "Name": "Accounting Standards Codification", "Paragraph": "42", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599" }, "r166": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "280", "URI": "http://asc.fasb.org/topic&trid=2134510" }, "r167": { "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" }, "r168": { "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" }, "r169": { "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" }, "r17": { "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" }, "r170": { "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" }, "r171": { "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" }, "r172": { "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" }, "r173": { "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" }, "r174": { "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" }, "r175": { "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" }, "r176": { "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" }, "r177": { "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" }, "r178": { "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" }, "r179": { "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" }, "r18": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.12)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r180": { "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" }, "r181": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(3)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524" }, "r182": { "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" }, "r183": { "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" }, "r184": { "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" }, "r185": { "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" }, "r186": { "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" }, "r187": { "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" }, "r188": { "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" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524" }, "r19": { "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" }, "r190": { "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" }, "r191": { "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" }, "r192": { "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" }, "r193": { "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" }, "r194": { "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" }, "r195": { "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" }, "r196": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/subtopic&trid=2196772" }, "r197": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "35", "SubTopic": "20", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=124402152&loc=d3e8622-111531" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "15", "SubTopic": "30", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538" }, "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 210.5-02.19)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(3)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544" }, "r201": { "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" }, "r202": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "30", "Topic": "310", "URI": "http://asc.fasb.org/subtopic&trid=2196854" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554" }, "r204": { "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" }, "r205": { "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" }, "r206": { "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" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "8A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562" }, "r208": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL6283291-111563" }, "r209": { "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" }, "r21": { "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" }, "r210": { "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" }, "r211": { "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" }, "r212": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563" }, "r213": { "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" }, "r214": { "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" }, "r215": { "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" }, "r216": { "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" }, "r217": { "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" }, "r218": { "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" }, "r219": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r22": { "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" }, "r220": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(aa)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(1)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r225": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(3)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r226": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(4)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563" }, "r227": { "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" }, "r228": { "Name": "Accounting Standards Codification", "Paragraph": "5A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563" }, "r229": { "Name": "Accounting Standards Codification", "Paragraph": "5A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563" }, "r23": { "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" }, "r230": { "Name": "Accounting Standards Codification", "Paragraph": "5A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563" }, "r231": { "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" }, "r232": { "Name": "Accounting Standards Codification", "Paragraph": "5B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269825-111563" }, "r233": { "Name": "Accounting Standards Codification", "Paragraph": "5B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269825-111563" }, "r234": { "Name": "Accounting Standards Codification", "Paragraph": "5B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269825-111563" }, "r235": { "Name": "Accounting Standards Codification", "Paragraph": "5B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=SL120269825-111563" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563" }, "r237": { "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" }, "r238": { "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" }, "r239": { "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" }, "r24": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22(a)(2))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r240": { "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" }, "r241": { "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" }, "r242": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "320", "URI": "http://asc.fasb.org/topic&trid=2196928" }, "r243": { "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" }, "r244": { "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" }, "r245": { "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" }, "r246": { "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" }, "r247": { "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" }, "r248": { "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" }, "r249": { "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" }, "r25": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22(a)(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r250": { "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" }, "r251": { "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" }, "r252": { "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" }, "r253": { "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" }, "r254": { "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" }, "r255": { "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" }, "r256": { "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" }, "r257": { "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" }, "r258": { "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" }, "r259": { "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" }, "r26": { "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" }, "r260": { "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" }, "r261": { "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" }, "r262": { "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" }, "r263": { "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" }, "r264": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/subtopic&trid=82887181" }, "r265": { "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" }, "r266": { "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" }, "r267": { "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" }, "r268": { "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" }, "r269": { "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" }, "r27": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.24)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r270": { "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" }, "r271": { "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" }, "r272": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/subtopic&trid=82887182" }, "r273": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266" }, "r274": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975" }, "r275": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267" }, "r276": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274" }, "r277": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r278": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r279": { "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" }, "r28": { "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" }, "r280": { "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" }, "r281": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(2)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r282": { "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" }, "r283": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r284": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "350", "URI": "http://asc.fasb.org/topic&trid=2144416" }, "r285": { "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" }, "r286": { "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" }, "r287": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230" }, "r288": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r289": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r29": { "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" }, "r290": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868" }, "r291": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r292": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(1)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r293": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(2)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r294": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r295": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r296": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r297": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r298": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 5.P.3)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747" }, "r299": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.3)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747" }, "r3": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760" }, "r30": { "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" }, "r300": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 5.P.4)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r301": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(b)(1))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r302": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(b)(2))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r303": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(d))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r304": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(e))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r305": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "420", "URI": "http://asc.fasb.org/topic&trid=2175745" }, "r306": { "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" }, "r307": { "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" }, "r308": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r309": { "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" }, "r31": { "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" }, "r310": { "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" }, "r311": { "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" }, "r312": { "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" }, "r313": { "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" }, "r314": { "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" }, "r315": { "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" }, "r316": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "450", "URI": "http://asc.fasb.org/topic&trid=2127136" }, "r317": { "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" }, "r318": { "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" }, "r319": { "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" }, "r32": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312" }, "r320": { "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" }, "r321": { "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" }, "r322": { "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" }, "r323": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=123465755&loc=SL6230698-112601" }, "r324": { "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" }, "r325": { "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" }, "r326": { "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" }, "r327": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(4)(iii)(B))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r328": { "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" }, "r329": { "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" }, "r33": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313" }, "r330": { "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" }, "r331": { "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" }, "r332": { "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" }, "r333": { "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" }, "r334": { "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" }, "r335": { "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" }, "r336": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-02(a)(4)(iii)(C))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756" }, "r337": { "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" }, "r338": { "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" }, "r339": { "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" }, "r34": { "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" }, "r340": { "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" }, "r341": { "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" }, "r342": { "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" }, "r343": { "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" }, "r344": { "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" }, "r345": { "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" }, "r346": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870" }, "r347": { "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" }, "r348": { "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" }, "r349": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "470", "URI": "http://asc.fasb.org/topic&trid=2208564" }, "r35": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580" }, "r350": { "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" }, "r351": { "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" }, "r352": { "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" }, "r353": { "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" }, "r354": { "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" }, "r355": { "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" }, "r356": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044" }, "r357": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044" }, "r358": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045" }, "r359": { "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" }, "r36": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(dd)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580" }, "r360": { "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" }, "r361": { "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" }, "r362": { "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" }, "r363": { "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" }, "r364": { "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" }, "r365": { "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" }, "r366": { "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" }, "r367": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045" }, "r368": { "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" }, "r369": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045" }, "r37": { "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" }, "r370": { "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" }, "r371": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "606", "URI": "http://asc.fasb.org/topic&trid=49130388" }, "r372": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "30", "SubTopic": "10", "Topic": "710", "URI": "http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363" }, "r373": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "710", "URI": "http://asc.fasb.org/extlink&oid=6409961&loc=d3e20517-108367" }, "r374": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "710", "URI": "http://asc.fasb.org/topic&trid=2127225" }, "r375": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "712", "URI": "http://asc.fasb.org/topic&trid=2197446" }, "r376": { "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" }, "r377": { "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" }, "r378": { "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" }, "r379": { "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" }, "r38": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580" }, "r380": { "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" }, "r381": { "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" }, "r382": { "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" }, "r383": { "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" }, "r384": { "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" }, "r385": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(a)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947" }, "r386": { "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" }, "r387": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(f)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947" }, "r388": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(a)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947" }, "r389": { "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" }, "r39": { "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" }, "r390": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "715", "URI": "http://asc.fasb.org/topic&trid=2235017" }, "r391": { "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" }, "r392": { "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" }, "r393": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901" }, "r394": { "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" }, "r395": { "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" }, "r396": { "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" }, "r397": { "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" }, "r398": { "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" }, "r399": { "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" }, "r4": { "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" }, "r40": { "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" }, "r400": { "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" }, "r401": { "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" }, "r402": { "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" }, "r403": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(4)", "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": "(c)(2)(iii)(1)", "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": "(d)", "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": "(d)(1)", "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": "(e)", "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": "(e)(1)", "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)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r41": { "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" }, "r410": { "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" }, "r411": { "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" }, "r412": { "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" }, "r413": { "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" }, "r414": { "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" }, "r415": { "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" }, "r416": { "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" }, "r417": { "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" }, "r418": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "718", "URI": "http://asc.fasb.org/topic&trid=2228938" }, "r419": { "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" }, "r42": { "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" }, "r420": { "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" }, "r421": { "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" }, "r422": { "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" }, "r423": { "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" }, "r424": { "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" }, "r425": { "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" }, "r426": { "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" }, "r427": { "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" }, "r428": { "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" }, "r429": { "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" }, "r43": { "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" }, "r430": { "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" }, "r431": { "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" }, "r432": { "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" }, "r433": { "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" }, "r434": { "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" }, "r435": { "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" }, "r436": { "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" }, "r437": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "740", "URI": "http://asc.fasb.org/topic&trid=2144680" }, "r438": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463" }, "r439": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463" }, "r44": { "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" }, "r440": { "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" }, "r441": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=123454820&loc=SL4568447-111683" }, "r442": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=123454820&loc=SL4568740-111683" }, "r443": { "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" }, "r444": { "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" }, "r445": { "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" }, "r446": { "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" }, "r447": { "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" }, "r448": { "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" }, "r449": { "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" }, "r45": { "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" }, "r450": { "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" }, "r451": { "Name": "Accounting Standards Codification", "Paragraph": "4I", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4590271-111686" }, "r452": { "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" }, "r453": { "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" }, "r454": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5579240-113959" }, "r455": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959" }, "r456": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959" }, "r457": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959" }, "r458": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)(i)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=d3e41620-113959" }, "r459": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)(ii)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=d3e41620-113959" }, "r46": { "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" }, "r460": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=d3e41620-113959" }, "r461": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=d3e41638-113959" }, "r462": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959" }, "r463": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959" }, "r464": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(1)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959" }, "r465": { "Name": "Accounting Standards Codification", "Paragraph": "4B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959" }, "r466": { "Name": "Accounting Standards Codification", "Paragraph": "4B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959" }, "r467": { "Name": "Accounting Standards Codification", "Paragraph": "4B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959" }, "r468": { "Name": "Accounting Standards Codification", "Paragraph": "4C", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bb)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959" }, "r469": { "Name": "Accounting Standards Codification", "Paragraph": "4C", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959" }, "r47": { "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" }, "r470": { "Name": "Accounting Standards Codification", "Paragraph": "4C", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959" }, "r471": { "Name": "Accounting Standards Codification", "Paragraph": "4D", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959" }, "r472": { "Name": "Accounting Standards Codification", "Paragraph": "4D", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959" }, "r473": { "Name": "Accounting Standards Codification", "Paragraph": "4E", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL5624181-113959" }, "r474": { "Name": "Accounting Standards Codification", "Paragraph": "4EE", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959" }, "r475": { "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" }, "r476": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=d3e41641-113959" }, "r477": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959" }, "r478": { "Name": "Accounting Standards Codification", "Paragraph": "182", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123421605&loc=SL5629052-113961" }, "r479": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "25", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986" }, "r48": { "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" }, "r480": { "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" }, "r481": { "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" }, "r482": { "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" }, "r483": { "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" }, "r484": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "815", "URI": "http://asc.fasb.org/topic&trid=2229140" }, "r485": { "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" }, "r486": { "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" }, "r487": { "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" }, "r488": { "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" }, "r489": { "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" }, "r49": { "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" }, "r490": { "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" }, "r491": { "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" }, "r492": { "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" }, "r493": { "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" }, "r494": { "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" }, "r495": { "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" }, "r496": { "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" }, "r497": { "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" }, "r498": { "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" }, "r499": { "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" }, "r5": { "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" }, "r50": { "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" }, "r500": { "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" }, "r501": { "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" }, "r502": { "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" }, "r503": { "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" }, "r504": { "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" }, "r505": { "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" }, "r506": { "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" }, "r507": { "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" }, "r508": { "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" }, "r509": { "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" }, "r51": { "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" }, "r510": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399" }, "r511": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399" }, "r512": { "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" }, "r513": { "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" }, "r514": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400" }, "r515": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=123386454&loc=d3e45280-112737" }, "r516": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(4)", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=123392090&loc=d3e45377-112738" }, "r517": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977" }, "r518": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977" }, "r519": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977" }, "r52": { "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" }, "r520": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980" }, "r521": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980" }, "r522": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(1)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980" }, "r523": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980" }, "r524": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(4)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980" }, "r525": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980" }, "r526": { "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" }, "r527": { "Name": "Accounting Standards Codification", "Paragraph": "53", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971" }, "r528": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/subtopic&trid=77888251" }, "r529": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978" }, "r53": { "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" }, "r530": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981" }, "r531": { "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" }, "r532": { "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" }, "r533": { "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" }, "r534": { "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" }, "r535": { "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" }, "r536": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "855", "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314020-165662" }, "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": "15", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581" }, "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)(1)", "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)(2)", "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)(3)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r546": { "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" }, "r547": { "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" }, "r548": { "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" }, "r549": { "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" }, "r55": { "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" }, "r550": { "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" }, "r551": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)(1)(i)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729" }, "r552": { "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" }, "r553": { "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" }, "r554": { "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" }, "r555": { "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" }, "r556": { "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" }, "r557": { "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" }, "r558": { "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" }, "r559": { "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" }, "r56": { "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" }, "r560": { "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" }, "r561": { "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" }, "r562": { "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" }, "r563": { "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" }, "r564": { "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" }, "r565": { "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" }, "r566": { "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" }, "r567": { "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" }, "r568": { "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" }, "r569": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "310", "Subparagraph": "(b)", "Topic": "912", "URI": "http://asc.fasb.org/extlink&oid=123371682&loc=d3e55415-109406" }, "r57": { "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" }, "r570": { "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" }, "r571": { "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" }, "r572": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "340", "Topic": "928", "URI": "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004" }, "r573": { "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" }, "r574": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "940", "URI": "http://asc.fasb.org/subtopic&trid=2176304" }, "r575": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "210", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117340910&loc=d3e59706-112781" }, "r576": { "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" }, "r577": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(10)(1))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r578": { "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" }, "r579": { "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" }, "r58": { "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" }, "r580": { "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" }, "r581": { "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" }, "r582": { "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" }, "r583": { "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" }, "r584": { "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" }, "r585": { "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" }, "r586": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.13(1))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r587": { "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" }, "r588": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.13,16)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r589": { "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" }, "r59": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(22))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r590": { "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" }, "r591": { "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" }, "r592": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.2)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r593": { "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" }, "r594": { "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" }, "r595": { "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" }, "r596": { "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" }, "r597": { "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" }, "r598": { "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" }, "r599": { "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" }, "r6": { "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" }, "r60": { "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" }, "r600": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(24))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260" }, "r601": { "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" }, "r602": { "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" }, "r603": { "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" }, "r604": { "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" }, "r605": { "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" }, "r606": { "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" }, "r607": { "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" }, "r608": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.14(b))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260" }, "r609": { "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" }, "r61": { "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" }, "r610": { "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" }, "r611": { "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" }, "r612": { "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" }, "r613": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "230", "Subparagraph": "(a)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123398031&loc=d3e60009-112784" }, "r614": { "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" }, "r615": { "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" }, "r616": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(a)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803" }, "r617": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(b)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803" }, "r618": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(c)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803" }, "r619": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(d)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803" }, "r62": { "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" }, "r620": { "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" }, "r621": { "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" }, "r622": { "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" }, "r623": { "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" }, "r624": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "942", "URI": "http://asc.fasb.org/subtopic&trid=2209399" }, "r625": { "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" }, "r626": { "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" }, "r627": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "405", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817" }, "r628": { "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" }, "r629": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599511&loc=d3e64684-112823" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.3)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r630": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599511&loc=d3e64702-112823" }, "r631": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Subparagraph": "(c)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823" }, "r632": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Subparagraph": "(d)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823" }, "r633": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823" }, "r634": { "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" }, "r635": { "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" }, "r636": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(16)(a)(1))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r637": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(16))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r638": { "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" }, "r639": { "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" }, "r64": { "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" }, "r640": { "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" }, "r641": { "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" }, "r642": { "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" }, "r643": { "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" }, "r644": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(20))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263" }, "r645": { "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" }, "r646": { "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" }, "r647": { "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" }, "r648": { "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" }, "r649": { "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" }, "r65": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.6)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r650": { "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" }, "r651": { "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" }, "r652": { "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" }, "r653": { "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" }, "r654": { "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" }, "r655": { "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" }, "r656": { "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" }, "r657": { "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" }, "r658": { "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" }, "r659": { "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" }, "r66": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.8)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r660": { "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" }, "r661": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "220", "Subparagraph": "(k)", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=124433917&loc=SL114874205-224268" }, "r662": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.6-07.2(a),(b),(c),(d))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272" }, "r663": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12)", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611133-123010" }, "r664": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "946", "URI": "http://asc.fasb.org/subtopic&trid=2324412" }, "r665": { "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" }, "r666": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "210", "Topic": "954", "URI": "http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580" }, "r667": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "210", "Topic": "954", "URI": "http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581" }, "r668": { "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" }, "r669": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column B))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r67": { "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" }, "r670": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column C))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r671": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column D))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r672": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column E))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r673": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column F))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r674": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column G))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r675": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column H))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r676": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Column I))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r677": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Footnote 2))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024" }, "r678": { "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" }, "r679": { "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" }, "r68": { "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" }, "r680": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b" }, "r681": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "d1-1" }, "r682": { "Name": "Form 10-Q", "Number": "240", "Publisher": "SEC", "Section": "308", "Subsection": "a" }, "r683": { "Name": "Forms 10-K, 10-Q, 20-F", "Number": "240", "Publisher": "SEC", "Section": "13", "Subsection": "a-1" }, "r684": { "Name": "Regulation 12B", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r685": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1402" }, "r686": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(b)", "Publisher": "SEC", "Section": "1402", "Subparagraph": "(1)" }, "r687": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(b)", "Publisher": "SEC", "Section": "1402", "Subparagraph": "(2)" }, "r688": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(b)", "Publisher": "SEC", "Section": "1402", "Subparagraph": "(3)" }, "r689": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(c)", "Publisher": "SEC", "Section": "1402", "Subparagraph": "(2)(i)" }, "r69": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585" }, "r690": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(c)", "Publisher": "SEC", "Section": "1402", "Subparagraph": "(2)(ii)" }, "r691": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(c)", "Publisher": "SEC", "Section": "1402", "Subparagraph": "(2)(iii)" }, "r692": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(b)", "Publisher": "SEC", "Section": "1403" }, "r693": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1404" }, "r694": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(b)", "Publisher": "SEC", "Section": "1404" }, "r695": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1405", "Subparagraph": "(1)" }, "r696": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1405", "Subparagraph": "(2)" }, "r697": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1405", "Subparagraph": "(3)" }, "r698": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1405", "Subparagraph": "(4)" }, "r699": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(c)", "Publisher": "SEC", "Section": "1405" }, "r7": { "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" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585" }, "r700": { "Name": "Regulation S-T", "Number": "232", "Publisher": "SEC", "Section": "405" }, "r701": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)(3)(iii)(03)", "Topic": "848" }, "r71": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585" }, "r72": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585" }, "r73": { "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" }, "r74": { "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" }, "r75": { "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" }, "r76": { "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" }, "r77": { "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" }, "r78": { "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" }, "r79": { "Name": "Accounting Standards Codification", "Paragraph": "26", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3574-108585" }, "r8": { "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" }, "r80": { "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" }, "r81": { "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" }, "r82": { "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" }, "r83": { "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" }, "r84": { "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" }, "r85": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3098-108585" }, "r86": { "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" }, "r87": { "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" }, "r88": { "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" }, "r89": { "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" }, "r9": { "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" }, "r90": { "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" }, "r91": { "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" }, "r92": { "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" }, "r93": { "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" }, "r94": { "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" }, "r95": { "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" }, "r96": { "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" }, "r97": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(m)(1)(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690" }, "r98": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(m)(1)(ii)(A)(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690" }, "r99": { "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" } }, "version": "2.1" }