{
 "version": "2.2",
 "instance": {
  "sigi-20240630.htm": {
   "nsprefix": "sigi",
   "nsuri": "http://www.selective.com/20240630",
   "dts": {
    "inline": {
     "local": [
      "sigi-20240630.htm"
     ]
    },
    "schema": {
     "local": [
      "sigi-20240630.xsd"
     ],
     "remote": [
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd",
      "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd",
      "https://www.xbrl.org/dtr/type/2022-03-31/types.xsd",
      "https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd",
      "https://xbrl.fasb.org/srt/2023/elts/srt-roles-2023.xsd",
      "https://xbrl.fasb.org/srt/2023/elts/srt-types-2023.xsd",
      "https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd",
      "https://xbrl.fasb.org/us-gaap/2023/elts/us-roles-2023.xsd",
      "https://xbrl.fasb.org/us-gaap/2023/elts/us-types-2023.xsd",
      "https://xbrl.sec.gov/country/2023/country-2023.xsd",
      "https://xbrl.sec.gov/dei/2023/dei-2023.xsd",
      "https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd"
     ]
    },
    "calculationLink": {
     "local": [
      "sigi-20240630_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "sigi-20240630_def.xml"
     ]
    },
    "labelLink": {
     "local": [
      "sigi-20240630_lab.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "sigi-20240630_pre.xml"
     ]
    }
   },
   "keyStandard": 318,
   "keyCustom": 42,
   "axisStandard": 23,
   "axisCustom": 2,
   "memberStandard": 56,
   "memberCustom": 32,
   "hidden": {
    "total": 5,
    "http://xbrl.sec.gov/dei/2023": 5
   },
   "contextCount": 582,
   "entityCount": 1,
   "segmentCount": 98,
   "elementCount": 689,
   "unitCount": 6,
   "baseTaxonomies": {
    "http://fasb.org/us-gaap/2023": 1851,
    "http://xbrl.sec.gov/dei/2023": 32,
    "http://xbrl.sec.gov/ecd/2023": 4
   },
   "report": {
    "R1": {
     "role": "http://www.selective.com/role/CoverPage",
     "longName": "0000001 - Document - Cover Page",
     "shortName": "Cover Page",
     "isDefault": "true",
     "groupType": "document",
     "subGroupType": "",
     "menuCat": "Cover",
     "order": "1",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "dei:DocumentType",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "dei:DocumentType",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R2": {
     "role": "http://www.selective.com/role/ConsolidatedBalanceSheets",
     "longName": "0000002 - Statement - Consolidated Balance Sheets",
     "shortName": "Consolidated Balance Sheets",
     "isDefault": "false",
     "groupType": "statement",
     "subGroupType": "",
     "menuCat": "Statements",
     "order": "2",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:HeldToMaturitySecurities",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:HeldToMaturitySecurities",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R3": {
     "role": "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals",
     "longName": "0000003 - Statement - Consolidated Balance Sheets (Parentheticals)",
     "shortName": "Consolidated Balance Sheets (Parentheticals)",
     "isDefault": "false",
     "groupType": "statement",
     "subGroupType": "parenthetical",
     "menuCat": "Statements",
     "order": "3",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:HeldToMaturitySecuritiesFairValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:EquitySecuritiesFvNiCost",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R4": {
     "role": "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome",
     "longName": "0000004 - Statement - Unaudited Consolidated Statements of Income",
     "shortName": "Unaudited Consolidated Statements of Income",
     "isDefault": "false",
     "groupType": "statement",
     "subGroupType": "",
     "menuCat": "Statements",
     "order": "4",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:PremiumsEarnedNetPropertyAndCasualty",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:EffectsOfReinsuranceTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R5": {
     "role": "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss",
     "longName": "0000005 - Statement - Unaudited Consolidated Statements of Comprehensive Income (Loss)",
     "shortName": "Unaudited Consolidated Statements of Comprehensive Income (Loss)",
     "isDefault": "false",
     "groupType": "statement",
     "subGroupType": "",
     "menuCat": "Statements",
     "order": "5",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:NetIncomeLoss",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": null
    },
    "R6": {
     "role": "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity",
     "longName": "0000006 - Statement - Unaudited Consolidated Statements of Stockholders' Equity",
     "shortName": "Unaudited Consolidated Statements of Stockholders' Equity",
     "isDefault": "false",
     "groupType": "statement",
     "subGroupType": "",
     "menuCat": "Statements",
     "order": "6",
     "firstAnchor": {
      "contextRef": "c-13",
      "name": "us-gaap:StockholdersEquity",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-13",
      "name": "us-gaap:StockholdersEquity",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R7": {
     "role": "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows",
     "longName": "0000007 - Statement - Unaudited Consolidated Statements of Cash Flows",
     "shortName": "Unaudited Consolidated Statements of Cash Flows",
     "isDefault": "false",
     "groupType": "statement",
     "subGroupType": "",
     "menuCat": "Statements",
     "order": "7",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:NetIncomeLoss",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:DepreciationAmortizationAndAccretionNet",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R8": {
     "role": "http://www.selective.com/role/BasisofPresentation",
     "longName": "0000008 - Disclosure - Basis of Presentation",
     "shortName": "Basis of Presentation",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "8",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R9": {
     "role": "http://www.selective.com/role/AdoptionofAccountingPronouncements",
     "longName": "0000009 - Disclosure - Adoption of Accounting Pronouncements",
     "shortName": "Adoption of Accounting Pronouncements",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "9",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R10": {
     "role": "http://www.selective.com/role/StatementsofCashFlows",
     "longName": "0000010 - Disclosure - Statements of Cash Flows",
     "shortName": "Statements of Cash Flows",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "10",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:CashFlowSupplementalDisclosuresTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:CashFlowSupplementalDisclosuresTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R11": {
     "role": "http://www.selective.com/role/Investments",
     "longName": "0000011 - Disclosure - Investments",
     "shortName": "Investments",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "11",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:InvestmentTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:InvestmentTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R12": {
     "role": "http://www.selective.com/role/FairValueMeasurements",
     "longName": "0000012 - Disclosure - Fair Value Measurements",
     "shortName": "Fair Value Measurements",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "12",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R13": {
     "role": "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivable",
     "longName": "0000013 - Disclosure - Allowance for Credit Losses on Premiums Receivable",
     "shortName": "Allowance for Credit Losses on Premiums Receivable",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "13",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "sigi:AllowanceForUncollectiblePremiumsReceivableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "sigi:AllowanceForUncollectiblePremiumsReceivableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R14": {
     "role": "http://www.selective.com/role/Reinsurance",
     "longName": "0000014 - Disclosure - Reinsurance",
     "shortName": "Reinsurance",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "14",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ReinsuranceTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ReinsuranceTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R15": {
     "role": "http://www.selective.com/role/ReserveforLossandLossExpense",
     "longName": "0000015 - Disclosure - Reserve for Loss and Loss Expense",
     "shortName": "Reserve for Loss and Loss Expense",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "15",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R16": {
     "role": "http://www.selective.com/role/SegmentInformation",
     "longName": "0000016 - Disclosure - Segment Information",
     "shortName": "Segment Information",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "16",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R17": {
     "role": "http://www.selective.com/role/RetirementPlans",
     "longName": "0000017 - Disclosure - Retirement Plans",
     "shortName": "Retirement Plans",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "17",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R18": {
     "role": "http://www.selective.com/role/ComprehensiveIncomeLoss",
     "longName": "0000018 - Disclosure - Comprehensive Income (Loss)",
     "shortName": "Comprehensive Income (Loss)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "18",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ComprehensiveIncomeNoteTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ComprehensiveIncomeNoteTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R19": {
     "role": "http://www.selective.com/role/EarningsperCommonShare",
     "longName": "0000019 - Disclosure - Earnings per Common Share",
     "shortName": "Earnings per Common Share",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "19",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R20": {
     "role": "http://www.selective.com/role/Litigation",
     "longName": "0000020 - Disclosure - Litigation",
     "shortName": "Litigation",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "20",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:LegalMattersAndContingenciesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:LegalMattersAndContingenciesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R21": {
     "role": "http://xbrl.sec.gov/ecd/role/PvpDisclosure",
     "longName": "995410 - Disclosure - Pay vs Performance Disclosure",
     "shortName": "Pay vs Performance Disclosure",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "21",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:NetIncomeLoss",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": null
    },
    "R22": {
     "role": "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements",
     "longName": "995445 - Disclosure - Insider Trading Arrangements",
     "shortName": "Insider Trading Arrangements",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "",
     "menuCat": "Notes",
     "order": "22",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "ecd:Rule10b51ArrAdoptedFlag",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ecd:NonRule10b51ArrAdoptedFlag",
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "ecd:Rule10b51ArrAdoptedFlag",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ecd:NonRule10b51ArrAdoptedFlag",
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R23": {
     "role": "http://www.selective.com/role/StatementsofCashFlowsTables",
     "longName": "9954471 - Disclosure - Statements of Cash Flows (Tables)",
     "shortName": "Statements of Cash Flows (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "23",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R24": {
     "role": "http://www.selective.com/role/InvestmentsTables",
     "longName": "9954472 - Disclosure - Investments (Tables)",
     "shortName": "Investments (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "24",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R25": {
     "role": "http://www.selective.com/role/FairValueMeasurementsTables",
     "longName": "9954473 - Disclosure - Fair Value Measurements (Tables)",
     "shortName": "Fair Value Measurements (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "25",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R26": {
     "role": "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableTables",
     "longName": "9954474 - Disclosure - Allowance for Credit Losses on Premiums Receivable (Tables)",
     "shortName": "Allowance for Credit Losses on Premiums Receivable (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "26",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R27": {
     "role": "http://www.selective.com/role/ReinsuranceTables",
     "longName": "9954475 - Disclosure - Reinsurance (Tables)",
     "shortName": "Reinsurance (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "27",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ReinsuranceRecoverableCreditQualityIndicatorTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ReinsuranceRecoverableCreditQualityIndicatorTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R28": {
     "role": "http://www.selective.com/role/ReserveforLossandLossExpenseTables",
     "longName": "9954476 - Disclosure - Reserve for Loss and Loss Expense (Tables)",
     "shortName": "Reserve for Loss and Loss Expense (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "28",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R29": {
     "role": "http://www.selective.com/role/SegmentInformationTables",
     "longName": "9954477 - Disclosure - Segment Information (Tables)",
     "shortName": "Segment Information (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "29",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R30": {
     "role": "http://www.selective.com/role/RetirementPlansTable",
     "longName": "9954478 - Disclosure - Retirement Plans (Table)",
     "shortName": "Retirement Plans (Table)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "30",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R31": {
     "role": "http://www.selective.com/role/ComprehensiveIncomeLossTables",
     "longName": "9954479 - Disclosure - Comprehensive Income (Loss) (Tables)",
     "shortName": "Comprehensive Income (Loss) (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "31",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfComprehensiveIncomeLossTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfComprehensiveIncomeLossTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R32": {
     "role": "http://www.selective.com/role/EarningsperCommonShareTables",
     "longName": "9954480 - Disclosure - Earnings per Common Share (Tables)",
     "shortName": "Earnings per Common Share (Tables)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "tables",
     "menuCat": "Tables",
     "order": "32",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R33": {
     "role": "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails",
     "longName": "9954481 - Disclosure - Statements of Cash Flows - Schedule of Cash Flow Supplemental Disclosures (Details)",
     "shortName": "Statements of Cash Flows - Schedule of Cash Flow Supplemental Disclosures (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "33",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:InterestPaidNet",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:InterestPaidNet",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R34": {
     "role": "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails",
     "longName": "9954482 - Disclosure - Statements of Cash Flows - Schedule of Cash and Restricted Cash (Details)",
     "shortName": "Statements of Cash Flows - Schedule of Cash and Restricted Cash (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "34",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:Cash",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": null
    },
    "R35": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
     "longName": "9954483 - Disclosure - Investments - Schedule of Available-For-Sale Securities Disclosure (Details)",
     "shortName": "Investments - Schedule of Available-For-Sale Securities Disclosure (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "35",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R36": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
     "longName": "9954484 - Disclosure - Investments - Schedule of Available-for-Sale Allowance for Credit Losses Roll Forward (Details)",
     "shortName": "Investments - Schedule of Available-for-Sale Allowance for Credit Losses Roll Forward (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "36",
     "firstAnchor": {
      "contextRef": "c-71",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R37": {
     "role": "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails",
     "longName": "9954485 - Disclosure - Investments - Accrued Investment Income - Narrative (Details)",
     "shortName": "Investments - Accrued Investment Income - Narrative (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "37",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AccruedInvestmentIncomeReceivable",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-140",
      "name": "us-gaap:AccruedInvestmentIncomeReceivable",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-5",
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R38": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
     "longName": "9954486 - Disclosure - Investments - Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities By Length of Time (Details)",
     "shortName": "Investments - Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities By Length of Time (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "38",
     "firstAnchor": {
      "contextRef": "c-78",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-78",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R39": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails",
     "longName": "9954487 - Disclosure - Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details)",
     "shortName": "Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "39",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R40": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails",
     "longName": "9954488 - Disclosure - Investments - Schedule of Alternative Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy (Details)",
     "shortName": "Investments - Schedule of Alternative Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "40",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AlternativeInvestment",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-144",
      "name": "us-gaap:AlternativeInvestment",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R41": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails",
     "longName": "9954489 - Disclosure - Investments - Schedule of Aggregated Income Statement Summarized Financial Information for Partnerships in our Alternative Investment Portfolio (Details)",
     "shortName": "Investments - Schedule of Aggregated Income Statement Summarized Financial Information for Partnerships in our Alternative Investment Portfolio (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "41",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:NetInvestmentIncome",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-152",
      "name": "sigi:NetInvestmentIncomeOfEquityMethodInvestees",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-5",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "sigi:ScheduleOfAggregatedSummarizedIncomeStatementFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R42": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails",
     "longName": "9954490 - Disclosure - Investments -Schedule of Investments Pledged as Collateral (Details)",
     "shortName": "Investments -Schedule of Investments Pledged as Collateral (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "42",
     "firstAnchor": {
      "contextRef": "c-78",
      "name": "us-gaap:AssetsHeldByInsuranceRegulators",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-5",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-78",
      "name": "us-gaap:AssetsHeldByInsuranceRegulators",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-5",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R43": {
     "role": "http://www.selective.com/role/InvestmentsCreditConcentrationRiskDetails",
     "longName": "9954491 - Disclosure - Investments - Credit Concentration Risk (Details)",
     "shortName": "Investments - Credit Concentration Risk (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "43",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "sigi:MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies",
      "unitRef": "number",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "2",
      "ancestors": [
       "sigi:MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "sigi:MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies",
      "unitRef": "number",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "2",
      "ancestors": [
       "sigi:MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R44": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails",
     "longName": "9954492 - Disclosure - Investments -Schedule of Net Investment Income (Details)",
     "shortName": "Investments -Schedule of Net Investment Income (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "44",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:NetInvestmentIncome",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-170",
      "name": "us-gaap:NetInvestmentIncome",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R45": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails",
     "longName": "9954493 - Disclosure - Investments - Schedule of Net Realized and Unrealized Investment Gains and (Losses) (Details)",
     "shortName": "Investments - Schedule of Net Realized and Unrealized Investment Gains and (Losses) (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "45",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "sigi:DebtAndEquitySecuritiesRealizedGains",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "sigi:DebtAndEquitySecuritiesRealizedGains",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R46": {
     "role": "http://www.selective.com/role/InvestmentsScheduleofRealizedandUnrealizedGainsLossesonEquitySecuritiesDetails",
     "longName": "9954494 - Disclosure - Investments - Schedule of Realized and Unrealized Gains (Losses) on Equity Securities (Details)",
     "shortName": "Investments - Schedule of Realized and Unrealized Gains (Losses) on Equity Securities (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "46",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:UnrealizedGainLossOnInvestments",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "sigi:UnrealizedGainLossOnSecuritiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:UnrealizedGainLossOnInvestments",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "sigi:UnrealizedGainLossOnSecuritiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R47": {
     "role": "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
     "longName": "9954495 - Disclosure - Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Financial Liabilities (Details)",
     "shortName": "Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Financial Liabilities (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "47",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:LongTermDebtAndCapitalLeaseObligations",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:LongTermDebtAndCapitalLeaseObligations",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R48": {
     "role": "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
     "longName": "9954496 - Disclosure - Fair Value Measurements - Quantitative Disclosures of Fair Value Assets (Details)",
     "shortName": "Fair Value Measurements - Quantitative Disclosures of Fair Value Assets (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "48",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-246",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R49": {
     "role": "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
     "longName": "9954497 - Disclosure - Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details)",
     "shortName": "Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "49",
     "firstAnchor": {
      "contextRef": "c-6",
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-301",
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R50": {
     "role": "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails",
     "longName": "9954498 - Disclosure - Fair Value Measurements - Schedule of Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details)",
     "shortName": "Fair Value Measurements - Schedule of Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "50",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:OtherAssetsFairValueDisclosure",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:OtherAssetsFairValueDisclosure",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R51": {
     "role": "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails",
     "longName": "9954499 - Disclosure - Fair Value Measurements - Schedule of Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value (Details)",
     "shortName": "Fair Value Measurements - Schedule of Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "51",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:HeldToMaturitySecuritiesFairValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-81",
      "name": "us-gaap:HeldToMaturitySecuritiesFairValue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R52": {
     "role": "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableDetails",
     "longName": "9954500 - Disclosure - Allowance for Credit Losses on Premiums Receivable (Details)",
     "shortName": "Allowance for Credit Losses on Premiums Receivable (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "52",
     "firstAnchor": {
      "contextRef": "c-71",
      "name": "us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-71",
      "name": "us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R53": {
     "role": "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails",
     "longName": "9954501 - Disclosure - Reinsurance - Schedule of Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details)",
     "shortName": "Reinsurance - Schedule of Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "53",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "us-gaap:ReinsuranceRecoverablesOnUnpaidLossesGross",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-429",
      "name": "us-gaap:ReinsuranceRecoverablesGross",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R54": {
     "role": "http://www.selective.com/role/ReinsuranceScheduleofAllowanceforCreditLossesonReinsuranceRecoverableDetails",
     "longName": "9954502 - Disclosure - Reinsurance - Schedule of Allowance for Credit Losses on Reinsurance Recoverable (Details)",
     "shortName": "Reinsurance - Schedule of Allowance for Credit Losses on Reinsurance Recoverable (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "54",
     "firstAnchor": {
      "contextRef": "c-71",
      "name": "us-gaap:ReinsuranceRecoverablesAllowance",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R55": {
     "role": "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails",
     "longName": "9954503 - Disclosure - Reinsurance - Schedule of Direct, Assumed, and Ceded Reinsurance Amounts (Details)",
     "shortName": "Reinsurance - Schedule of Direct, Assumed, and Ceded Reinsurance Amounts (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "55",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:DirectPremiumsWritten",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:EffectsOfReinsuranceTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:DirectPremiumsWritten",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:EffectsOfReinsuranceTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R56": {
     "role": "http://www.selective.com/role/ReinsuranceNarrativeDetails",
     "longName": "9954504 - Disclosure - Reinsurance - Narrative (Details)",
     "shortName": "Reinsurance - Narrative (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "56",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": null
    },
    "R57": {
     "role": "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails",
     "longName": "9954505 - Disclosure - Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details)",
     "shortName": "Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "57",
     "firstAnchor": {
      "contextRef": "c-6",
      "name": "us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-6",
      "name": "us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R58": {
     "role": "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
     "longName": "9954506 - Disclosure - Reserve for Loss and Loss Expense - Narrative (Details)",
     "shortName": "Reserve for Loss and Loss Expense - Narrative (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "58",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-464",
      "name": "us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-5",
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R59": {
     "role": "http://www.selective.com/role/SegmentInformationNarrativeDetails",
     "longName": "9954507 - Disclosure - Segment Information - Narrative (Details)",
     "shortName": "Segment Information - Narrative (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "59",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:NumberOfReportableSegments",
      "unitRef": "segment",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "INF",
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "us-gaap:NumberOfReportableSegments",
      "unitRef": "segment",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "INF",
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R60": {
     "role": "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails",
     "longName": "9954508 - Disclosure - Segment Information - Schedule of Revenue by Segment (Details)",
     "shortName": "Segment Information - Schedule of Revenue by Segment (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "60",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:PremiumsEarnedNetPropertyAndCasualty",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:EffectsOfReinsuranceTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-503",
      "name": "us-gaap:Revenues",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R61": {
     "role": "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
     "longName": "9954509 - Disclosure - Segment Information - Schedule of Income (Loss) Before and After Federal Income Tax (Details)",
     "shortName": "Segment Information - Schedule of Income (Loss) Before and After Federal Income Tax (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "61",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:NetInvestmentIncome",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "sigi:TaxOnInvestmentIncome",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R62": {
     "role": "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
     "longName": "9954510 - Disclosure - Segment Information - Schedule of Reconciliation of Segment Results to Income (Loss) Before Federal Income Tax (Details)",
     "shortName": "Segment Information - Schedule of Reconciliation of Segment Results to Income (Loss) Before Federal Income Tax (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "62",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "sigi:TotalInvestmentsRevenue",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:OtherGeneralExpense",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R63": {
     "role": "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails",
     "longName": "9954511 - Disclosure - Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details)",
     "shortName": "Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "63",
     "firstAnchor": {
      "contextRef": "c-551",
      "name": "us-gaap:DefinedBenefitPlanInterestCost",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-551",
      "name": "us-gaap:DefinedBenefitPlanInterestCost",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R64": {
     "role": "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails",
     "longName": "9954512 - Disclosure - Retirement Plans - Schedule of Weighted-Average Expense Assumptions (Details)",
     "shortName": "Retirement Plans - Schedule of Weighted-Average Expense Assumptions (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "64",
     "firstAnchor": {
      "contextRef": "c-553",
      "name": "us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate",
      "unitRef": "number",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "4",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfAssumptionsUsedTableTextBlock",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-553",
      "name": "us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate",
      "unitRef": "number",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "4",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfAssumptionsUsedTableTextBlock",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    },
    "R65": {
     "role": "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
     "longName": "9954513 - Disclosure - Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details)",
     "shortName": "Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "65",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfComprehensiveIncomeLossTableTextBlock",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R66": {
     "role": "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
     "longName": "9954514 - Disclosure - Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details)",
     "shortName": "Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "66",
     "firstAnchor": {
      "contextRef": "c-6",
      "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-556",
      "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R67": {
     "role": "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
     "longName": "9954515 - Disclosure - Comprehensive Income (Loss) - Schedule of Reclassification out of AOCI (Details)",
     "shortName": "Comprehensive Income (Loss) - Schedule of Reclassification out of AOCI (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "67",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:GainLossOnInvestments",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-579",
      "name": "us-gaap:NetIncomeLoss",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R68": {
     "role": "http://www.selective.com/role/EarningsperCommonShareDetails",
     "longName": "9954516 - Disclosure - Earnings per Common Share (Details)",
     "shortName": "Earnings per Common Share (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "68",
     "firstAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic",
      "unitRef": "usd",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true
     },
     "uniqueAnchor": {
      "contextRef": "c-7",
      "name": "us-gaap:WeightedAverageNumberOfSharesOutstandingBasic",
      "unitRef": "shares",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "-3",
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "unique": true
     }
    },
    "R69": {
     "role": "http://www.selective.com/role/LitigationDetails",
     "longName": "9954517 - Disclosure - Litigation (Details)",
     "shortName": "Litigation (Details)",
     "isDefault": "false",
     "groupType": "disclosure",
     "subGroupType": "details",
     "menuCat": "Details",
     "order": "69",
     "firstAnchor": {
      "contextRef": "c-5",
      "name": "sigi:NumberOfInsuranceSubsidiaries",
      "unitRef": "subsidiary",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "INF",
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-5",
      "name": "sigi:NumberOfInsuranceSubsidiaries",
      "unitRef": "subsidiary",
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": "INF",
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "sigi-20240630.htm",
      "first": true,
      "unique": true
     }
    }
   },
   "tag": {
    "srt_AMBestAMinusRatingMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "AMBestAMinusRatingMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "A-",
        "label": "AM Best, A- Rating [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "srt_AMBestAPlusPlusRatingMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "AMBestAPlusPlusRatingMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "A++",
        "label": "AM Best, A++ Rating [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "srt_AMBestAPlusRatingMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "AMBestAPlusRatingMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "A+",
        "label": "AM Best, A+ Rating [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "srt_AMBestARatingMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "AMBestARatingMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "A",
        "label": "AM Best, A Rating [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_AMBestRatedReinsurerMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "AMBestRatedReinsurerMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total rated reinsurers",
        "label": "AM Best Rated Reinsurer [Member]",
        "documentation": "Total of all rated reinsurer's by credit quality with ratings by AM Best."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AOCIAttributableToParentNetOfTaxRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AOCIAttributableToParentNetOfTaxRollForward",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "AOCI Attributable to Parent, Net of Tax [Roll Forward]",
        "label": "AOCI Attributable to Parent, Net of Tax [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccountingPoliciesAbstract",
     "lang": {
      "en-us": {
       "role": {
        "label": "Accounting Policies [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AccruedIncomeTaxes": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccruedIncomeTaxes",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current federal income tax",
        "label": "Accrued Income Taxes",
        "documentation": "Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes."
       }
      }
     },
     "auth_ref": [
      "r81",
      "r82",
      "r111",
      "r117",
      "r628"
     ]
    },
    "sigi_AccruedInvestmentIncomeLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "AccruedInvestmentIncomeLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accrued Investment Income [Line Items]",
        "label": "Accrued Investment Income [Line Items]",
        "documentation": "Accrued Investment Income"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AccruedInvestmentIncomeReceivable": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccruedInvestmentIncomeReceivable",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accrued investment income",
        "label": "Accrued Investment Income Receivable",
        "documentation": "Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments."
       }
      }
     },
     "auth_ref": [
      "r115",
      "r637",
      "r957"
     ]
    },
    "sigi_AccruedInvestmentIncomeTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "AccruedInvestmentIncomeTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accrued Investment Income [Table]",
        "label": "Accrued Investment Income [Table]",
        "documentation": "Accrued Investment Income"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Defined benefit pension and post-retirement life plans",
        "label": "Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]",
        "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans attributable to the parent."
       }
      }
     },
     "auth_ref": [
      "r3",
      "r16",
      "r35",
      "r959",
      "r960",
      "r961"
     ]
    },
    "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Property and equipment, accumulated depreciation and amortization",
        "label": "Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment",
        "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services."
       }
      }
     },
     "auth_ref": [
      "r55",
      "r166",
      "r640"
     ]
    },
    "us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedNetUnrealizedInvestmentGainLossMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Credit Loss Related",
        "label": "AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]",
        "documentation": "Accumulated 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), attributable to parent."
       }
      }
     },
     "auth_ref": [
      "r176",
      "r177",
      "r178",
      "r181",
      "r189",
      "r190",
      "r959"
     ]
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Line Items]",
        "label": "Accumulated Other Comprehensive Income (Loss) [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r188",
      "r189",
      "r549",
      "r551",
      "r552",
      "r553",
      "r554",
      "r555"
     ]
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accumulated other comprehensive income (loss) (Note 11)",
        "periodStartLabel": "Balance, December\u00a031, 2023",
        "periodEndLabel": "Balance, June 30, 2024",
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax",
        "documentation": "Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source."
       }
      }
     },
     "auth_ref": [
      "r34",
      "r35",
      "r92",
      "r175",
      "r634",
      "r685",
      "r688"
     ]
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedOtherComprehensiveIncomeLossTable",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Table]",
        "label": "Accumulated Other Comprehensive Income (Loss) [Table]",
        "documentation": "Disclosure of information about components of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r188",
      "r189",
      "r549",
      "r551",
      "r552",
      "r553",
      "r554",
      "r555"
     ]
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Accumulated other comprehensive income (loss):",
        "terseLabel": "Total AOCI",
        "label": "AOCI Attributable to Parent [Member]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r2",
      "r16",
      "r35",
      "r515",
      "r518",
      "r565",
      "r680",
      "r681",
      "r959",
      "r960",
      "r961",
      "r972",
      "r973",
      "r974"
     ]
    },
    "ecd_Additional402vDisclosureTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "Additional402vDisclosureTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Additional 402(v) Disclosure",
        "label": "Additional 402(v) Disclosure [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r899"
     ]
    },
    "us-gaap_AdditionalPaidInCapitalCommonStock": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AdditionalPaidInCapitalCommonStock",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Additional paid-in capital",
        "label": "Additional Paid in Capital, Common Stock",
        "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."
       }
      }
     },
     "auth_ref": [
      "r85"
     ]
    },
    "us-gaap_AdditionalPaidInCapitalMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AdditionalPaidInCapitalMember",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Additional paid-in capital:",
        "label": "Additional Paid-in Capital [Member]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r493",
      "r494",
      "r495",
      "r706",
      "r972",
      "r973",
      "r974",
      "r1021",
      "r1062"
     ]
    },
    "ecd_AdjToCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AdjToCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adjustment to Compensation, Amount",
        "label": "Adjustment to Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "ecd_AdjToCompAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AdjToCompAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adjustment to Compensation:",
        "label": "Adjustment to Compensation [Axis]"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "ecd_AdjToNonPeoNeoCompFnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AdjToNonPeoNeoCompFnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adjustment to Non-PEO NEO Compensation Footnote",
        "label": "Adjustment to Non-PEO NEO Compensation Footnote [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "ecd_AdjToPeoCompFnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AdjToPeoCompFnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adjustment To PEO Compensation, Footnote",
        "label": "Adjustment To PEO Compensation, Footnote [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Acquisition of treasury stock - shares acquired related to employee share-based compensation plans",
        "label": "Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation",
        "documentation": "Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:",
        "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "ecd_AggtErrCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AggtErrCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Aggregate Erroneous Compensation Amount",
        "label": "Aggregate Erroneous Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r870",
      "r881",
      "r891",
      "r916"
     ]
    },
    "ecd_AggtErrCompNotYetDeterminedTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AggtErrCompNotYetDeterminedTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Aggregate Erroneous Compensation Not Yet Determined",
        "label": "Aggregate Erroneous Compensation Not Yet Determined [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r873",
      "r884",
      "r894",
      "r919"
     ]
    },
    "ecd_AllAdjToCompMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AllAdjToCompMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "All Adjustments to Compensation",
        "label": "All Adjustments to Compensation [Member]"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "ecd_AllExecutiveCategoriesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AllExecutiveCategoriesMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "All Executive Categories",
        "label": "All Executive Categories [Member]"
       }
      }
     },
     "auth_ref": [
      "r912"
     ]
    },
    "ecd_AllIndividualsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AllIndividualsMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure",
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure",
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements",
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "All Individuals",
        "label": "All Individuals [Member]"
       }
      }
     },
     "auth_ref": [
      "r877",
      "r885",
      "r895",
      "r912",
      "r920",
      "r924",
      "r932"
     ]
    },
    "ecd_AllTradingArrangementsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AllTradingArrangementsMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "All Trading Arrangements",
        "label": "All Trading Arrangements [Member]"
       }
      }
     },
     "auth_ref": [
      "r930"
     ]
    },
    "us-gaap_AllowanceForLoanAndLeaseLossesRealEstate": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AllowanceForLoanAndLeaseLossesRealEstate",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Less: allowance for credit losses",
        "label": "Allowance for Loan and Lease Losses, Real Estate",
        "documentation": "The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_AllowanceForUncollectiblePremiumsReceivableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "AllowanceForUncollectiblePremiumsReceivableTextBlock",
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivable"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Allowance for Credit Losses on Premiums Receivable",
        "label": "Allowance for Uncollectible Premiums Receivable [Text Block]",
        "documentation": "The entire disclosure for allowance for credit losses on Premiums Receivable."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AlternativeInvestment": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AlternativeInvestment",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Alternative investments",
        "verboseLabel": "Carrying Value",
        "label": "Alternative Investment",
        "documentation": "Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund."
       }
      }
     },
     "auth_ref": [
      "r529",
      "r542"
     ]
    },
    "dei_AmendmentFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "AmendmentFlag",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amendment Flag",
        "label": "Amendment Flag",
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Antidilutive securities excluded from computation of earnings per share, amount",
        "label": "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
        "documentation": "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented."
       }
      }
     },
     "auth_ref": [
      "r241"
     ]
    },
    "us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Credit loss related",
        "label": "AOCI, Gain (Loss), Debt Securities, Available-for-Sale, with Allowance for Credit Loss, Parent [Member]",
        "documentation": "Accumulated 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), with allowance for credit loss, attributable to parent."
       }
      }
     },
     "auth_ref": [
      "r336"
     ]
    },
    "us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net realized (gains) losses on disposals and intent-to-sell AFS securities",
        "label": "AOCI, Gain (Loss), Debt Securities, Available-for-Sale, without Allowance for Credit Loss, Parent [Member]",
        "documentation": "Accumulated 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), without allowance for credit loss, attributable to parent."
       }
      }
     },
     "auth_ref": [
      "r336"
     ]
    },
    "us-gaap_AssetBackedSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AssetBackedSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Collateralized loan obligations (\"CLO\") and other asset-backed securities (\"ABS\")",
        "verboseLabel": "CLO and other ABS",
        "label": "Asset-Backed Securities [Member]",
        "documentation": "Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans."
       }
      }
     },
     "auth_ref": [
      "r828",
      "r986",
      "r988",
      "r989"
     ]
    },
    "us-gaap_Assets": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "Assets",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total assets",
        "label": "Assets",
        "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."
       }
      }
     },
     "auth_ref": [
      "r116",
      "r169",
      "r207",
      "r252",
      "r267",
      "r273",
      "r318",
      "r370",
      "r371",
      "r372",
      "r373",
      "r374",
      "r375",
      "r376",
      "r377",
      "r378",
      "r508",
      "r512",
      "r545",
      "r627",
      "r748",
      "r842",
      "r861",
      "r1010",
      "r1011",
      "r1026"
     ]
    },
    "us-gaap_AssetsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AssetsAbstract",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "ASSETS",
        "label": "Assets [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AssetsFairValueDisclosure": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AssetsFairValueDisclosure",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total assets measured at fair value",
        "terseLabel": "Total assets measured at fair value",
        "label": "Assets, Fair Value Disclosure",
        "documentation": "Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events."
       }
      }
     },
     "auth_ref": [
      "r68"
     ]
    },
    "us-gaap_AssetsHeldByInsuranceRegulators": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AssetsHeldByInsuranceRegulators",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Securities pledged as collateral on deposit with various state and regulatory agencies",
        "label": "Assets Held by Insurance Regulators",
        "documentation": "Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements."
       }
      }
     },
     "auth_ref": [
      "r696"
     ]
    },
    "us-gaap_AssumedPremiumsEarned": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AssumedPremiumsEarned",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_PremiumsEarnedNetPropertyAndCasualty",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Assumed",
        "label": "Assumed Premiums Earned",
        "documentation": "Amount of earned premiums assumed from other entities."
       }
      }
     },
     "auth_ref": [
      "r669",
      "r692",
      "r695",
      "r1047"
     ]
    },
    "us-gaap_AssumedPremiumsWritten": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AssumedPremiumsWritten",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Assumed",
        "label": "Assumed Premiums Written",
        "documentation": "Amount of written premiums assumed from other entities."
       }
      }
     },
     "auth_ref": [
      "r692"
     ]
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized Gains",
        "label": "Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r287"
     ]
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Unrealized Losses",
        "label": "Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r288"
     ]
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Fixed income securities, available-for-sale, amortized cost",
        "terseLabel": "Cost/ Amortized Cost",
        "label": "Debt Securities, Available-for-Sale, Amortized Cost",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r284",
      "r335",
      "r625"
     ]
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]",
        "label": "Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r338",
      "r820"
     ]
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after five years through 10 years fair value, AFS",
        "label": "Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r293",
      "r615"
     ]
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after one year through five years fair value, AFS",
        "label": "Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r292",
      "r614"
     ]
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after 10 years fair value, AFS",
        "label": "Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r294",
      "r616"
     ]
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "AFS, Fair Value",
        "label": "Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due in one year or less fair value, AFS",
        "label": "Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r291",
      "r613"
     ]
    },
    "us-gaap_AvailableForSaleSecuritiesDebtSecurities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableForSaleSecuritiesDebtSecurities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails": {
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Fixed income securities, available-for-sale \u2013 at fair value (allowance for credit losses: $31,309 \u2013 2024 and $28,212 \u2013 2023; amortized cost: $8,080,498 \u2013 2024 and $7,880,697 \u2013 2023)",
        "terseLabel": "Fair Value",
        "totalLabel": "Total AFS fixed income securities, Fair Value",
        "netLabel": "AFS fixed income securities",
        "label": "Debt Securities, Available-for-Sale",
        "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r285",
      "r335",
      "r603",
      "r983"
     ]
    },
    "us-gaap_AvailableforsaleSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AvailableforsaleSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Available-for-Sale Securities",
        "terseLabel": "Total pledged as collateral",
        "label": "Available-for-Sale Securities [Member]",
        "documentation": "Investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r138"
     ]
    },
    "ecd_AwardExrcPrice": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardExrcPrice",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Exercise Price",
        "label": "Award Exercise Price"
       }
      }
     },
     "auth_ref": [
      "r927"
     ]
    },
    "ecd_AwardGrantDateFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardGrantDateFairValue",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value as of Grant Date",
        "label": "Award Grant Date Fair Value"
       }
      }
     },
     "auth_ref": [
      "r928"
     ]
    },
    "ecd_AwardTmgDiscLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardTmgDiscLineItems",
     "lang": {
      "en-us": {
       "role": {
        "label": "Award Timing Disclosures [Line Items]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "ecd_AwardTmgHowMnpiCnsdrdTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardTmgHowMnpiCnsdrdTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Award Timing, How MNPI Considered",
        "label": "Award Timing, How MNPI Considered [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "ecd_AwardTmgMethodTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardTmgMethodTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Award Timing Method",
        "label": "Award Timing Method [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "ecd_AwardTmgMnpiCnsdrdFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardTmgMnpiCnsdrdFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Award Timing MNPI Considered",
        "label": "Award Timing MNPI Considered [Flag]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "ecd_AwardTmgMnpiDiscTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardTmgMnpiDiscTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Award Timing MNPI Disclosure",
        "label": "Award Timing MNPI Disclosure [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "ecd_AwardTmgPredtrmndFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardTmgPredtrmndFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Award Timing Predetermined",
        "label": "Award Timing Predetermined [Flag]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "us-gaap_AwardTypeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "AwardTypeAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Award Type",
        "label": "Award Type [Axis]",
        "documentation": "Information by type of award under share-based payment arrangement."
       }
      }
     },
     "auth_ref": [
      "r467",
      "r468",
      "r469",
      "r470",
      "r471",
      "r472",
      "r473",
      "r474",
      "r475",
      "r476",
      "r477",
      "r478",
      "r479",
      "r480",
      "r481",
      "r482",
      "r483",
      "r484",
      "r485",
      "r486",
      "r487",
      "r488",
      "r489",
      "r490",
      "r491",
      "r492"
     ]
    },
    "ecd_AwardUndrlygSecuritiesAmt": {
     "xbrltype": "decimalItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardUndrlygSecuritiesAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Underlying Securities",
        "label": "Award Underlying Securities Amount"
       }
      }
     },
     "auth_ref": [
      "r926"
     ]
    },
    "ecd_AwardsCloseToMnpiDiscIndName": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardsCloseToMnpiDiscIndName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Name",
        "label": "Awards Close in Time to MNPI Disclosures, Individual Name"
       }
      }
     },
     "auth_ref": [
      "r925"
     ]
    },
    "ecd_AwardsCloseToMnpiDiscTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardsCloseToMnpiDiscTable",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Awards Close in Time to MNPI Disclosures",
        "label": "Awards Close in Time to MNPI Disclosures [Table]"
       }
      }
     },
     "auth_ref": [
      "r924"
     ]
    },
    "ecd_AwardsCloseToMnpiDiscTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "AwardsCloseToMnpiDiscTableTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Awards Close in Time to MNPI Disclosures, Table",
        "label": "Awards Close in Time to MNPI Disclosures [Table Text Block]"
       }
      }
     },
     "auth_ref": [
      "r924"
     ]
    },
    "us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
     "presentation": [
      "http://www.selective.com/role/BasisofPresentation"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Basis of Presentation",
        "label": "Basis of Presentation and Significant Accounting Policies [Text Block]",
        "documentation": "The entire disclosure for the basis of presentation and significant accounting policies concepts. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Accounting policies describe all significant accounting policies of the reporting entity."
       }
      }
     },
     "auth_ref": [
      "r106"
     ]
    },
    "us-gaap_BenefitsLossesAndExpenses": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "BenefitsLossesAndExpenses",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total expenses",
        "label": "Benefits, Losses and Expenses",
        "documentation": "The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs."
       }
      }
     },
     "auth_ref": [
      "r122"
     ]
    },
    "us-gaap_BenefitsLossesAndExpensesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "BenefitsLossesAndExpensesAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Expenses:",
        "label": "Benefits, Losses and Expenses [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_BusinessOwnersPoliciesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "BusinessOwnersPoliciesMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Businessowners' policies",
        "label": "Business Owners Policies [Member]",
        "documentation": "Represents insurance coverage provided for business owners' policies"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CarryingReportedAmountFairValueDisclosureMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CarryingReportedAmountFairValueDisclosureMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Carrying Amount",
        "label": "Reported Value Measurement [Member]",
        "documentation": "Measured as reported on the statement of financial position (balance sheet)."
       }
      }
     },
     "auth_ref": [
      "r71",
      "r72"
     ]
    },
    "us-gaap_Cash": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "Cash",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails": {
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Cash",
        "verboseLabel": "Cash",
        "label": "Cash",
        "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. Excludes cash and cash equivalents within disposal group and discontinued operation."
       }
      }
     },
     "auth_ref": [
      "r151",
      "r631",
      "r717",
      "r743",
      "r842",
      "r861",
      "r955"
     ]
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Cash and restricted cash, beginning of period",
        "periodEndLabel": "Cash and restricted cash, end of period",
        "totalLabel": "Total cash and restricted cash shown in the Consolidated Statements of Cash Flows",
        "label": "Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents",
        "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."
       }
      }
     },
     "auth_ref": [
      "r42",
      "r103",
      "r206"
     ]
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net increase (decrease) in cash and restricted cash",
        "label": "Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect",
        "documentation": "Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding 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."
       }
      }
     },
     "auth_ref": [
      "r1",
      "r103"
     ]
    },
    "us-gaap_CashFlowSupplementalDisclosuresTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CashFlowSupplementalDisclosuresTextBlock",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statements of Cash Flows",
        "label": "Cash Flow, Supplemental Disclosures [Text Block]",
        "documentation": "The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period."
       }
      }
     },
     "auth_ref": [
      "r100"
     ]
    },
    "sigi_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Cash paid for amounts included in the measurement of lease liabilities:",
        "label": "Cash Paid for Amounts Included in the Measurement of Lease Liabilities [Abstract]",
        "documentation": "Cash Paid for Amounts Included in the Measurement of Lease Liabilities"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_CashPaidReceivedDuringThePeriodAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CashPaidReceivedDuringThePeriodAbstract",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Cash paid (received) during the period for:",
        "label": "Cash Paid (Received) During the Period [Abstract]",
        "documentation": "Cash Paid (Received) During the Period"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_CasualtyInsuranceProductLineMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CasualtyInsuranceProductLineMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceNarrativeDetails",
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Casualty lines",
        "verboseLabel": "Casualty reserve",
        "label": "Casualty Insurance Product Line [Member]",
        "documentation": "Product line consisting of casualty-related insurance."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]",
        "label": "Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Table]",
        "label": "Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Table]",
        "documentation": "Description of the reasons for the change in incurred claims and claim adjustment expenses recognized in the income statement attributable to insured events of prior fiscal years. Also includes disclosures of additional premiums or return premiums accrued as a result of changes in incurred claims and claim adjustment expenses."
       }
      }
     },
     "auth_ref": [
      "r123",
      "r126"
     ]
    },
    "us-gaap_CededPremiumsEarned": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CededPremiumsEarned",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_PremiumsEarnedNetPropertyAndCasualty",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Ceded",
        "label": "Ceded Premiums Earned",
        "documentation": "Amount of earned premiums ceded to other entities."
       }
      }
     },
     "auth_ref": [
      "r668",
      "r689",
      "r690",
      "r693",
      "r695",
      "r1047"
     ]
    },
    "us-gaap_CededPremiumsWritten": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CededPremiumsWritten",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Ceded",
        "label": "Ceded Premiums Written",
        "documentation": "Amount of written premiums ceded to other entities."
       }
      }
     },
     "auth_ref": [
      "r127",
      "r128"
     ]
    },
    "ecd_ChangedPeerGroupFnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ChangedPeerGroupFnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Changed Peer Group, Footnote",
        "label": "Changed Peer Group, Footnote [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r903"
     ]
    },
    "dei_CityAreaCode": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "CityAreaCode",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "City Area Code",
        "label": "City Area Code",
        "documentation": "Area code of city"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ClassOfStockDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ClassOfStockDomain",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Class of Stock [Domain]",
        "label": "Class of Stock [Domain]",
        "documentation": "Share of stock differentiated by the voting rights the holder receives. Examples include, but are not limited to, common stock, redeemable preferred stock, nonredeemable preferred stock, and convertible stock."
       }
      }
     },
     "auth_ref": [
      "r159",
      "r171",
      "r172",
      "r173",
      "r207",
      "r231",
      "r235",
      "r238",
      "r240",
      "r246",
      "r247",
      "r318",
      "r370",
      "r372",
      "r373",
      "r374",
      "r377",
      "r378",
      "r384",
      "r385",
      "r386",
      "r387",
      "r389",
      "r545",
      "r700",
      "r701",
      "r702",
      "r703",
      "r706",
      "r707",
      "r708",
      "r709",
      "r710",
      "r711",
      "r712",
      "r713",
      "r714",
      "r715",
      "r716",
      "r718",
      "r735",
      "r757",
      "r777",
      "r803",
      "r804",
      "r805",
      "r806",
      "r807",
      "r939",
      "r969",
      "r975"
     ]
    },
    "ecd_CoSelectedMeasureAmt": {
     "xbrltype": "decimalItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "CoSelectedMeasureAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Company Selected Measure Amount",
        "label": "Company Selected Measure Amount"
       }
      }
     },
     "auth_ref": [
      "r904"
     ]
    },
    "ecd_CoSelectedMeasureName": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "CoSelectedMeasureName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Company Selected Measure Name",
        "label": "Company Selected Measure Name"
       }
      }
     },
     "auth_ref": [
      "r904"
     ]
    },
    "us-gaap_CombinedRatio": {
     "xbrltype": "percentItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CombinedRatio",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Combined ratio",
        "label": "Combined Ratio",
        "documentation": "Ratio of non-life losses and loss expenses, non-life acquisition expenses and non-life general and administrative expenses, to non-life net premiums earned."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_CommercialAutomobileMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CommercialAutomobileMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commercial automobile",
        "label": "Commercial Automobile [Member]",
        "documentation": "Represents insurance coverage provided to policy holders on commercial automobiles."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CommercialMortgageBackedSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommercialMortgageBackedSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commercial mortgage-backed securities (\"CMBS\")",
        "verboseLabel": "CMBS",
        "label": "Commercial Mortgage-Backed Securities [Member]",
        "documentation": "Securities collateralized by commercial real estate mortgage loans."
       }
      }
     },
     "auth_ref": [
      "r986",
      "r988",
      "r989",
      "r1016"
     ]
    },
    "sigi_CommercialMortgageLoansMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CommercialMortgageLoansMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commercial mortgage loans (\"CMLs\")",
        "label": "Commercial Mortgage Loans [Member]",
        "documentation": "Commercial mortgage loans are loans secured by commercial property, such as an office building, multi-family apartment complex, industrial warehouse, or shopping center. These investments may be acquired through direct originations under a loan syndication arrangement or purchased in the marketplace."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_CommercialPropertyMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CommercialPropertyMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commercial property",
        "label": "Commercial Property [Member]",
        "documentation": "Commercial property line of business within Standard Commercial Lines segment."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_Commercialmortgageloanfairvalue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "Commercialmortgageloanfairvalue",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commercial mortgage loans, fair value",
        "label": "Commercial mortgage loan, fair value",
        "documentation": "Fair value of investment in commercial loan measured at original cost."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CommitmentsAndContingencies": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommitmentsAndContingencies",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commitments and contingencies",
        "label": "Commitments and Contingencies",
        "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur."
       }
      }
     },
     "auth_ref": [
      "r31",
      "r76",
      "r630",
      "r734"
     ]
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "lang": {
      "en-us": {
       "role": {
        "label": "Commitments and Contingencies Disclosure [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CommonStockDividendsPerShareDeclared": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockDividendsPerShareDeclared",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Dividends declared per common share (in dollars per share)",
        "label": "Common Stock, Dividends, Per Share, Declared",
        "documentation": "Aggregate dividends declared during the period for each share of common stock outstanding."
       }
      }
     },
     "auth_ref": [
      "r109"
     ]
    },
    "us-gaap_CommonStockMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockMember",
     "presentation": [
      "http://www.selective.com/role/CoverPage",
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Common Stock",
        "terseLabel": "Common stock:",
        "netLabel": "Common stock",
        "label": "Common Stock [Member]",
        "documentation": "Stock that is subordinate to all other stock of the issuer."
       }
      }
     },
     "auth_ref": [
      "r847",
      "r848",
      "r849",
      "r852",
      "r853",
      "r854",
      "r855",
      "r972",
      "r973",
      "r1021",
      "r1060",
      "r1062"
     ]
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockParOrStatedValuePerShare",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Common stock, par or stated value (in dollars per share)",
        "label": "Common Stock, Par or Stated Value Per Share",
        "documentation": "Face amount or stated value per share of common stock."
       }
      }
     },
     "auth_ref": [
      "r84"
     ]
    },
    "us-gaap_CommonStockSharesAuthorized": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockSharesAuthorized",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Common stock, authorized (in shares)",
        "label": "Common Stock, Shares Authorized",
        "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws."
       }
      }
     },
     "auth_ref": [
      "r84",
      "r735"
     ]
    },
    "us-gaap_CommonStockSharesIssued": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockSharesIssued",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Common stock, issued (in shares)",
        "label": "Common Stock, Shares, Issued",
        "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."
       }
      }
     },
     "auth_ref": [
      "r84"
     ]
    },
    "us-gaap_CommonStockSharesOutstanding": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockSharesOutstanding",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Common stock, shares outstanding, beginning of period (in shares)",
        "periodEndLabel": "Common stock, shares outstanding, end of period (in shares)",
        "label": "Common Stock, Shares, Outstanding",
        "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r84",
      "r735",
      "r754",
      "r1062",
      "r1063"
     ]
    },
    "sigi_CommonStockSharesOutstandingRollForwardRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "CommonStockSharesOutstandingRollForwardRollForward",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Common stock, shares outstanding:",
        "label": "Common Stock, Shares Outstanding Roll Forward [Roll Forward]",
        "documentation": "Common Stock, Shares Outstanding Roll Forward"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CommonStockValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CommonStockValue",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Common stock of $2 par value per share: Authorized shares 360,000,000 Issued: 105,516,194 \u2013 2024; 105,223,307 \u2013 2023",
        "label": "Common Stock, Value, Issued",
        "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."
       }
      }
     },
     "auth_ref": [
      "r84",
      "r633",
      "r842"
     ]
    },
    "ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "CompActuallyPaidVsCoSelectedMeasureTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Compensation Actually Paid vs. Company Selected Measure",
        "label": "Compensation Actually Paid vs. Company Selected Measure [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r909"
     ]
    },
    "ecd_CompActuallyPaidVsNetIncomeTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "CompActuallyPaidVsNetIncomeTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Compensation Actually Paid vs. Net Income",
        "label": "Compensation Actually Paid vs. Net Income [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r908"
     ]
    },
    "ecd_CompActuallyPaidVsOtherMeasureTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "CompActuallyPaidVsOtherMeasureTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Compensation Actually Paid vs. Other Measure",
        "label": "Compensation Actually Paid vs. Other Measure [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r910"
     ]
    },
    "ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "CompActuallyPaidVsTotalShareholderRtnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Compensation Actually Paid vs. Total Shareholder Return",
        "label": "Compensation Actually Paid vs. Total Shareholder Return [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r907"
     ]
    },
    "us-gaap_CompensationAndRetirementDisclosureAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CompensationAndRetirementDisclosureAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Retirement Benefits [Abstract]",
        "label": "Retirement Benefits [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_ComprehensiveIncomeLossBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ComprehensiveIncomeLossBeforeTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Comprehensive income (loss), Gross",
        "label": "Comprehensive Income Loss Before Tax",
        "documentation": "Amount before tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_ComprehensiveIncomeLossTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ComprehensiveIncomeLossTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Comprehensive income (loss), Tax",
        "label": "Comprehensive Income Loss Tax",
        "documentation": "The tax effect of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ComprehensiveIncomeNetOfTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Comprehensive income (loss)",
        "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent",
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners."
       }
      }
     },
     "auth_ref": [
      "r36",
      "r185",
      "r187",
      "r193",
      "r605",
      "r649"
     ]
    },
    "us-gaap_ComprehensiveIncomeNetOfTaxAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ComprehensiveIncomeNetOfTaxAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]",
        "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ComprehensiveIncomeNoteTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ComprehensiveIncomeNoteTextBlock",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Comprehensive Income (Loss)",
        "label": "Comprehensive Income (Loss) Note [Text Block]",
        "documentation": "The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income."
       }
      }
     },
     "auth_ref": [
      "r90",
      "r192",
      "r604",
      "r645"
     ]
    },
    "us-gaap_CorporateDebtSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CorporateDebtSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Corporate securities",
        "label": "Corporate Debt Securities [Member]",
        "documentation": "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment."
       }
      }
     },
     "auth_ref": [
      "r828",
      "r830",
      "r1059"
     ]
    },
    "dei_CoverAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "CoverAbstract",
     "lang": {
      "en-us": {
       "role": {
        "label": "Cover [Abstract]",
        "documentation": "Cover page."
       }
      }
     },
     "auth_ref": []
    },
    "srt_CreditRatingAMBestAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "CreditRatingAMBestAxis",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Credit Rating, AM Best [Axis]",
        "label": "Credit Rating, AM Best [Axis]"
       }
      }
     },
     "auth_ref": [
      "r817",
      "r979",
      "r1003",
      "r1020"
     ]
    },
    "srt_CreditRatingAMBestDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "CreditRatingAMBestDomain",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Credit Rating, AM Best [Domain]",
        "label": "Credit Rating, AM Best [Domain]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_Creditlossexpenseoninvestmentportfolio": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "Creditlossexpenseoninvestmentportfolio",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net credit loss benefit (expense)",
        "label": "Credit loss expense on investment portfolio",
        "documentation": "The credit loss expensed during the period on investment portfolio."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_CurrentFederalTaxExpenseBenefit": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "CurrentFederalTaxExpenseBenefit",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current",
        "label": "Current Federal Tax Expense (Benefit)",
        "documentation": "Amount of current federal tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national tax expense (benefit) for non-US (United States of America) jurisdiction."
       }
      }
     },
     "auth_ref": [
      "r944",
      "r971",
      "r1019"
     ]
    },
    "dei_CurrentFiscalYearEndDate": {
     "xbrltype": "gMonthDayItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "CurrentFiscalYearEndDate",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current Fiscal Year End Date",
        "label": "Current Fiscal Year End Date",
        "documentation": "End date of current fiscal year in the format --MM-DD."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DebtAndEquitySecuritiesRealizedGainLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtAndEquitySecuritiesRealizedGainLoss",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net realized gains (losses) on disposals",
        "label": "Debt and Equity Securities, Realized Gain (Loss)",
        "documentation": "Amount of realized gain (loss) on investment in debt and equity securities."
       }
      }
     },
     "auth_ref": [
      "r763",
      "r764",
      "r792",
      "r793",
      "r794",
      "r962",
      "r963"
     ]
    },
    "sigi_DebtAndEquitySecuritiesRealizedGains": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "DebtAndEquitySecuritiesRealizedGains",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails": {
       "parentTag": "us-gaap_DebtAndEquitySecuritiesRealizedGainLoss",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Gross gains on sales",
        "label": "Debt and Equity Securities, Realized Gains",
        "documentation": "Amount of realized gains from sale of investment securities."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_DebtAndEquitySecuritiesRealizedLosses": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "DebtAndEquitySecuritiesRealizedLosses",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails": {
       "parentTag": "us-gaap_DebtAndEquitySecuritiesRealizedGainLoss",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Gross losses on sales",
        "label": "Debt and Equity Securities, Realized Losses",
        "documentation": "Amount of realized losses from sale of investment securities."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DebtInstrumentInterestRateStatedPercentage": {
     "xbrltype": "percentItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtInstrumentInterestRateStatedPercentage",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Interest rate",
        "label": "Debt Instrument, Interest Rate, Stated Percentage",
        "documentation": "Contractual interest rate for funds borrowed, under the debt agreement."
       }
      }
     },
     "auth_ref": [
      "r29",
      "r379"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLoss",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fixed income securities, available-for-sale, allowance for credit loss",
        "negatedTerseLabel": "Allowance for Credit Losses",
        "periodStartLabel": "Beginning Balance",
        "periodEndLabel": "Ending Balance",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss",
        "documentation": "Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r286",
      "r335",
      "r344",
      "r350"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Current Provision for Securities without Prior Allowance",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded",
        "documentation": "Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded."
       }
      }
     },
     "auth_ref": [
      "r345"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)",
        "documentation": "Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance."
       }
      }
     },
     "auth_ref": [
      "r349"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase",
        "documentation": "Amount of increase in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and beneficial interest, purchased with credit deterioration."
       }
      }
     },
     "auth_ref": [
      "r346"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Reductions for Securities Sold",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold",
        "documentation": "Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale."
       }
      }
     },
     "auth_ref": [
      "r347"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSellBeforeRecovery": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossSellBeforeRecovery",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery",
        "documentation": "Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis."
       }
      }
     },
     "auth_ref": [
      "r348"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Allowance for Credit Loss Rollforward [Table]",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table]",
        "documentation": "Disclosure of information about allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r343"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Debt Securities, Available-for-Sale, Allowance for Credit Loss",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block]",
        "documentation": "Tabular disclosure of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r343"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails": {
       "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "AFS Fair Value, 12 months or longer",
        "label": "Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer",
        "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."
       }
      }
     },
     "auth_ref": [
      "r137",
      "r341",
      "r820"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails": {
       "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "AFS Unrealized Losses, 12 months or longer",
        "label": "Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss",
        "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."
       }
      }
     },
     "auth_ref": [
      "r137",
      "r341"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails": {
       "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "AFS Fair Value, Less than 12 Months",
        "label": "Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months",
        "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."
       }
      }
     },
     "auth_ref": [
      "r137",
      "r341",
      "r820"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails": {
       "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "AFS Unrealized Losses, Less than 12 months",
        "label": "Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss",
        "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."
       }
      }
     },
     "auth_ref": [
      "r137",
      "r341"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput": {
     "xbrltype": "decimalItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleMeasurementInput",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt securities, available-for-sale, measurement input",
        "label": "Debt Securities, Available-for-Sale, Measurement Input",
        "documentation": "Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r535"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Available-for-sale Securities [Table]",
        "label": "Debt Securities, Available-for-Sale [Table]",
        "documentation": "Disclosure of information about investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale)."
       }
      }
     },
     "auth_ref": [
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r288",
      "r289",
      "r290",
      "r291",
      "r292",
      "r293",
      "r294"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPosition",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "AFS Fair Value",
        "label": "Debt Securities, Available-for-Sale, Unrealized Loss Position",
        "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 unrealized loss position without allowance for credit loss."
       }
      }
     },
     "auth_ref": [
      "r135",
      "r339",
      "r820"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTotalLabel": "AFS Unrealized Losses",
        "label": "Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss",
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset."
       }
      }
     },
     "auth_ref": [
      "r136",
      "r340"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]",
        "label": "Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]",
        "documentation": "Disclosure of information about investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset."
       }
      }
     },
     "auth_ref": [
      "r338",
      "r820"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Quantitative Information about Unrealized Losses on AFS",
        "label": "Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]",
        "documentation": "Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset."
       }
      }
     },
     "auth_ref": [
      "r134",
      "r820",
      "r1004"
     ]
    },
    "us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]",
        "label": "Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r343"
     ]
    },
    "sigi_DebtSecuritiesAvailableforsaleAllowanceforCreditLossGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "DebtSecuritiesAvailableforsaleAllowanceforCreditLossGross",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amounts reclassified into net income (loss): Credit loss (benefit) expense, Gross",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Gross",
        "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized amounts realized upon a credit-related impairment loss."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_DebtSecuritiesAvailableforsaleAllowanceforCreditLossNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "DebtSecuritiesAvailableforsaleAllowanceforCreditLossNet",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
       "weight": 1.0,
       "order": 4.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Credit loss (benefit) expense",
        "totalLabel": "Amounts reclassified into net income (loss): Credit loss (benefit) expense, Net",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Net",
        "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized amounts realized upon a credit-related impairment loss."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_DebtSecuritiesAvailableforsaleAllowanceforCreditLossTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "DebtSecuritiesAvailableforsaleAllowanceforCreditLossTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amounts reclassified into net income (loss): Credit loss (benefit) expense, Tax",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Tax",
        "documentation": "Amount of tax on reclassification adjustment from accumulated other comprehensive income for unrealized amounts realized upon a credit-related impairment loss."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesHeldToMaturityAllowanceForCreditLoss",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Less: allowance for credit losses",
        "label": "Debt Securities, Held-to-Maturity, Allowance for Credit Loss",
        "documentation": "Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity)."
       }
      }
     },
     "auth_ref": [
      "r297",
      "r323",
      "r326",
      "r330"
     ]
    },
    "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Fixed income securities, held-to-maturity, net of allowance for credit losses",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss",
        "documentation": "Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity)."
       }
      }
     },
     "auth_ref": [
      "r281",
      "r298",
      "r300",
      "r603"
     ]
    },
    "us-gaap_DeferredFederalIncomeTaxExpenseBenefit": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DeferredFederalIncomeTaxExpenseBenefit",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_IncomeTaxExpenseBenefit",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Deferred",
        "label": "Deferred Federal Income Tax Expense (Benefit)",
        "documentation": "Amount of deferred federal tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, deferred national tax expense (benefit) for non-US (United States of America) jurisdiction."
       }
      }
     },
     "auth_ref": [
      "r971",
      "r1018",
      "r1019"
     ]
    },
    "us-gaap_DeferredFinanceCostsNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DeferredFinanceCostsNet",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Unamortized debt issuance costs",
        "label": "Debt Issuance Costs, Net",
        "documentation": "Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs."
       }
      }
     },
     "auth_ref": [
      "r73",
      "r1013"
     ]
    },
    "us-gaap_DeferredIncomeTaxAssetsNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DeferredIncomeTaxAssetsNet",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 9.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Deferred federal income tax",
        "label": "Deferred Income Tax Assets, Net",
        "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting."
       }
      }
     },
     "auth_ref": [
      "r496",
      "r497"
     ]
    },
    "us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DeferredPolicyAcquisitionCostAmortizationExpense",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amortization of deferred policy acquisition costs",
        "label": "Deferred Policy Acquisition Costs, Amortization Expense",
        "documentation": "Amount of amortization expense (reversal of expense) for deferred policy acquisition costs."
       }
      }
     },
     "auth_ref": [
      "r144",
      "r653",
      "r672",
      "r673",
      "r683",
      "r843",
      "r967",
      "r1037"
     ]
    },
    "us-gaap_DeferredPolicyAcquisitionCosts": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DeferredPolicyAcquisitionCosts",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 11.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Deferred policy acquisition costs",
        "label": "Deferred Policy Acquisition Cost",
        "documentation": "Amount of deferred policy acquisition cost capitalized on contract remaining in force."
       }
      }
     },
     "auth_ref": [
      "r149",
      "r639",
      "r673",
      "r674",
      "r683",
      "r843"
     ]
    },
    "us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlanAmortizationOfGainsLosses",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails": {
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Amortization of unrecognized net actuarial loss",
        "label": "Defined Benefit Plan, Amortization of Gain (Loss)",
        "documentation": "Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r393",
      "r431",
      "r453",
      "r830",
      "r831"
     ]
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate": {
     "xbrltype": "percentItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Discount rate",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate",
        "documentation": "Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r438"
     ]
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets": {
     "xbrltype": "percentItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Expected return on plan assets",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets",
        "documentation": "Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r439",
      "r458"
     ]
    },
    "us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlanExpectedReturnOnPlanAssets",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails": {
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Expected return on plan assets",
        "label": "Defined Benefit Plan, Expected Return (Loss) on Plan Assets",
        "documentation": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r393",
      "r430",
      "r452",
      "r830",
      "r831"
     ]
    },
    "us-gaap_DefinedBenefitPlanInterestCost": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlanInterestCost",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails": {
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Interest cost",
        "label": "Defined Benefit Plan, Interest Cost",
        "documentation": "Amount of cost recognized for passage of time related to defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r393",
      "r397",
      "r429",
      "r451",
      "r830",
      "r831"
     ]
    },
    "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlanNetPeriodicBenefitCost",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total net periodic pension cost (benefit)",
        "label": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit)",
        "documentation": "Amount of net periodic benefit cost (credit) for defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r427",
      "r449",
      "r830",
      "r831"
     ]
    },
    "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]",
        "label": "Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]",
        "documentation": "Disclosures and provisions pertaining to defined benefit pension plans or other postretirement defined benefit plans. The arrangements are generally based on terms and conditions stipulated by the entity, and which contain a promise by the employer to pay certain amounts or awards at designated future dates, including a period after retirement, upon compliance with stipulated requirements. Excludes disclosures pertaining to defined contribution plans."
       }
      }
     },
     "auth_ref": [
      "r13",
      "r61",
      "r62",
      "r63",
      "r64"
     ]
    },
    "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]",
        "label": "Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DepreciationAmortizationAndAccretionNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DepreciationAmortizationAndAccretionNet",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Depreciation and amortization",
        "label": "Depreciation, Amortization and Accretion, Net",
        "documentation": "The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method."
       }
      }
     },
     "auth_ref": [
      "r11"
     ]
    },
    "us-gaap_DirectPremiumsEarned": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DirectPremiumsEarned",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_PremiumsEarnedNetPropertyAndCasualty",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Direct",
        "label": "Direct Premiums Earned",
        "documentation": "Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned."
       }
      }
     },
     "auth_ref": [
      "r667",
      "r691",
      "r694",
      "r1047"
     ]
    },
    "us-gaap_DirectPremiumsWritten": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DirectPremiumsWritten",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Direct",
        "label": "Direct Premiums Written",
        "documentation": "Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written."
       }
      }
     },
     "auth_ref": [
      "r691"
     ]
    },
    "us-gaap_DividendsCommonStock": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DividendsCommonStock",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Dividends to common stockholders",
        "label": "Dividends, Common Stock",
        "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK)."
       }
      }
     },
     "auth_ref": [
      "r8",
      "r109"
     ]
    },
    "us-gaap_DividendsPreferredStockCash": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "DividendsPreferredStockCash",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Dividends to preferred stockholders",
        "label": "Dividends, Preferred Stock, Cash",
        "documentation": "Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash."
       }
      }
     },
     "auth_ref": [
      "r8",
      "r109"
     ]
    },
    "dei_DocumentFiscalPeriodFocus": {
     "xbrltype": "fiscalPeriodItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentFiscalPeriodFocus",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Fiscal Period Focus",
        "label": "Document Fiscal Period Focus",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentFiscalYearFocus": {
     "xbrltype": "gYearItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentFiscalYearFocus",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Fiscal Year Focus",
        "label": "Document Fiscal Year Focus",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentInformationLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentInformationLineItems",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Information [Line Items]",
        "label": "Document Information [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentInformationTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentInformationTable",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Information [Table]",
        "label": "Document Information [Table]",
        "documentation": "Container to support the formal attachment of each official or unofficial, public or private document as part of a submission package."
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentPeriodEndDate": {
     "xbrltype": "dateItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentPeriodEndDate",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Period End Date",
        "label": "Document Period End Date",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentQuarterlyReport": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentQuarterlyReport",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Quarterly Report",
        "label": "Document Quarterly Report",
        "documentation": "Boolean flag that is true only for a form used as an quarterly report."
       }
      }
     },
     "auth_ref": [
      "r865"
     ]
    },
    "dei_DocumentTransitionReport": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentTransitionReport",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Transition Report",
        "label": "Document Transition Report",
        "documentation": "Boolean flag that is true only for a form used as a transition report."
       }
      }
     },
     "auth_ref": [
      "r898"
     ]
    },
    "dei_DocumentType": {
     "xbrltype": "submissionTypeItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "DocumentType",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Type",
        "label": "Document Type",
        "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'."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_ESLinesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ESLinesMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "E&amp;S",
        "terseLabel": "E&amp;S Lines",
        "label": "E&amp;S Lines [Member]",
        "documentation": "This represents our E&amp;S Lines of business"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_EarningsPerShareAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EarningsPerShareAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Earnings per common share:",
        "label": "Earnings Per Share [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_EarningsPerShareBasic": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EarningsPerShareBasic",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Net income (loss) available to common stockholders - Basic (in dollars per share)",
        "terseLabel": "Basic (in dollars per share)",
        "label": "Earnings Per Share, Basic",
        "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period."
       }
      }
     },
     "auth_ref": [
      "r194",
      "r217",
      "r218",
      "r219",
      "r220",
      "r221",
      "r228",
      "r231",
      "r238",
      "r239",
      "r240",
      "r244",
      "r524",
      "r525",
      "r606",
      "r650",
      "r813"
     ]
    },
    "sigi_EarningsPerShareBasicAndDilutedEPSAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "EarningsPerShareBasicAndDilutedEPSAbstract",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "EPS:",
        "label": "Earnings Per Share, Basic and Diluted EPS [Abstract]",
        "documentation": "Earnings Per Share, Basic and Diluted EPS"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_EarningsPerShareDiluted": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EarningsPerShareDiluted",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net income (loss) available to common stockholders - Diluted (in dollars per share)",
        "verboseLabel": "Diluted (in dollars per share)",
        "label": "Earnings Per Share, Diluted",
        "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."
       }
      }
     },
     "auth_ref": [
      "r194",
      "r217",
      "r218",
      "r219",
      "r220",
      "r221",
      "r231",
      "r238",
      "r239",
      "r240",
      "r244",
      "r524",
      "r525",
      "r606",
      "r650",
      "r813"
     ]
    },
    "us-gaap_EarningsPerShareTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EarningsPerShareTextBlock",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShare"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Earnings per Common Share",
        "label": "Earnings Per Share [Text Block]",
        "documentation": "The entire disclosure for earnings per share."
       }
      }
     },
     "auth_ref": [
      "r227",
      "r241",
      "r242",
      "r243"
     ]
    },
    "sigi_EffectiveInterestRateforCalculationofInterestCost": {
     "xbrltype": "percentItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "EffectiveInterestRateforCalculationofInterestCost",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Effective interest rate for calculation of interest cost",
        "label": "Effective Interest Rate for Calculation of Interest Cost",
        "documentation": "The effective interest rate used to calculate interest cost related to the Pension Plan."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_EffectsOfReinsuranceLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EffectsOfReinsuranceLineItems",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Effects of Reinsurance [Line Items]",
        "label": "Effects of Reinsurance [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_EffectsOfReinsuranceTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EffectsOfReinsuranceTable",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Effects of Reinsurance [Table]",
        "label": "Effects of Reinsurance [Table]",
        "documentation": "Disclosure of information about the effects of reinsurance, including, but not limited to, disclosure of direct, assumed, and ceded insurance."
       }
      }
     },
     "auth_ref": [
      "r14"
     ]
    },
    "us-gaap_EffectsOfReinsuranceTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EffectsOfReinsuranceTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Direct, Assumed, and Ceded Reinsurance Amounts",
        "label": "Effects of Reinsurance [Table Text Block]",
        "documentation": "Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance."
       }
      }
     },
     "auth_ref": [
      "r14"
     ]
    },
    "us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EmployeeRelatedLiabilitiesCurrentAndNoncurrent",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Accrued salaries and benefits",
        "label": "Employee-related Liabilities",
        "documentation": "Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits."
       }
      }
     },
     "auth_ref": [
      "r74",
      "r1041"
     ]
    },
    "us-gaap_EmployeeStockOptionMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EmployeeStockOptionMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Employee Stock Option",
        "label": "Share-Based Payment Arrangement, Option [Member]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressAddressLine1": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityAddressAddressLine1",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, Address Line One",
        "label": "Entity Address, Address Line One",
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressCityOrTown": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityAddressCityOrTown",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, City or Town",
        "label": "Entity Address, City or Town",
        "documentation": "Name of the City or Town"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressPostalZipCode": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityAddressPostalZipCode",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, Postal Zip Code",
        "label": "Entity Address, Postal Zip Code",
        "documentation": "Code for the postal or zip code"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressStateOrProvince": {
     "xbrltype": "stateOrProvinceItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityAddressStateOrProvince",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, State or Province",
        "label": "Entity Address, State or Province",
        "documentation": "Name of the state or province."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityCentralIndexKey": {
     "xbrltype": "centralIndexKeyItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityCentralIndexKey",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Central Index Key",
        "label": "Entity Central Index Key",
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityCommonStockSharesOutstanding",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Common Stock, Shares Outstanding",
        "label": "Entity Common Stock, Shares Outstanding",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityCurrentReportingStatus": {
     "xbrltype": "yesNoItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityCurrentReportingStatus",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Current Reporting Status",
        "label": "Entity Current Reporting Status",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityEmergingGrowthCompany": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityEmergingGrowthCompany",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Emerging Growth Company",
        "label": "Entity Emerging Growth Company",
        "documentation": "Indicate if registrant meets the emerging growth company criteria."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "dei_EntityFileNumber": {
     "xbrltype": "fileNumberItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityFileNumber",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity File Number",
        "label": "Entity File Number",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityFilerCategory": {
     "xbrltype": "filerCategoryItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityFilerCategory",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Filer Category",
        "label": "Entity Filer Category",
        "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."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "dei_EntityIncorporationStateCountryCode": {
     "xbrltype": "edgarStateCountryItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityIncorporationStateCountryCode",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Incorporation, State or Country Code",
        "label": "Entity Incorporation, State or Country Code",
        "documentation": "Two-character EDGAR code representing the state or country of incorporation."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityInteractiveDataCurrent": {
     "xbrltype": "yesNoItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityInteractiveDataCurrent",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Interactive Data Current",
        "label": "Entity Interactive Data Current",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r937"
     ]
    },
    "dei_EntityRegistrantName": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityRegistrantName",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Registrant Name",
        "label": "Entity Registrant Name",
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "dei_EntityShellCompany": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityShellCompany",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Shell Company",
        "label": "Entity Shell Company",
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "dei_EntitySmallBusiness": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntitySmallBusiness",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Small Business",
        "label": "Entity Small Business",
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC)."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "dei_EntityTaxIdentificationNumber": {
     "xbrltype": "employerIdItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "EntityTaxIdentificationNumber",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Tax Identification Number",
        "label": "Entity Tax Identification Number",
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS."
       }
      }
     },
     "auth_ref": [
      "r863"
     ]
    },
    "us-gaap_EquityComponentDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EquityComponentDomain",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Equity Component [Domain]",
        "label": "Equity Component [Domain]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r162",
      "r188",
      "r189",
      "r190",
      "r208",
      "r209",
      "r210",
      "r214",
      "r222",
      "r224",
      "r245",
      "r319",
      "r322",
      "r390",
      "r493",
      "r494",
      "r495",
      "r499",
      "r500",
      "r514",
      "r515",
      "r516",
      "r517",
      "r518",
      "r520",
      "r523",
      "r549",
      "r551",
      "r552",
      "r553",
      "r554",
      "r555",
      "r565",
      "r680",
      "r681",
      "r682",
      "r706",
      "r777"
     ]
    },
    "us-gaap_EquitySecuritiesFvNi": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EquitySecuritiesFvNi",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails": {
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Equity securities \u2013 at fair value (cost:\u00a0$187,286 \u2013 2024; $183,076 \u2013 2023)",
        "verboseLabel": "Equity securities",
        "label": "Equity Securities, FV-NI, Current",
        "documentation": "Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current."
       }
      }
     },
     "auth_ref": [
      "r170",
      "r543",
      "r812"
     ]
    },
    "us-gaap_EquitySecuritiesFvNiCost": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EquitySecuritiesFvNiCost",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Equity securities, cost",
        "label": "Equity Securities, FV-NI, Cost",
        "documentation": "Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value."
       }
      }
     },
     "auth_ref": [
      "r625"
     ]
    },
    "us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EquitySecuritiesFvNiUnrealizedGainLoss",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails",
      "http://www.selective.com/role/InvestmentsScheduleofRealizedandUnrealizedGainsLossesonEquitySecuritiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net unrealized gains (losses) on equity securities",
        "verboseLabel": "Total unrealized gains (losses) recognized in income on equity securities",
        "label": "Equity Securities, FV-NI, Unrealized Gain (Loss)",
        "documentation": "Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI)."
       }
      }
     },
     "auth_ref": [
      "r651",
      "r994"
     ]
    },
    "us-gaap_EquitySecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "EquitySecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails",
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Equity securities",
        "label": "Equity Securities [Member]",
        "documentation": "Ownership interest or right to acquire or dispose of ownership interest in corporations and other legal entities for which ownership interest is represented by shares of common or preferred stock, convertible securities, stock rights, or stock warrants."
       }
      }
     },
     "auth_ref": [
      "r53",
      "r856",
      "r857",
      "r858",
      "r1064"
     ]
    },
    "ecd_EquityValuationAssumptionDifferenceFnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "EquityValuationAssumptionDifferenceFnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Equity Valuation Assumption Difference, Footnote",
        "label": "Equity Valuation Assumption Difference, Footnote [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r906"
     ]
    },
    "ecd_ErrCompAnalysisTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ErrCompAnalysisTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Erroneous Compensation Analysis",
        "label": "Erroneous Compensation Analysis [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r870",
      "r881",
      "r891",
      "r916"
     ]
    },
    "ecd_ErrCompRecoveryTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ErrCompRecoveryTable",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Erroneously Awarded Compensation Recovery",
        "label": "Erroneously Awarded Compensation Recovery [Table]"
       }
      }
     },
     "auth_ref": [
      "r867",
      "r878",
      "r888",
      "r913"
     ]
    },
    "ecd_ExecutiveCategoryAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ExecutiveCategoryAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Executive Category:",
        "label": "Executive Category [Axis]"
       }
      }
     },
     "auth_ref": [
      "r912"
     ]
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "label": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r531",
      "r532",
      "r540"
     ]
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table]",
        "label": "Fair Value, Recurring and Nonrecurring [Table]",
        "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis."
       }
      }
     },
     "auth_ref": [
      "r531",
      "r532",
      "r540"
     ]
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Fair Value Measurement Inputs and Valuation Techniques",
        "label": "Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]",
        "documentation": "Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis."
       }
      }
     },
     "auth_ref": [
      "r18"
     ]
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Asset Class [Domain]",
        "label": "Asset Class [Domain]",
        "documentation": "Class of asset."
       }
      }
     },
     "auth_ref": [
      "r19"
     ]
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]",
        "documentation": "Schedule of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets using significant unobservable inputs (level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include, but is not limited to: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset."
       }
      }
     },
     "auth_ref": [
      "r19",
      "r70"
     ]
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Summary of the Changes in Fair Value of Securities Using Level 3 Inputs",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]",
        "documentation": "Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset."
       }
      }
     },
     "auth_ref": [
      "r19",
      "r70"
     ]
    },
    "us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]",
        "label": "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FairValueByAssetClassAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueByAssetClassAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Asset Class [Axis]",
        "label": "Asset Class [Axis]",
        "documentation": "Information by class of asset."
       }
      }
     },
     "auth_ref": [
      "r68",
      "r70"
     ]
    },
    "us-gaap_FairValueByBalanceSheetGroupingTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueByBalanceSheetGroupingTable",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, by Balance Sheet Grouping [Table]",
        "label": "Fair Value, by Balance Sheet Grouping [Table]",
        "documentation": "Disclosure of information about the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities."
       }
      }
     },
     "auth_ref": [
      "r68",
      "r71",
      "r72"
     ]
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value Hierarchy and NAV [Axis]",
        "label": "Fair Value Hierarchy and NAV [Axis]",
        "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient."
       }
      }
     },
     "auth_ref": [
      "r380",
      "r418",
      "r419",
      "r420",
      "r421",
      "r422",
      "r423",
      "r532",
      "r570",
      "r571",
      "r572",
      "r822",
      "r823",
      "r828",
      "r829",
      "r830"
     ]
    },
    "us-gaap_FairValueByMeasurementBasisAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueByMeasurementBasisAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Measurement Basis [Axis]",
        "label": "Measurement Basis [Axis]",
        "documentation": "Information by measurement basis."
       }
      }
     },
     "auth_ref": [
      "r23",
      "r68",
      "r380",
      "r822",
      "r823"
     ]
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueByMeasurementFrequencyAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Measurement Frequency [Axis]",
        "label": "Measurement Frequency [Axis]",
        "documentation": "Information by measurement frequency."
       }
      }
     },
     "auth_ref": [
      "r531",
      "r532",
      "r534",
      "r535",
      "r541"
     ]
    },
    "us-gaap_FairValueDisclosureItemAmountsDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueDisclosureItemAmountsDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value Measurement [Domain]",
        "label": "Fair Value Measurement [Domain]",
        "documentation": "Measurement basis, for example, but not limited to, reported value, fair value, portion at fair value, portion at other than fair value."
       }
      }
     },
     "auth_ref": [
      "r380",
      "r822",
      "r823"
     ]
    },
    "us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Quantitative Information of Financial Assets and Liabilities, Disclosed at Fair Value",
        "label": "Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table Text Block]",
        "documentation": "Tabular disclosure of information about fair value of asset and liability not measured at fair value."
       }
      }
     },
     "auth_ref": [
      "r539"
     ]
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueDisclosuresAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value Disclosures [Abstract]",
        "label": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FairValueDisclosuresTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueDisclosuresTextBlock",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value Measurements",
        "label": "Fair Value Disclosures [Text Block]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r530"
     ]
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueInputsLevel1Member",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Quoted Prices in \u2028Active Markets for\u2028Identical Assets/\u2028Liabilities (Level 1)",
        "label": "Fair Value, Inputs, Level 1 [Member]",
        "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date."
       }
      }
     },
     "auth_ref": [
      "r380",
      "r418",
      "r423",
      "r532",
      "r570",
      "r828",
      "r829",
      "r830"
     ]
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueInputsLevel2Member",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Significant Other Observable Inputs (Level 2)",
        "label": "Fair Value, Inputs, Level 2 [Member]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r380",
      "r418",
      "r423",
      "r532",
      "r571",
      "r822",
      "r823",
      "r828",
      "r829",
      "r830"
     ]
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueInputsLevel3Member",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Significant Unobservable Inputs (Level 3)",
        "label": "Fair Value, Inputs, Level 3 [Member]",
        "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing."
       }
      }
     },
     "auth_ref": [
      "r380",
      "r418",
      "r419",
      "r420",
      "r421",
      "r422",
      "r423",
      "r532",
      "r572",
      "r822",
      "r823",
      "r828",
      "r829",
      "r830"
     ]
    },
    "us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasuredAtNetAssetValuePerShareMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value Measured at Net Asset Value Per Share",
        "label": "Fair Value Measured at Net Asset Value Per Share [Member]",
        "documentation": "Fair value measured at net asset value per share as practical expedient."
       }
      }
     },
     "auth_ref": [
      "r418",
      "r529",
      "r541"
     ]
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementFrequencyDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Measurement Frequency [Domain]",
        "label": "Measurement Frequency [Domain]",
        "documentation": "Measurement frequency."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total net gains (losses) for the period included in net income",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings",
        "documentation": "Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3)."
       }
      }
     },
     "auth_ref": [
      "r536"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total net gains (losses) for the period included in OCI",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)",
        "documentation": "Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3)."
       }
      }
     },
     "auth_ref": [
      "r537"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Issuances",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances",
        "documentation": "Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing."
       }
      }
     },
     "auth_ref": [
      "r69"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Purchases",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases",
        "documentation": "Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing."
       }
      }
     },
     "auth_ref": [
      "r69"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Sales",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales",
        "documentation": "Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing."
       }
      }
     },
     "auth_ref": [
      "r69"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Settlements",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements",
        "documentation": "Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing."
       }
      }
     },
     "auth_ref": [
      "r69"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Transfers into Level 3",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3",
        "documentation": "Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy."
       }
      }
     },
     "auth_ref": [
      "r538"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Transfers out of Level 3",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3",
        "documentation": "Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy."
       }
      }
     },
     "auth_ref": [
      "r538"
     ]
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Fair value, beginning balance",
        "periodEndLabel": "Fair value, ending balance",
        "terseLabel": "Total Level 3 securities",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value",
        "documentation": "Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing."
       }
      }
     },
     "auth_ref": [
      "r19"
     ]
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Measurements, Fair Value Hierarchy [Domain]",
        "label": "Fair Value Hierarchy and NAV [Domain]",
        "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value."
       }
      }
     },
     "auth_ref": [
      "r380",
      "r418",
      "r419",
      "r420",
      "r421",
      "r422",
      "r423",
      "r570",
      "r571",
      "r572",
      "r822",
      "r823",
      "r828",
      "r829",
      "r830"
     ]
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FairValueMeasurementsRecurringMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fair Value, Recurring",
        "label": "Fair Value, Recurring [Member]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r530",
      "r541"
     ]
    },
    "sigi_FairValueOfSecurityOwnedAndPledgedAsCollateral": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "FairValueOfSecurityOwnedAndPledgedAsCollateral",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Securities owned and pledged as collateral, fair value",
        "label": "Fair Value of Security Owned and Pledged as Collateral",
        "documentation": "Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions."
       }
      }
     },
     "auth_ref": []
    },
    "srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal Home Loan Bank Branch [Axis]",
        "label": "Federal Home Loan Bank Branch [Axis]"
       }
      }
     },
     "auth_ref": [
      "r1036"
     ]
    },
    "srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankStateDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "FederalHomeLoanBankAdvancesBranchOfFHLBBankStateDomain",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal Home Loan Bank Branch [Domain]",
        "label": "Federal Home Loan Bank Branch [Domain]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Securities pledged as collateral with FHLB",
        "label": "Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged",
        "documentation": "Amount of the collateral pledged in support of federal home loan bank advances outstanding."
       }
      }
     },
     "auth_ref": [
      "r78",
      "r121"
     ]
    },
    "srt_FederalHomeLoanBankOfIndianapolisMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "FederalHomeLoanBankOfIndianapolisMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal Home Loan Bank of Indianapolis",
        "label": "Federal Home Loan Bank of Indianapolis [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "srt_FederalHomeLoanBankOfNewYorkMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "FederalHomeLoanBankOfNewYorkMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal Home Loan Bank of New York",
        "label": "Federal Home Loan Bank of New York [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FinanceLeaseInterestPaymentOnLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinanceLeaseInterestPaymentOnLiability",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Operating cash flows from financing leases",
        "label": "Finance Lease, Interest Payment on Liability",
        "documentation": "Amount of interest paid on finance lease liability."
       }
      }
     },
     "auth_ref": [
      "r560",
      "r562"
     ]
    },
    "us-gaap_FinanceLeaseLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinanceLeaseLiability",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Finance lease obligations",
        "label": "Finance Lease, Liability",
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease."
       }
      }
     },
     "auth_ref": [
      "r558",
      "r564"
     ]
    },
    "us-gaap_FinanceLeasePrincipalPayments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinanceLeasePrincipalPayments",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0,
       "order": 7.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Repayments of finance lease obligations",
        "terseLabel": "Financing cash flows from finance leases",
        "label": "Finance Lease, Principal Payments",
        "documentation": "Amount of cash outflow for principal payment on finance lease."
       }
      }
     },
     "auth_ref": [
      "r559",
      "r562"
     ]
    },
    "us-gaap_FinancialAssetNotPastDueMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancialAssetNotPastDueMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current",
        "label": "Financial Asset, Not Past Due [Member]",
        "documentation": "Financial asset not past due."
       }
      }
     },
     "auth_ref": [
      "r331",
      "r819"
     ]
    },
    "us-gaap_FinancialAssetPastDueMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancialAssetPastDueMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Past Due",
        "label": "Financial Asset, Past Due [Member]",
        "documentation": "Financial asset past due."
       }
      }
     },
     "auth_ref": [
      "r331",
      "r819",
      "r981"
     ]
    },
    "us-gaap_FinancialInstrumentAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancialInstrumentAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financial Instruments [Axis]",
        "verboseLabel": "Financial Instrument [Axis]",
        "label": "Financial Instrument [Axis]",
        "documentation": "Information by type of financial instrument."
       }
      }
     },
     "auth_ref": [
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r288",
      "r289",
      "r290",
      "r291",
      "r292",
      "r293",
      "r294",
      "r295",
      "r296",
      "r297",
      "r298",
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r306",
      "r307",
      "r308",
      "r309",
      "r310",
      "r311",
      "r312",
      "r324",
      "r325",
      "r331",
      "r332",
      "r333",
      "r337",
      "r342",
      "r343",
      "r382",
      "r388",
      "r521",
      "r567",
      "r568",
      "r569",
      "r570",
      "r571",
      "r572",
      "r573",
      "r574",
      "r575",
      "r576",
      "r577",
      "r578",
      "r579",
      "r580",
      "r581",
      "r582",
      "r583",
      "r584",
      "r585",
      "r586",
      "r587",
      "r588",
      "r589",
      "r590",
      "r591",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r646",
      "r820",
      "r947",
      "r948",
      "r949",
      "r950",
      "r951",
      "r952",
      "r953",
      "r990",
      "r991",
      "r992",
      "r993"
     ]
    },
    "us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financial Instruments Owned and Pledged as Collateral [Line Items]",
        "label": "Financial Instruments Owned and Pledged as Collateral [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r580",
      "r727"
     ]
    },
    "us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancialInstrumentsOwnedAndPledgedAsCollateralTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financial Instruments Owned and Pledged as Collateral [Table]",
        "label": "Financial Instruments Owned and Pledged as Collateral [Table]",
        "documentation": "Financial instruments held by a broker-dealer for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities."
       }
      }
     },
     "auth_ref": [
      "r113",
      "r580",
      "r727"
     ]
    },
    "us-gaap_FinancingReceivablesPeriodPastDueAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancingReceivablesPeriodPastDueAxis",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financial Asset, Aging [Axis]",
        "label": "Financial Asset, Aging [Axis]",
        "documentation": "Information by period in which financial asset is past due or not past due."
       }
      }
     },
     "auth_ref": [
      "r153",
      "r331",
      "r819"
     ]
    },
    "us-gaap_FinancingReceivablesPeriodPastDueDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FinancingReceivablesPeriodPastDueDomain",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financial Asset, Aging [Domain]",
        "label": "Financial Asset, Aging [Domain]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r153",
      "r331",
      "r819"
     ]
    },
    "sigi_FivePointThreeHundredSeventyFiveMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "FivePointThreeHundredSeventyFiveMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "5.375% Senior Notes",
        "label": "Five Point Three Hundred Seventy Five [Member]",
        "documentation": "This item represents the 5.375% Senior Notes of the company due 2049."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_FixedIncomeSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FixedIncomeSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fixed income securities, AFS",
        "label": "Fixed Income Securities [Member]",
        "documentation": "Investment that provides a return in the form of fixed periodic payments and eventual return of principal at maturity."
       }
      }
     },
     "auth_ref": [
      "r830",
      "r847",
      "r848",
      "r1016"
     ]
    },
    "us-gaap_FixedMaturitiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "FixedMaturitiesMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Fixed income securities",
        "label": "Fixed Maturities [Member]",
        "documentation": "This element provides types of investments that may be contained within the fixed maturity category which are securities having a stated final repayment date. Examples of items within this category may include bonds, including convertibles and bonds with warrants, and redeemable preferred stocks."
       }
      }
     },
     "auth_ref": [
      "r15"
     ]
    },
    "us-gaap_ForeignGovernmentDebtSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ForeignGovernmentDebtSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Foreign government",
        "label": "Debt Security, Government, Non-US [Member]",
        "documentation": "Debt security issued by government not domiciled in United States of America (US)."
       }
      }
     },
     "auth_ref": [
      "r1016",
      "r1059"
     ]
    },
    "ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Forgone Recovery due to Disqualification of Tax Benefits, Amount",
        "label": "Forgone Recovery due to Disqualification of Tax Benefits, Amount"
       }
      }
     },
     "auth_ref": [
      "r874",
      "r885",
      "r895",
      "r920"
     ]
    },
    "ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ForgoneRecoveryDueToExpenseOfEnforcementAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Forgone Recovery due to Expense of Enforcement, Amount",
        "label": "Forgone Recovery due to Expense of Enforcement, Amount"
       }
      }
     },
     "auth_ref": [
      "r874",
      "r885",
      "r895",
      "r920"
     ]
    },
    "ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ForgoneRecoveryDueToViolationOfHomeCountryLawAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Forgone Recovery due to Violation of Home Country Law, Amount",
        "label": "Forgone Recovery due to Violation of Home Country Law, Amount"
       }
      }
     },
     "auth_ref": [
      "r874",
      "r885",
      "r895",
      "r920"
     ]
    },
    "ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ForgoneRecoveryExplanationOfImpracticabilityTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Forgone Recovery, Explanation of Impracticability",
        "label": "Forgone Recovery, Explanation of Impracticability [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r874",
      "r885",
      "r895",
      "r920"
     ]
    },
    "ecd_ForgoneRecoveryIndName": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "ForgoneRecoveryIndName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Name",
        "label": "Forgone Recovery, Individual Name"
       }
      }
     },
     "auth_ref": [
      "r874",
      "r885",
      "r895",
      "r920"
     ]
    },
    "us-gaap_GainLossOnInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "GainLossOnInvestments",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails": {
       "parentTag": "sigi_TotalInvestmentsRevenue",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0,
       "order": 3.0
      },
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net realized and unrealized investment gains (losses)",
        "negatedLabel": "Net realized and unrealized (gains) losses",
        "label": "Gain (Loss) on Investments",
        "documentation": "Amount of realized and unrealized gain (loss) on investment."
       }
      }
     },
     "auth_ref": [
      "r97",
      "r938"
     ]
    },
    "us-gaap_GainLossOnInvestmentsMember1": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "GainLossOnInvestmentsMember1",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net realized and unrealized gains (losses)",
        "label": "Gain (Loss) on Investments [Member]",
        "documentation": "Primary financial statement caption encompassing gain (loss) on investments."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_GainLossOnInvestmentsTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "GainLossOnInvestmentsTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Realized and Unrealized Gains (Losses) on Securities",
        "label": "Gain (Loss) on Securities [Table Text Block]",
        "documentation": "Tabular disclosure of realized and unrealized gain (loss) on investment in security."
       }
      }
     },
     "auth_ref": [
      "r962",
      "r963"
     ]
    },
    "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "GainLossOnSaleOfPropertyPlantEquipment",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 7.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Loss (gain) on disposal of fixed assets",
        "label": "Gain (Loss) on Disposition of Property Plant Equipment",
        "documentation": "Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property."
       }
      }
     },
     "auth_ref": [
      "r11"
     ]
    },
    "us-gaap_GeneralLiabilityMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "GeneralLiabilityMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "General liability",
        "label": "General Liability [Member]",
        "documentation": "Type of business insurance which provides insurance coverage for a wide variety of liability exposures including, but not limited to, contractual liability, product liability and personal injury liability."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_Goodwill": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "Goodwill",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 12.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Goodwill",
        "label": "Goodwill",
        "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."
       }
      }
     },
     "auth_ref": [
      "r167",
      "r351",
      "r602",
      "r821",
      "r842",
      "r1005",
      "r1006"
     ]
    },
    "us-gaap_HeldToMaturitySecurities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecurities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fixed income securities, held-to-maturity \u2013 at carrying value (fair value: $18,556 \u2013 2024; $21,923 \u2013 2023)",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss",
        "documentation": "Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity)."
       }
      }
     },
     "auth_ref": [
      "r153",
      "r296",
      "r331",
      "r996"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after five years through 10 years fair value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r132",
      "r141",
      "r311",
      "r615"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after five years through 10 years carrying value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r303",
      "r611"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after one year through five years fair value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r131",
      "r140",
      "r310",
      "r614"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after one year through five years carrying value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r302",
      "r610"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after 10 years fair value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r133",
      "r142",
      "r312",
      "r616"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due after 10 years carrying value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r304",
      "r612"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "HTM, Carrying Value",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "HTM, Fair Value",
        "label": "Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due in one year or less fair value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r130",
      "r139",
      "r309",
      "r613"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": "us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Due in one year or less carrying value, HTM",
        "label": "Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r301",
      "r609"
     ]
    },
    "us-gaap_HeldToMaturitySecuritiesFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "HeldToMaturitySecuritiesFairValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFixedIncomeSecuritiesbyContractualMaturityDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Fixed income securities, held-to-maturity, fair value",
        "totalLabel": "Total HTM fixed income securities, Fair Value",
        "verboseLabel": "Fixed income securities, held-to-maturity - fair value",
        "label": "Debt Securities, Held-to-Maturity, Fair Value",
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity)."
       }
      }
     },
     "auth_ref": [
      "r129",
      "r305",
      "r603",
      "r625"
     ]
    },
    "sigi_HomeownersMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "HomeownersMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Homeowners",
        "label": "Homeowners [Member]",
        "documentation": "Represents insurance coverage provided to policy holders on dwellings."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_IncomeAvailableToCommonStockholdersBeforeFederalIncomeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "IncomeAvailableToCommonStockholdersBeforeFederalIncomeTax",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Income (loss) available to common stockholders, before federal income tax",
        "label": "Income available to common stockholders, before federal income tax",
        "documentation": "Amount of income (loss) from continuing operations available to common stockholders, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "sigi_ComprehensiveIncomeLossBeforeTax",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Income (loss) before federal income tax",
        "terseLabel": "Income (loss), before federal income tax",
        "verboseLabel": "Net income (loss), Gross",
        "label": "Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest",
        "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."
       }
      }
     },
     "auth_ref": [
      "r0",
      "r93",
      "r119",
      "r252",
      "r266",
      "r272",
      "r275",
      "r607",
      "r642",
      "r815"
     ]
    },
    "us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Undistributed gains of equity method investments",
        "label": "Income (Loss) from Equity Method Investments, Net of Dividends or Distributions",
        "documentation": "This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities."
       }
      }
     },
     "auth_ref": [
      "r11"
     ]
    },
    "us-gaap_IncomeStatementAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeStatementAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Income Statement [Abstract]",
        "label": "Income Statement [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncomeStatementLocationAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeStatementLocationAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Income Statement Location [Axis]",
        "label": "Income Statement Location [Axis]",
        "documentation": "Information by location in the income statement."
       }
      }
     },
     "auth_ref": [
      "r361",
      "r363",
      "r761"
     ]
    },
    "us-gaap_IncomeStatementLocationDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeStatementLocationDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Income Statement Location [Domain]",
        "label": "Income Statement Location [Domain]",
        "documentation": "Location in the income statement."
       }
      }
     },
     "auth_ref": [
      "r363",
      "r761"
     ]
    },
    "us-gaap_IncomeTaxExpenseBenefit": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeTaxExpenseBenefit",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "sigi_ComprehensiveIncomeLossTax",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total federal income tax expense (benefit)",
        "verboseLabel": "Net income (loss), Tax",
        "negatedTerseLabel": "Total federal income tax expense (benefit)",
        "label": "Income Tax Expense (Benefit)",
        "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations."
       }
      }
     },
     "auth_ref": [
      "r150",
      "r156",
      "r223",
      "r224",
      "r260",
      "r498",
      "r504",
      "r654"
     ]
    },
    "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeTaxExpenseBenefitContinuingOperationsAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal income tax expense (benefit):",
        "label": "Income Tax Expense (Benefit), Continuing Operations [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncomeTaxReceivable": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeTaxReceivable",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 8.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current federal income tax",
        "label": "Income Taxes Receivable",
        "documentation": "Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable."
       }
      }
     },
     "auth_ref": [
      "r957"
     ]
    },
    "us-gaap_IncomeTaxesPaidNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncomeTaxesPaidNet",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal income tax",
        "label": "Income Taxes Paid, Net",
        "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."
       }
      }
     },
     "auth_ref": [
      "r43"
     ]
    },
    "us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInDeferredPolicyAcquisitionCosts",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 12.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Increase in deferred policy acquisition costs",
        "label": "Increase (Decrease) in Deferred Policy Acquisition Costs",
        "documentation": "The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInEmployeeRelatedLiabilities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 14.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Decrease in accrued salaries and benefits",
        "label": "Increase (Decrease) in Employee Related Liabilities",
        "documentation": "The increase (decrease) during the reporting period in the aggregate amount of obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "us-gaap_IncreaseDecreaseInIncomeTaxes": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInIncomeTaxes",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 10.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "(Increase) decrease in net federal income taxes",
        "label": "Increase (Decrease) in Income Taxes",
        "documentation": "The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets."
       }
      }
     },
     "auth_ref": [
      "r966"
     ]
    },
    "us-gaap_IncreaseDecreaseInInterestAndDividendsReceivable": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInInterestAndDividendsReceivable",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 13.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Increase in accrued investment income",
        "label": "Increase (Decrease) in Interest and Dividends Receivable",
        "documentation": "The increase (decrease) during the reporting period in the aggregate amount due to the entity in the form of unpaid interest and dividends."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Changes in assets and liabilities:",
        "label": "Increase (Decrease) in Operating Capital [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingAssets": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInOtherOperatingAssets",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 15.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Increase in other assets",
        "label": "Increase (Decrease) in Other Operating Assets",
        "documentation": "Amount of increase (decrease) in operating assets classified as other."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingLiabilities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInOtherOperatingLiabilities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 16.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Decrease in other liabilities",
        "label": "Increase (Decrease) in Other Operating Liabilities",
        "documentation": "Amount of increase (decrease) in operating liabilities classified as other."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "us-gaap_IncreaseDecreaseInPremiumsReceivable": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInPremiumsReceivable",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0,
       "order": 11.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Increase in premiums receivable",
        "label": "Increase (Decrease) in Premiums Receivable",
        "documentation": "The change in the premium receivable balance on the balance sheet."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "sigi_IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 8.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Increase in reserve for loss and loss expense, net of reinsurance recoverable",
        "label": "Increase decrease in reserves for losses and loss expenses, net of reinsurance recoverables",
        "documentation": "The net change during the reporting period in the reserve account established to account for expected losses net of reinsurance recoverables."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInStockholdersEquityRollForward",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
        "label": "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncreaseDecreaseInTemporaryEquityRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncreaseDecreaseInTemporaryEquityRollForward",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock, shares outstanding:",
        "label": "Increase (Decrease) in Temporary Equity [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 9.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Increase in unearned premiums, net of prepaid reinsurance",
        "label": "Increase Decrease In Unearned Premiums Net Of Prepaid Reinsurance",
        "documentation": "Change during the period in the unearned portion of premiums written, net of prepaid reinsurance. Premiums written are initially booked as unearned premiums and are recognized as revenue over the known or estimated life of the policy"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
     "calculation": {
      "http://www.selective.com/role/EarningsperCommonShareDetails": {
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Effect of dilutive securities - stock compensation plans (in shares)",
        "label": "Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements",
        "documentation": "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method."
       }
      }
     },
     "auth_ref": [
      "r232",
      "r233",
      "r234",
      "r240",
      "r466"
     ]
    },
    "us-gaap_IncurredClaimsPropertyCasualtyAndLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "IncurredClaimsPropertyCasualtyAndLiability",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Loss and loss expense incurred",
        "totalLabel": "Net",
        "verboseLabel": "Loss and loss expense incurred",
        "label": "Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability",
        "documentation": "Amount, after effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred for property and casualty insurance contracts."
       }
      }
     },
     "auth_ref": [
      "r1050"
     ]
    },
    "ecd_IndividualAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "IndividualAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure",
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure",
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements",
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Individual:",
        "label": "Individual [Axis]"
       }
      }
     },
     "auth_ref": [
      "r877",
      "r885",
      "r895",
      "r912",
      "r920",
      "r924",
      "r932"
     ]
    },
    "us-gaap_InformationByCategoryOfDebtSecurityAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InformationByCategoryOfDebtSecurityAxis",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Security Category [Axis]",
        "label": "Debt Security Category [Axis]",
        "documentation": "Information by category of debt security, either available-for-sale or held-to-maturity."
       }
      }
     },
     "auth_ref": []
    },
    "ecd_InsiderTradingArrLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "InsiderTradingArrLineItems",
     "lang": {
      "en-us": {
       "role": {
        "label": "Insider Trading Arrangements [Line Items]"
       }
      }
     },
     "auth_ref": [
      "r930"
     ]
    },
    "ecd_InsiderTradingPoliciesProcLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "InsiderTradingPoliciesProcLineItems",
     "lang": {
      "en-us": {
       "role": {
        "label": "Insider Trading Policies and Procedures [Line Items]"
       }
      }
     },
     "auth_ref": [
      "r866",
      "r936"
     ]
    },
    "ecd_InsiderTrdPoliciesProcAdoptedFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "InsiderTrdPoliciesProcAdoptedFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Insider Trading Policies and Procedures Adopted",
        "label": "Insider Trading Policies and Procedures Adopted [Flag]"
       }
      }
     },
     "auth_ref": [
      "r866",
      "r936"
     ]
    },
    "ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "InsiderTrdPoliciesProcNotAdoptedTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Insider Trading Policies and Procedures Not Adopted",
        "label": "Insider Trading Policies and Procedures Not Adopted [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r866",
      "r936"
     ]
    },
    "us-gaap_InsuranceLossReservesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InsuranceLossReservesAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Insurance Loss Reserves [Abstract]",
        "label": "Insurance Loss Reserves [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_InterestExpenseDebt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InterestExpenseDebt",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Interest expense",
        "negatedTerseLabel": "Interest expense",
        "label": "Interest Expense, Debt",
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense for debt."
       }
      }
     },
     "auth_ref": [
      "r98",
      "r381",
      "r383",
      "r824",
      "r825"
     ]
    },
    "us-gaap_InterestPaidNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InterestPaidNet",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Interest",
        "label": "Interest Paid, Excluding Capitalized Interest, Operating Activities",
        "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."
       }
      }
     },
     "auth_ref": [
      "r199",
      "r204",
      "r205"
     ]
    },
    "us-gaap_InvestmentIncomeExpenseMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentIncomeExpenseMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investment expenses",
        "label": "Investment Income (Expense) [Member]",
        "documentation": "Primary financial statement caption encompassing investment income (expense)."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_InvestmentIncomeInvestmentExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentIncomeInvestmentExpense",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Investment expenses",
        "label": "Investment Income, Investment Expense",
        "documentation": "Amount of expenses related to the generation of investment income."
       }
      }
     },
     "auth_ref": [
      "r99",
      "r859",
      "r1048"
     ]
    },
    "us-gaap_InvestmentIncomeTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentIncomeTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Pre-Tax Net Investment Income Earned",
        "label": "Investment Income [Table Text Block]",
        "documentation": "Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments."
       }
      }
     },
     "auth_ref": [
      "r96",
      "r98",
      "r99",
      "r1049"
     ]
    },
    "us-gaap_InvestmentTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentTextBlock",
     "presentation": [
      "http://www.selective.com/role/Investments"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investments",
        "label": "Investment [Text Block]",
        "documentation": "The entire disclosure for investment."
       }
      }
     },
     "auth_ref": [
      "r945",
      "r946",
      "r982"
     ]
    },
    "us-gaap_InvestmentTypeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentTypeAxis",
     "presentation": [
      "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails",
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investment Type [Axis]",
        "label": "Investment Type [Axis]",
        "documentation": "Information by type of investments."
       }
      }
     },
     "auth_ref": [
      "r719",
      "r720",
      "r721",
      "r722",
      "r723",
      "r780",
      "r782",
      "r784",
      "r787",
      "r788",
      "r789",
      "r790",
      "r798",
      "r799",
      "r800",
      "r801",
      "r802",
      "r849"
     ]
    },
    "us-gaap_InvestmentTypeCategorizationMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentTypeCategorizationMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsAccruedInvestmentIncomeNarrativeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails",
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investments [Domain]",
        "label": "Investments [Domain]",
        "documentation": "Asset obtained to generate income or appreciate in value."
       }
      }
     },
     "auth_ref": [
      "r719",
      "r720",
      "r721",
      "r722",
      "r723",
      "r780",
      "r782",
      "r784",
      "r787",
      "r788",
      "r789",
      "r790",
      "r798",
      "r799",
      "r800",
      "r801",
      "r802",
      "r849"
     ]
    },
    "us-gaap_Investments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "Investments",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total investments (Note 4 and 5)",
        "label": "Investments",
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all investments."
       }
      }
     },
     "auth_ref": [
      "r624"
     ]
    },
    "us-gaap_InvestmentsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentsAbstract",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investments:",
        "label": "Investments [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_InvestmentsAccountedForUnderTheEquityMethodMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "InvestmentsAccountedForUnderTheEquityMethodMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investments Accounted For Under The Equity Method",
        "label": "Investments Accounted For Under The Equity Method [Member]",
        "documentation": "Represents investments accounted for under the equity method."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Fixed Maturity Securities by Contractual Maturities",
        "label": "Investments Classified by Contractual Maturity Date [Table Text Block]",
        "documentation": "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_InvestmentsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "InvestmentsMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Investments",
        "terseLabel": "Investments Subtotal",
        "label": "Investments [Member]",
        "documentation": "Assets held for their financial return, rather than for the entity's operations."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_InvestmentsSIGIMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "InvestmentsSIGIMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investments",
        "label": "Investments SIGI [Member]",
        "documentation": "Represents the investment segment"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LegalMattersAndContingenciesTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LegalMattersAndContingenciesTextBlock",
     "presentation": [
      "http://www.selective.com/role/Litigation"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Litigation",
        "label": "Legal Matters and Contingencies [Text Block]",
        "documentation": "The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies."
       }
      }
     },
     "auth_ref": [
      "r108"
     ]
    },
    "us-gaap_Liabilities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "Liabilities",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total liabilities",
        "label": "Liabilities",
        "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."
       }
      }
     },
     "auth_ref": [
      "r28",
      "r207",
      "r318",
      "r370",
      "r371",
      "r372",
      "r373",
      "r374",
      "r375",
      "r376",
      "r377",
      "r378",
      "r509",
      "r512",
      "r513",
      "r545",
      "r733",
      "r814",
      "r861",
      "r1010",
      "r1026",
      "r1027"
     ]
    },
    "us-gaap_LiabilitiesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilitiesAbstract",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Liabilities:",
        "label": "Liabilities [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilitiesAndStockholdersEquity",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total liabilities and stockholders\u2019 equity",
        "label": "Liabilities and Equity",
        "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any."
       }
      }
     },
     "auth_ref": [
      "r89",
      "r118",
      "r636",
      "r842",
      "r970",
      "r995",
      "r1023"
     ]
    },
    "us-gaap_LiabilitiesAndStockholdersEquityAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilitiesAndStockholdersEquityAbstract",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "LIABILITIES AND STOCKHOLDERS\u2019 EQUITY",
        "label": "Liabilities and Equity [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForClaimsAndClaimsAdjustmentExpense",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Gross reserve for loss and loss expense, at beginning of period",
        "periodEndLabel": "Gross reserve for loss and loss expense, at end of period",
        "label": "Liability for Claims and Claims Adjustment Expense",
        "documentation": "The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date."
       }
      }
     },
     "auth_ref": [
      "r79",
      "r125"
     ]
    },
    "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reserve for loss and loss expense (Note 8)",
        "label": "Liability for Claims and Claims Adjustment Expense, Property-Casualty Liability",
        "documentation": "The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date."
       }
      }
     },
     "auth_ref": [
      "r1056",
      "r1057"
     ]
    },
    "us-gaap_LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpense"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reserve for Loss and Loss Expense",
        "label": "Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]",
        "documentation": "The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments."
       }
      }
     },
     "auth_ref": [
      "r677"
     ]
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Paid loss and loss expense for claims occurring in the:",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": "us-gaap_PaymentsForLossesAndLossAdjustmentExpense",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current year",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year",
        "documentation": "Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs."
       }
      }
     },
     "auth_ref": [
      "r21"
     ]
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": "us-gaap_PaymentsForLossesAndLossAdjustmentExpense",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Prior years",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years",
        "documentation": "Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs."
       }
      }
     },
     "auth_ref": [
      "r21"
     ]
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total incurred loss and loss expense",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims",
        "documentation": "Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process."
       }
      }
     },
     "auth_ref": [
      "r124"
     ]
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Incurred loss and loss expense for claims occurring in the:",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Net reserve for loss and loss expense, at beginning of period",
        "periodEndLabel": "Net reserve for loss and loss expense, at end of period",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Net",
        "documentation": "Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims."
       }
      }
     },
     "auth_ref": [
      "r79",
      "r125",
      "r1040"
     ]
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "dei_LocalPhoneNumber": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "LocalPhoneNumber",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Local Phone Number",
        "label": "Local Phone Number",
        "documentation": "Local phone number for entity."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligations": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LongTermDebtAndCapitalLeaseObligations",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Long-term debt",
        "label": "Long-Term Debt and Lease Obligation",
        "documentation": "Amount of long-term debt and lease obligation, classified as noncurrent."
       }
      }
     },
     "auth_ref": [
      "r27",
      "r629"
     ]
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Long-term debt",
        "label": "Long-Term Debt and Lease Obligation, Including Current Maturities",
        "documentation": "Amount of long-term debt and lease obligation, including portion classified as current."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_LongTermDebtExcludingIssuanceCostsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "LongTermDebtExcludingIssuanceCostsMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Subtotal long-term debt",
        "label": "Long Term Debt Excluding Issuance Costs [Member]",
        "documentation": "Debt arrangement having an initial term longer than one year or beyond the normal operating cycle, if longer excluding related debt issuance costs."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LongTermDebtFairValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LongTermDebtFairValue",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Long-term debt, fair value",
        "label": "Long-Term Debt, Fair Value",
        "documentation": "The fair value amount of long-term debt 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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_LongtermDebtTypeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LongtermDebtTypeAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Long-term Debt, Type [Axis]",
        "label": "Long-Term Debt, Type [Axis]",
        "documentation": "Information by type of long-term debt."
       }
      }
     },
     "auth_ref": [
      "r30"
     ]
    },
    "us-gaap_LongtermDebtTypeDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "LongtermDebtTypeDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Long-term Debt, Type [Domain]",
        "label": "Long-Term Debt, Type [Domain]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r30",
      "r56"
     ]
    },
    "sigi_LossesOnInvestmentSecuritiesForWhichWeHaveTheIntentToSell": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "LossesOnInvestmentSecuritiesForWhichWeHaveTheIntentToSell",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Losses on securities for which we have the intent to sell",
        "label": "Losses on investment securities for which we have the intent to sell",
        "documentation": "Losses on investment securities for which we have the intent to sell"
       }
      }
     },
     "auth_ref": []
    },
    "srt_MaximumMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "MaximumMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Maximum",
        "label": "Maximum [Member]"
       }
      }
     },
     "auth_ref": [
      "r366",
      "r367",
      "r368",
      "r369",
      "r464",
      "r597",
      "r679",
      "r724",
      "r725",
      "r781",
      "r783",
      "r785",
      "r786",
      "r791",
      "r808",
      "r809",
      "r816",
      "r826",
      "r838",
      "r844",
      "r1012",
      "r1028",
      "r1029",
      "r1030",
      "r1031",
      "r1032",
      "r1033"
     ]
    },
    "sigi_MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies": {
     "xbrltype": "percentItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies",
     "presentation": [
      "http://www.selective.com/role/InvestmentsCreditConcentrationRiskDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Maximum exposure to credit concentration risk of a single issuer of the Company's stockholder's equity, other than to certain U.S. government-backed investments",
        "label": "Maximum exposure to credit concentration risk of the Company's stockholder's equity other than certain U.S. government agencies",
        "documentation": "Maximum exposure to credit concentration risk of the Company's stockholder's equity other than certain U.S. government agencies"
       }
      }
     },
     "auth_ref": []
    },
    "ecd_MeasureAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "MeasureAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Measure:",
        "label": "Measure [Axis]"
       }
      }
     },
     "auth_ref": [
      "r904"
     ]
    },
    "ecd_MeasureName": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "MeasureName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Name",
        "label": "Measure Name"
       }
      }
     },
     "auth_ref": [
      "r904"
     ]
    },
    "us-gaap_MeasurementInputCreditSpreadMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "MeasurementInputCreditSpreadMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Illiquidity Spread",
        "label": "Measurement Input, Credit Spread [Member]",
        "documentation": "Measurement input using amount above (below) yield between two debt instruments similar in maturity, but different in credit quality."
       }
      }
     },
     "auth_ref": [
      "r1022"
     ]
    },
    "us-gaap_MeasurementInputTypeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "MeasurementInputTypeAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Measurement Input Type [Axis]",
        "label": "Measurement Input Type [Axis]",
        "documentation": "Information by type of measurement input used to determine value of asset and liability."
       }
      }
     },
     "auth_ref": [
      "r533"
     ]
    },
    "us-gaap_MeasurementInputTypeDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "MeasurementInputTypeDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Measurement Input Type [Domain]",
        "label": "Measurement Input Type [Domain]",
        "documentation": "Measurement input used to determine value of asset and liability."
       }
      }
     },
     "auth_ref": []
    },
    "srt_MinimumMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "MinimumMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Minimum",
        "label": "Minimum [Member]"
       }
      }
     },
     "auth_ref": [
      "r366",
      "r367",
      "r368",
      "r369",
      "r464",
      "r597",
      "r679",
      "r724",
      "r725",
      "r781",
      "r783",
      "r785",
      "r786",
      "r791",
      "r808",
      "r809",
      "r816",
      "r826",
      "r838",
      "r844",
      "r1012",
      "r1028",
      "r1029",
      "r1030",
      "r1031",
      "r1032",
      "r1033"
     ]
    },
    "sigi_MiscellaneousIncomeMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "MiscellaneousIncomeMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Miscellaneous income",
        "label": "Miscellaneous income [Member]",
        "documentation": "Represents miscellaneous income"
       }
      }
     },
     "auth_ref": []
    },
    "ecd_MnpiDiscTimedForCompValFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "MnpiDiscTimedForCompValFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "MNPI Disclosure Timed for Compensation Value",
        "label": "MNPI Disclosure Timed for Compensation Value [Flag]"
       }
      }
     },
     "auth_ref": [
      "r923"
     ]
    },
    "us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "MortgageLoansOnRealEstateCommercialAndConsumerNet",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Commercial mortgage loans, net of allowance for credit losses",
        "label": "Mortgage Loans on Real Estate, Commercial and Consumer, Net",
        "documentation": "The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio."
       }
      }
     },
     "auth_ref": [
      "r622"
     ]
    },
    "ecd_MtrlTermsOfTrdArrTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "MtrlTermsOfTrdArrTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Material Terms of Trading Arrangement",
        "label": "Material Terms of Trading Arrangement [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r931"
     ]
    },
    "ecd_NamedExecutiveOfficersFnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NamedExecutiveOfficersFnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Named Executive Officers, Footnote",
        "label": "Named Executive Officers, Footnote [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net cash provided by (used in) financing activities",
        "label": "Net Cash Provided by (Used in) Financing Activities",
        "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."
       }
      }
     },
     "auth_ref": [
      "r203"
     ]
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financing Activities",
        "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net cash provided by (used in) investing activities",
        "label": "Net Cash Provided by (Used in) Investing Activities",
        "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."
       }
      }
     },
     "auth_ref": [
      "r203"
     ]
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investing Activities",
        "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net cash provided by (used in) operating activities",
        "label": "Net Cash Provided by (Used in) Operating Activities",
        "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."
       }
      }
     },
     "auth_ref": [
      "r103",
      "r104",
      "r105"
     ]
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Operating Activities",
        "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_NetChangeInUnrealizedAppreciationDepreciationOfEquityMethodInvestees": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "NetChangeInUnrealizedAppreciationDepreciationOfEquityMethodInvestees",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails": {
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net change in unrealized appreciation (depreciation)",
        "label": "Net Change In Unrealized Appreciation Depreciation Of Equity Method Investees",
        "documentation": "This item represents the disclosure of summarized financial information, specifically the aggregate change in unrealized appreciation (depreciation), for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for under the equity method of accounting."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NetIncomeLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetIncomeLoss",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity",
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net income (loss)",
        "terseLabel": "Net income (loss)",
        "label": "Net Income (Loss) Attributable to Parent",
        "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent."
       }
      }
     },
     "auth_ref": [
      "r94",
      "r105",
      "r120",
      "r165",
      "r183",
      "r186",
      "r190",
      "r207",
      "r213",
      "r217",
      "r218",
      "r219",
      "r220",
      "r223",
      "r224",
      "r236",
      "r252",
      "r266",
      "r272",
      "r275",
      "r318",
      "r370",
      "r371",
      "r372",
      "r373",
      "r374",
      "r375",
      "r376",
      "r377",
      "r378",
      "r525",
      "r545",
      "r644",
      "r756",
      "r775",
      "r776",
      "r815",
      "r859",
      "r1010"
     ]
    },
    "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetIncomeLossAvailableToCommonStockholdersBasic",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net income (loss) available to common stockholders",
        "terseLabel": "Net income (loss) available to common stockholders:",
        "label": "Net Income (Loss) Available to Common Stockholders, Basic",
        "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders."
       }
      }
     },
     "auth_ref": [
      "r195",
      "r217",
      "r218",
      "r219",
      "r220",
      "r228",
      "r229",
      "r237",
      "r240",
      "r252",
      "r266",
      "r272",
      "r275",
      "r815"
     ]
    },
    "us-gaap_NetInvestmentIncome": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NetInvestmentIncome",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails": {
       "parentTag": "sigi_TotalInvestmentsRevenue",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net investment income earned",
        "label": "Net Investment Income",
        "documentation": "Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments."
       }
      }
     },
     "auth_ref": [
      "r152",
      "r647",
      "r648",
      "r762",
      "r859"
     ]
    },
    "sigi_NetInvestmentIncomeEarnedMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "NetInvestmentIncomeEarnedMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net investment income earned",
        "label": "Net Investment Income Earned [Member]",
        "documentation": "Represents the \"Net investment income earned\" financial statement line item."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_NetInvestmentIncomeOfEquityMethodInvestees": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "NetInvestmentIncomeOfEquityMethodInvestees",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails": {
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net investment income (loss)",
        "label": "Net Investment Income Of Equity Method Investees",
        "documentation": "This item represents the disclosure of summarized financial information, specifically aggregate net investment income, for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for under the equity method accounting."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
     "presentation": [
      "http://www.selective.com/role/AdoptionofAccountingPronouncements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adoption of Accounting Pronouncements",
        "label": "Accounting Standards Update and Change in Accounting Principle [Text Block]",
        "documentation": "The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle."
       }
      }
     },
     "auth_ref": [
      "r154",
      "r155",
      "r158",
      "r163",
      "r211",
      "r212",
      "r215",
      "r216",
      "r225",
      "r226",
      "r320",
      "r321",
      "r501",
      "r502",
      "r503",
      "r519",
      "r522",
      "r526",
      "r527",
      "r528",
      "r546",
      "r547",
      "r548",
      "r556",
      "r557",
      "r566",
      "r599",
      "r600",
      "r601",
      "r684",
      "r685",
      "r686",
      "r687",
      "r688"
     ]
    },
    "ecd_NonGaapMeasureDescriptionTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonGaapMeasureDescriptionTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-GAAP Measure Description",
        "label": "Non-GAAP Measure Description [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r904"
     ]
    },
    "ecd_NonNeosMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonNeosMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-NEOs",
        "label": "Non-NEOs [Member]"
       }
      }
     },
     "auth_ref": [
      "r874",
      "r885",
      "r895",
      "r912",
      "r920"
     ]
    },
    "ecd_NonPeoNeoAvgCompActuallyPaidAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonPeoNeoAvgCompActuallyPaidAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-PEO NEO Average Compensation Actually Paid Amount",
        "label": "Non-PEO NEO Average Compensation Actually Paid Amount"
       }
      }
     },
     "auth_ref": [
      "r902"
     ]
    },
    "ecd_NonPeoNeoAvgTotalCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonPeoNeoAvgTotalCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-PEO NEO Average Total Compensation Amount",
        "label": "Non-PEO NEO Average Total Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r901"
     ]
    },
    "ecd_NonPeoNeoMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonPeoNeoMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-PEO NEO",
        "label": "Non-PEO NEO [Member]"
       }
      }
     },
     "auth_ref": [
      "r912"
     ]
    },
    "sigi_NonRatedReinsurerAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "NonRatedReinsurerAxis",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non Rated Reinsurer [Axis]",
        "label": "Non Rated Reinsurer [Axis]",
        "documentation": "Reinsurers that are not rated by a rating agency."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_NonRatedReinsurerDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "NonRatedReinsurerDomain",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non Rated Reinsurer [Domain]",
        "label": "Non Rated Reinsurer [Domain]",
        "documentation": "[Domain] for Reinsurers that are not rated by AM Best Rating Agency"
       }
      }
     },
     "auth_ref": []
    },
    "ecd_NonRule10b51ArrAdoptedFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonRule10b51ArrAdoptedFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-Rule 10b5-1 Arrangement Adopted",
        "label": "Non-Rule 10b5-1 Arrangement Adopted [Flag]"
       }
      }
     },
     "auth_ref": [
      "r931"
     ]
    },
    "ecd_NonRule10b51ArrTrmntdFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "NonRule10b51ArrTrmntdFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-Rule 10b5-1 Arrangement Terminated",
        "label": "Non-Rule 10b5-1 Arrangement Terminated [Flag]"
       }
      }
     },
     "auth_ref": [
      "r931"
     ]
    },
    "us-gaap_NoncashInvestingAndFinancingItemsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NoncashInvestingAndFinancingItemsAbstract",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-cash items:",
        "label": "Noncash Investing and Financing Items [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Non-cash purchase of property and equipment",
        "label": "Noncash or Part Noncash Acquisition, Fixed Assets Acquired",
        "documentation": "The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period."
       }
      }
     },
     "auth_ref": [
      "r44",
      "r45",
      "r46"
     ]
    },
    "us-gaap_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NoncashOrPartNoncashAcquisitionInvestmentsAcquired1",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Corporate actions related to securities",
        "label": "Noncash or Part Noncash Acquisition, Investments Acquired",
        "documentation": "The amount of investments that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period."
       }
      }
     },
     "auth_ref": [
      "r44",
      "r45",
      "r46"
     ]
    },
    "us-gaap_NoncumulativePreferredStockMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NoncumulativePreferredStockMember",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Depositary Shares",
        "label": "Noncumulative Preferred Stock [Member]",
        "documentation": "Preferred stock upon which unpaid dividends do not accrue."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NonredeemablePreferredStockMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NonredeemablePreferredStockMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock",
        "label": "Nonredeemable Preferred Stock [Member]",
        "documentation": "Preferred shares that are not redeemable before liquidation of the entity. Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NotesReceivableGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NotesReceivableGross",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Commercial mortgage loans \u2013 at carrying value (fair value: $209,041 \u2013 2024 and $178,913 \u2013 2023)",
        "label": "Financing Receivable, before Allowance for Credit Loss",
        "documentation": "Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease."
       }
      }
     },
     "auth_ref": [
      "r153",
      "r160",
      "r161",
      "r174",
      "r331",
      "r334",
      "r818",
      "r819",
      "r954",
      "r996"
     ]
    },
    "sigi_NumberOfInsuranceSubsidiaries": {
     "xbrltype": "integerItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "NumberOfInsuranceSubsidiaries",
     "presentation": [
      "http://www.selective.com/role/LitigationDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Number of insurance subsidiaries",
        "label": "Number Of Insurance Subsidiaries",
        "documentation": "Number Of Insurance Subsidiaries"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_NumberOfReportableSegments": {
     "xbrltype": "integerItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "NumberOfReportableSegments",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Number of reportable segments",
        "label": "Number of Reportable Segments",
        "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."
       }
      }
     },
     "auth_ref": [
      "r977"
     ]
    },
    "sigi_OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesNetofTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesNetofTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
       "weight": 1.0,
       "order": 3.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net realized (gains) losses on disposals and losses on intent-to-sell available-for-sale securities",
        "totalLabel": "Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Net",
        "label": "OCI, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax",
        "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized amounts realized upon: (i) the disposal of; or (ii) the intent-to-sell write-down, of available-for-sale securities."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Tax",
        "label": "OCI, Reclassification Adjustment from AOCI for Write-down of Securities, Tax",
        "documentation": "Tax amount of reclassification adjustment from accumulated other comprehensive income for unrealized amounts realized upon: (i) the disposal of; or (ii) the intent-to-sell write-down, of available-for-sale securities."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesbeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesbeforeTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Gross",
        "label": "OCI, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax",
        "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized amounts realized upon: (i) the disposal of; or (ii) the intent-to-sell write-down, of available-for-sale securities."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_OCIReclassificationAdjustmentsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OCIReclassificationAdjustmentsAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amounts reclassified into net income (loss):",
        "label": "OCI, Reclassification Adjustments [Abstract]",
        "documentation": "OCI, Reclassification Adjustments"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OperatingCostsAndExpenses": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OperatingCostsAndExpenses",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Corporate expenses",
        "label": "Operating Costs and Expenses",
        "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. Excludes Selling, General and Administrative Expense."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OperatingLeasePayments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OperatingLeasePayments",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Operating cash flows from operating leases",
        "label": "Operating Lease, Payments",
        "documentation": "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use."
       }
      }
     },
     "auth_ref": [
      "r561",
      "r562"
     ]
    },
    "sigi_OperatingSegmentsSIGIMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OperatingSegmentsSIGIMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Operating Segments",
        "label": "Operating Segments SIGI [Member]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherAssets": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherAssets",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 13.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other assets",
        "label": "Other Assets",
        "documentation": "Amount of assets classified as other."
       }
      }
     },
     "auth_ref": [
      "r115",
      "r168",
      "r626",
      "r861"
     ]
    },
    "us-gaap_OtherAssetsFairValueDisclosure": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherAssetsFairValueDisclosure",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other investment assets measured at fair value",
        "label": "Other Assets, Fair Value Disclosure",
        "documentation": "Fair value portion of other assets."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_OtherCommercialMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OtherCommercialMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other",
        "label": "Other Commercial [Member]",
        "documentation": "Represents insurance coverage provided to policy holders on other commercial line policies."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized gains (losses) on investment securities:",
        "label": "Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParentAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParentAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Defined benefit pension and post-retirement plans:",
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherComprehensiveIncomeLocationAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLocationAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other Comprehensive Income Location [Axis]",
        "label": "Other Comprehensive Income Location [Axis]",
        "documentation": "Information by location in other comprehensive income."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherComprehensiveIncomeLocationDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLocationDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other Comprehensive Income Location [Domain]",
        "label": "Other Comprehensive Income Location [Domain]",
        "documentation": "Location in other comprehensive income."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "sigi_ComprehensiveIncomeLossBeforeTax",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total unrealized gains (losses) on investment securities, Gross",
        "label": "OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax",
        "documentation": "Amount, before tax and after 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."
       }
      }
     },
     "auth_ref": [
      "r176",
      "r177",
      "r179"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total unrealized gains (losses) on investment securities",
        "label": "OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax",
        "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."
       }
      }
     },
     "auth_ref": [
      "r176",
      "r177",
      "r179"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total unrealized gains (losses) on investment securities, Tax",
        "label": "OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax",
        "documentation": "Amount, after adjustment, of tax expense (benefit) for 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 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."
       }
      }
     },
     "auth_ref": [
      "r176",
      "r177",
      "r180"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Net actuarial losses, Net",
        "terseLabel": "OCI before reclassifications",
        "label": "Other Comprehensive Income (Loss), before Reclassifications, Net of Tax",
        "documentation": "Amount after tax, before reclassification adjustments of other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r26",
      "r35",
      "r189",
      "r549",
      "r552",
      "r555",
      "r959"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossBeforeTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Other comprehensive income (loss), Gross",
        "label": "Other Comprehensive Income (Loss), before Tax",
        "documentation": "Amount before tax, after reclassification adjustments of other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r192",
      "r549",
      "r550",
      "r555",
      "r604",
      "r645",
      "r959",
      "r960"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossNetOfTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Other comprehensive income (loss)",
        "verboseLabel": "Other comprehensive income (loss)",
        "terseLabel": "Net current period OCI",
        "label": "Other Comprehensive Income (Loss), Net of Tax",
        "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r26",
      "r184",
      "r187",
      "r192",
      "r549",
      "r550",
      "r555",
      "r604",
      "r645",
      "r959",
      "r960"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other comprehensive income (loss), net of tax:",
        "label": "Other Comprehensive Income (Loss), Net of Tax [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "sigi_ComprehensiveIncomeLossBeforeTax",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTotalLabel": "Total defined benefit pension and post-retirement plans, Gross",
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax",
        "documentation": "Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r4",
      "r92",
      "r830",
      "r1017"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": -1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTotalLabel": "Total defined benefit pension and post-retirement plans",
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax",
        "documentation": "Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r4",
      "r92"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "sigi_ComprehensiveIncomeLossTax",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTotalLabel": "Total defined benefit pension and post-retirement plans, Tax",
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax",
        "documentation": "Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r4",
      "r5",
      "r112"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Amount reclassified into net income (loss): Net actuarial (gain) loss, Gross",
        "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax",
        "documentation": "Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r7",
      "r92",
      "r182",
      "r435"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Amounts reclassified into net income (loss): Net actuarial loss",
        "negatedTotalLabel": "Amount reclassified into net income (loss): Net actuarial (gain) loss, Net",
        "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax",
        "documentation": "Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r7",
      "r92",
      "r182",
      "r435"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Amount reclassified into net income (loss): Net actuarial (gain) loss, Tax",
        "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax",
        "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan."
       }
      }
     },
     "auth_ref": [
      "r5"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeLossTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeLossTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Other comprehensive income (loss), Tax",
        "label": "Other Comprehensive Income (Loss), Tax",
        "documentation": "Amount of tax expense (benefit) allocated to other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r5",
      "r188",
      "r192",
      "r498",
      "r505",
      "r506",
      "r549",
      "r553",
      "r555",
      "r604",
      "r645"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other Comprehensive Income (Loss)",
        "label": "Other Comprehensive Income (Loss) [Member]",
        "documentation": "Primary financial statement caption in which reported facts about other comprehensive income have been included."
       }
      }
     },
     "auth_ref": [
      "r22"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized holding gains (losses) during the period, Gross",
        "label": "OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax",
        "documentation": "Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale."
       }
      }
     },
     "auth_ref": [
      "r176",
      "r179",
      "r314"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Unrealized holding gains (losses) arising during period",
        "totalLabel": "Unrealized holding gains (losses) during the period, Net",
        "label": "OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax",
        "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."
       }
      }
     },
     "auth_ref": [
      "r176",
      "r179",
      "r314"
     ]
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized holding gains (losses) during the period, Tax",
        "label": "OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax",
        "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."
       }
      }
     },
     "auth_ref": [
      "r5",
      "r177"
     ]
    },
    "sigi_OtherFederalAndStatePoolsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OtherFederalAndStatePoolsMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other than federal and state pools",
        "label": "Other Federal And State Pools [Member]",
        "documentation": "Represents federal and state pools not otherwise mentioned."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherGeneralExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherGeneralExpense",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Corporate expenses",
        "label": "Other General Expense",
        "documentation": "Amount of general expenses not normally included in Other Operating Costs and Expenses."
       }
      }
     },
     "auth_ref": [
      "r95"
     ]
    },
    "us-gaap_OtherIncome": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherIncome",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other income",
        "verboseLabel": "Miscellaneous income",
        "label": "Other Income",
        "documentation": "Amount of revenue and income classified as other."
       }
      }
     },
     "auth_ref": [
      "r652",
      "r758",
      "r795",
      "r796",
      "r797"
     ]
    },
    "sigi_OtherInvestmentPortfolioByStrategyAndRemainingCommitmentAmountAndMaximumExposureToLossAssociatedWithEachStrategyLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OtherInvestmentPortfolioByStrategyAndRemainingCommitmentAmountAndMaximumExposureToLossAssociatedWithEachStrategyLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]",
        "label": "Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]",
        "documentation": "Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_OtherInvestmentPortfolioByStrategyAndRemainingCommitmentAmountAndMaximumExposureToLossAssociatedWithEachStrategyTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OtherInvestmentPortfolioByStrategyAndRemainingCommitmentAmountAndMaximumExposureToLossAssociatedWithEachStrategyTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy",
        "label": "Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Table]",
        "documentation": "Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherInvestments",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 7.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other investments",
        "label": "Other Investments",
        "documentation": "Amount of investments classified as other."
       }
      }
     },
     "auth_ref": [
      "r956"
     ]
    },
    "us-gaap_OtherInvestmentsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherInvestmentsMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other investments",
        "label": "Other Investments [Member]",
        "documentation": "Primary financial statement caption encompassing other investments."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherLiabilities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherLiabilities",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other liabilities",
        "label": "Other Liabilities",
        "documentation": "Amount of liabilities classified as other."
       }
      }
     },
     "auth_ref": [
      "r75",
      "r621",
      "r729",
      "r730",
      "r861",
      "r1061"
     ]
    },
    "ecd_OtherPerfMeasureAmt": {
     "xbrltype": "decimalItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "OtherPerfMeasureAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other Performance Measure, Amount",
        "label": "Other Performance Measure, Amount"
       }
      }
     },
     "auth_ref": [
      "r904"
     ]
    },
    "sigi_OtherPersonalMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "OtherPersonalMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other",
        "label": "Other Personal [Member]",
        "documentation": "Represents insurance coverage provided to policy holders on other personal line policies."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_OtherShortTermInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherShortTermInvestments",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails": {
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0,
       "order": 3.0
      },
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Investments",
       "weight": 1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Short-term investments",
        "label": "Other Short-Term Investments",
        "documentation": "Amount of short-term investments classified as other."
       }
      }
     },
     "auth_ref": [
      "r77",
      "r623",
      "r958"
     ]
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain]",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain]",
        "documentation": "Provides the categories of debt securities, available-for-sale or held-to-maturity, on which an entity may recognize other than temporary impairments (OTTI) for which a portion related to credit losses has been recognized in earnings and a portion related to all other factors has been recognized in other comprehensive income."
       }
      }
     },
     "auth_ref": [
      "r25"
     ]
    },
    "us-gaap_OtherUnderwritingExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "OtherUnderwritingExpense",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Other insurance expenses",
        "terseLabel": "Other insurance expenses",
        "label": "Other Underwriting Expense",
        "documentation": "Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts."
       }
      }
     },
     "auth_ref": [
      "r80",
      "r1051"
     ]
    },
    "ecd_OutstandingAggtErrCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "OutstandingAggtErrCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Outstanding Aggregate Erroneous Compensation Amount",
        "label": "Outstanding Aggregate Erroneous Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r872",
      "r883",
      "r893",
      "r918"
     ]
    },
    "ecd_OutstandingRecoveryCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "OutstandingRecoveryCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Compensation Amount",
        "label": "Outstanding Recovery Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r875",
      "r886",
      "r896",
      "r921"
     ]
    },
    "ecd_OutstandingRecoveryIndName": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "OutstandingRecoveryIndName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Name",
        "label": "Outstanding Recovery, Individual Name"
       }
      }
     },
     "auth_ref": [
      "r875",
      "r886",
      "r896",
      "r921"
     ]
    },
    "srt_PartnershipInterestMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "PartnershipInterestMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails",
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Total alternative investments",
        "terseLabel": "Alternative investments",
        "label": "Partnership Interest [Member]"
       }
      }
     },
     "auth_ref": [
      "r849"
     ]
    },
    "ecd_PayVsPerformanceDisclosureLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PayVsPerformanceDisclosureLineItems",
     "lang": {
      "en-us": {
       "role": {
        "label": "Pay vs Performance Disclosure [Line Items]"
       }
      }
     },
     "auth_ref": [
      "r900"
     ]
    },
    "us-gaap_PaymentsForLossesAndLossAdjustmentExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsForLossesAndLossAdjustmentExpense",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total paid loss and loss expense",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid",
        "documentation": "Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process."
       }
      }
     },
     "auth_ref": [
      "r9",
      "r21"
     ]
    },
    "us-gaap_PaymentsForRepurchaseOfCommonStock": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsForRepurchaseOfCommonStock",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Acquisition of treasury stock",
        "label": "Payments for Repurchase of Common Stock",
        "documentation": "The cash outflow to reacquire common stock during the period."
       }
      }
     },
     "auth_ref": [
      "r41"
     ]
    },
    "us-gaap_PaymentsOfDividendsCommonStock": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsOfDividendsCommonStock",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Dividends to common stockholders",
        "label": "Payments of Ordinary Dividends, Common Stock",
        "documentation": "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity."
       }
      }
     },
     "auth_ref": [
      "r41"
     ]
    },
    "us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsOfDividendsPreferredStockAndPreferenceStock",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Dividends to preferred stockholders",
        "label": "Payments of Ordinary Dividends, Preferred Stock and Preference Stock",
        "documentation": "Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity."
       }
      }
     },
     "auth_ref": [
      "r41"
     ]
    },
    "us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsToAcquireAvailableForSaleSecuritiesDebt",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Purchases of fixed income securities, available-for-sale",
        "label": "Payments to Acquire Debt Securities, Available-for-Sale",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r40",
      "r196",
      "r282"
     ]
    },
    "us-gaap_PaymentsToAcquireEquitySecuritiesFvNi": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsToAcquireEquitySecuritiesFvNi",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Purchases of equity securities",
        "label": "Payments to Acquire Equity Securities, FV-NI",
        "documentation": "Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity."
       }
      }
     },
     "auth_ref": [
      "r148",
      "r200"
     ]
    },
    "us-gaap_PaymentsToAcquireMortgageNotesReceivable": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsToAcquireMortgageNotesReceivable",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Purchases of commercial mortgage loans",
        "label": "Payments to Acquire Mortgage Notes Receivable",
        "documentation": "The cash outflow from the purchase of receivables arising from the mortgage note on real estate."
       }
      }
     },
     "auth_ref": [
      "r40"
     ]
    },
    "us-gaap_PaymentsToAcquireOtherInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsToAcquireOtherInvestments",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Purchases of alternative investments and other investments",
        "label": "Payments to Acquire Other Investments",
        "documentation": "Amount of cash outflow to acquire investments classified as other."
       }
      }
     },
     "auth_ref": [
      "r101"
     ]
    },
    "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsToAcquirePropertyPlantAndEquipment",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0,
       "order": 14.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Purchases of property and equipment",
        "label": "Payments to Acquire Property, Plant, and Equipment",
        "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."
       }
      }
     },
     "auth_ref": [
      "r102"
     ]
    },
    "us-gaap_PaymentsToAcquireShortTermInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PaymentsToAcquireShortTermInvestments",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Purchases of short-term investments",
        "label": "Payments to Acquire Short-Term Investments",
        "documentation": "The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term."
       }
      }
     },
     "auth_ref": [
      "r101"
     ]
    },
    "ecd_PeerGroupIssuersFnTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PeerGroupIssuersFnTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Peer Group Issuers, Footnote",
        "label": "Peer Group Issuers, Footnote [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r903"
     ]
    },
    "ecd_PeerGroupTotalShareholderRtnAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PeerGroupTotalShareholderRtnAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Peer Group Total Shareholder Return Amount",
        "label": "Peer Group Total Shareholder Return Amount"
       }
      }
     },
     "auth_ref": [
      "r903"
     ]
    },
    "us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
     "presentation": [
      "http://www.selective.com/role/RetirementPlans"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Retirement Plans",
        "label": "Retirement Benefits [Text Block]",
        "documentation": "The entire disclosure for retirement benefits."
       }
      }
     },
     "auth_ref": [
      "r391",
      "r415",
      "r417",
      "r423",
      "r441",
      "r443",
      "r444",
      "r445",
      "r446",
      "r447",
      "r459",
      "r460",
      "r461",
      "r830"
     ]
    },
    "us-gaap_PensionPlansDefinedBenefitMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PensionPlansDefinedBenefitMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Defined benefit pension plan",
        "label": "Pension Plan [Member]",
        "documentation": "Plan designed to provide participant with pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes other postretirement benefits."
       }
      }
     },
     "auth_ref": [
      "r392",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r404",
      "r405",
      "r406",
      "r407",
      "r408",
      "r409",
      "r410",
      "r411",
      "r412",
      "r413",
      "r414",
      "r415",
      "r416",
      "r418",
      "r419",
      "r420",
      "r421",
      "r422",
      "r423",
      "r424",
      "r425",
      "r426",
      "r427",
      "r428",
      "r429",
      "r430",
      "r431",
      "r432",
      "r433",
      "r434",
      "r435",
      "r436",
      "r438",
      "r439",
      "r440",
      "r442",
      "r445",
      "r448",
      "r449",
      "r450",
      "r451",
      "r452",
      "r453",
      "r454",
      "r455",
      "r456",
      "r457",
      "r458",
      "r461",
      "r462",
      "r465",
      "r830",
      "r831",
      "r835",
      "r836",
      "r837"
     ]
    },
    "ecd_PeoActuallyPaidCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PeoActuallyPaidCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "PEO Actually Paid Compensation Amount",
        "label": "PEO Actually Paid Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r902"
     ]
    },
    "ecd_PeoMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PeoMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "PEO",
        "label": "PEO [Member]"
       }
      }
     },
     "auth_ref": [
      "r912"
     ]
    },
    "ecd_PeoName": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PeoName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "PEO Name",
        "label": "PEO Name"
       }
      }
     },
     "auth_ref": [
      "r905"
     ]
    },
    "ecd_PeoTotalCompAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PeoTotalCompAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "PEO Total Compensation Amount",
        "label": "PEO Total Compensation Amount"
       }
      }
     },
     "auth_ref": [
      "r901"
     ]
    },
    "sigi_PeriodchangeunrealizedgainslossesinOCI": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "PeriodchangeunrealizedgainslossesinOCI",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Change in unrealized gains (losses) for the period included in OCI for assets held at period end",
        "label": "Period change unrealized gains (losses) in OCI",
        "documentation": "Change in unrealized gains (losses) for the period included in comprehensive income for assets held at the end of the period."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_Periodchangeunrealizedgainslossesinearnings": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "Periodchangeunrealizedgainslossesinearnings",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Change in unrealized gains (losses) for the period included in earnings for assets held at period end",
        "label": "Period change unrealized gains (losses) in earnings",
        "documentation": "Change in unrealized gains (losses) for the period included in earnings for assets held at the end of the period."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_PersonalAutomobileMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "PersonalAutomobileMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Personal automobile",
        "label": "Personal Automobile [Member]",
        "documentation": "Represents insurance coverage provided to policy holders on personal automobiles."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PolicyholderBenefitsAndClaimsIncurredGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PolicyholderBenefitsAndClaimsIncurredGross",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_IncurredClaimsPropertyCasualtyAndLiability",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Direct",
        "label": "Policyholder Benefits and Claims Incurred, Direct",
        "documentation": "Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred."
       }
      }
     },
     "auth_ref": [
      "r1050"
     ]
    },
    "us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PolicyholderBenefitsAndClaimsIncurredNetAbstract",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Loss and loss expense incurred:",
        "label": "Policyholder Benefits and Claims Incurred, Net [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PortionAtFairValueFairValueDisclosureMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PortionAtFairValueFairValueDisclosureMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Portion at Fair Value Measurement",
        "label": "Portion at Fair Value Measurement [Member]",
        "documentation": "Measured at fair value for financial reporting purposes."
       }
      }
     },
     "auth_ref": [
      "r544"
     ]
    },
    "us-gaap_PreferredStockDividendsIncomeStatementImpact": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockDividendsIncomeStatementImpact",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock dividends",
        "negatedTerseLabel": "Preferred stock dividends",
        "label": "Preferred Stock Dividends, Income Statement Impact",
        "documentation": "The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PreferredStockDividendsPerShareDeclared": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockDividendsPerShareDeclared",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Dividends declared per preferred share (in dollars per share)",
        "label": "Preferred Stock, Dividends Per Share, Declared",
        "documentation": "Aggregate dividends declared during the period for each share of preferred stock outstanding."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PreferredStockLiquidationPreference": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockLiquidationPreference",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock, liquidation preference (in dollars per share)",
        "label": "Preferred Stock, Liquidation Preference Per Share",
        "documentation": "The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share."
       }
      }
     },
     "auth_ref": [
      "r57",
      "r58",
      "r83",
      "r969",
      "r1014"
     ]
    },
    "us-gaap_PreferredStockMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockMember",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock:",
        "label": "Preferred Stock [Member]",
        "documentation": "Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company."
       }
      }
     },
     "auth_ref": [
      "r847",
      "r848",
      "r852",
      "r853",
      "r854",
      "r855",
      "r1060",
      "r1062"
     ]
    },
    "us-gaap_PreferredStockParOrStatedValuePerShare": {
     "xbrltype": "perShareItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockParOrStatedValuePerShare",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock, par or stated value (in dollars per share)",
        "label": "Preferred Stock, Par or Stated Value Per Share",
        "documentation": "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer."
       }
      }
     },
     "auth_ref": [
      "r83",
      "r384"
     ]
    },
    "us-gaap_PreferredStockSharesAuthorized": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockSharesAuthorized",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock, authorized (in shares)",
        "label": "Preferred Stock, Shares Authorized",
        "documentation": "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws."
       }
      }
     },
     "auth_ref": [
      "r83",
      "r735"
     ]
    },
    "us-gaap_PreferredStockSharesIssued": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockSharesIssued",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock, issued (in shares)",
        "label": "Preferred Stock, Shares Issued",
        "documentation": "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt."
       }
      }
     },
     "auth_ref": [
      "r83",
      "r384"
     ]
    },
    "us-gaap_PreferredStockSharesOutstanding": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockSharesOutstanding",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Preferred stock, shares outstanding, beginning balance (in shares)",
        "periodEndLabel": "Preferred stock, shares outstanding, ending balance (in shares)",
        "label": "Preferred Stock, Shares Outstanding",
        "documentation": "Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased."
       }
      }
     },
     "auth_ref": [
      "r83",
      "r735",
      "r754",
      "r1062",
      "r1063"
     ]
    },
    "us-gaap_PreferredStockValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PreferredStockValue",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Preferred stock of $0 par value per share: Authorized shares 5,000,000; Issued shares: 8,000 with $25,000 liquidation preference per share - 2024 and 2023",
        "label": "Preferred Stock, Value, Issued",
        "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity."
       }
      }
     },
     "auth_ref": [
      "r83",
      "r632",
      "r842"
     ]
    },
    "us-gaap_PremiumReceivableAllowanceForCreditLossTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumReceivableAllowanceForCreditLossTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Allowance for Credit Losses on Premiums Receivable",
        "label": "Premium Receivable, Allowance for Credit Loss [Table Text Block]",
        "documentation": "Tabular disclosure of allowance for credit loss on premium receivable."
       }
      }
     },
     "auth_ref": [
      "r997"
     ]
    },
    "us-gaap_PremiumReceivableCreditLossExpenseReversal": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumReceivableCreditLossExpenseReversal",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current period change for expected credit losses",
        "label": "Premium Receivable, Credit Loss Expense (Reversal)",
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on premium receivable."
       }
      }
     },
     "auth_ref": [
      "r999"
     ]
    },
    "us-gaap_PremiumsEarnedNetPropertyAndCasualty": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsEarnedNetPropertyAndCasualty",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0,
       "order": 1.0
      },
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net premiums earned",
        "totalLabel": "Net",
        "verboseLabel": "Net premiums earned:",
        "label": "Premiums Earned, Net, Property and Casualty",
        "documentation": "Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned."
       }
      }
     },
     "auth_ref": [
      "r143",
      "r145",
      "r146",
      "r147"
     ]
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccounts",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_PremiumsReceivableAtCarryingValue",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableDetails",
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Less: allowance for credit losses (Note 6)",
        "periodStartLabel": "Balance at beginning of period",
        "periodEndLabel": "Allowance for credit losses, end of period",
        "label": "Premium Receivable, Allowance for Credit Loss",
        "documentation": "The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value."
       }
      }
     },
     "auth_ref": [
      "r942",
      "r980",
      "r998",
      "r1002",
      "r1046"
     ]
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccountsRecoveries",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Recoveries",
        "label": "Premium Receivable, Allowance for Credit Loss, Recovery",
        "documentation": "Amount of increase in allowance for credit loss on premium receivable from recovery."
       }
      }
     },
     "auth_ref": [
      "r1001"
     ]
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccountsRollForward",
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Premium Receivable, Allowance for Credit Loss [Roll Forward]",
        "label": "Premium Receivable, Allowance for Credit Loss [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/AllowanceforCreditLossesonPremiumsReceivableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Write-offs charged against the allowance for credit losses",
        "label": "Premium Receivable, Allowance for Credit Loss, Writeoff",
        "documentation": "Amount of writeoff of premium receivable, charged against allowance for credit loss."
       }
      }
     },
     "auth_ref": [
      "r978",
      "r1000"
     ]
    },
    "us-gaap_PremiumsReceivableAtCarryingValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableAtCarryingValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Premiums receivable, net of allowance for credit losses",
        "label": "Premiums Receivable, Net",
        "documentation": "The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts."
       }
      }
     },
     "auth_ref": [
      "r1043",
      "r1044",
      "r1045"
     ]
    },
    "us-gaap_PremiumsReceivableDisclosureAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableDisclosureAbstract",
     "lang": {
      "en-us": {
       "role": {
        "label": "Premiums Receivable Disclosure [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PremiumsReceivableGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsReceivableGross",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_PremiumsReceivableAtCarryingValue",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Premiums receivable",
        "label": "Premiums Receivable, Gross",
        "documentation": "Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts."
       }
      }
     },
     "auth_ref": [
      "r1046"
     ]
    },
    "us-gaap_PremiumsWrittenNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsWrittenNet",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net",
        "label": "Premiums Written, Net",
        "documentation": "Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written."
       }
      }
     },
     "auth_ref": [
      "r940",
      "r941"
     ]
    },
    "us-gaap_PremiumsWrittenNetConsolidatedAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PremiumsWrittenNetConsolidatedAbstract",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Premiums written:",
        "label": "Premiums Written, Net [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PrepaidReinsurancePremiums": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PrepaidReinsurancePremiums",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 7.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Prepaid reinsurance premiums",
        "label": "Prepaid Reinsurance Premiums",
        "documentation": "The unexpired portion of premiums ceded on policies in force as of the balance sheet date."
       }
      }
     },
     "auth_ref": [
      "r676",
      "r698"
     ]
    },
    "sigi_PrivateCreditFundsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "PrivateCreditFundsMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Private credit",
        "label": "Private Credit Funds [Member]",
        "documentation": "This strategy includes the Mezzanine Financing and Distressed Debt strategies, providing privately negotiated fixed income securities, generally with an equity component, to LBO firms and private and publicly traded large, mid and small-cap companies to finance LBOs, recapitalizations, and acquisitions, and making direct and indirect investments in debt and equity securities of companies that are experiencing financial and/or operational distress."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PrivateEquityFundsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PrivateEquityFundsMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Private equity",
        "label": "Private Equity Funds [Member]",
        "documentation": "Investments held in private equity funds."
       }
      }
     },
     "auth_ref": [
      "r1016"
     ]
    },
    "us-gaap_ProceedsFromDebtNetOfIssuanceCosts": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromDebtNetOfIssuanceCosts",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Proceeds from borrowings",
        "label": "Proceeds from Debt, Net of Issuance Costs",
        "documentation": "The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination."
       }
      }
     },
     "auth_ref": [
      "r198"
     ]
    },
    "us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 13.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Distributions from alternative investments and other investments",
        "label": "Proceeds from Equity Method Investment, Distribution, Return of Capital",
        "documentation": "Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities."
       }
      }
     },
     "auth_ref": [
      "r202",
      "r964"
     ]
    },
    "us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net proceeds from stock purchase and compensation plans",
        "label": "Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised",
        "documentation": "Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised."
       }
      }
     },
     "auth_ref": [
      "r6",
      "r20"
     ]
    },
    "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 10.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Redemption and maturities of fixed income securities, available-for-sale",
        "label": "Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r196",
      "r197",
      "r984"
     ]
    },
    "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 9.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Redemption and maturities of fixed income securities, held-to-maturity",
        "label": "Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities",
        "documentation": "The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity."
       }
      }
     },
     "auth_ref": [
      "r38",
      "r984"
     ]
    },
    "us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromSaleAndCollectionOfMortgageNotesReceivable",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 7.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Proceeds from commercial mortgage loans",
        "label": "Proceeds from Sale and Collection of Mortgage Notes Receivable",
        "documentation": "The cash inflow from proceeds from sale of receivables arising from the mortgage note on real estate; includes collections on mortgage notes receivable that are not classified as operating cash flows."
       }
      }
     },
     "auth_ref": [
      "r38"
     ]
    },
    "us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromSaleOfAvailableForSaleSecuritiesDebt",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Sales of fixed income securities, available-for-sale",
        "label": "Proceeds from Sale of Debt Securities, Available-for-Sale",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r38",
      "r196",
      "r282",
      "r313"
     ]
    },
    "us-gaap_ProceedsFromSaleOfEquityMethodInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromSaleOfEquityMethodInvestments",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 12.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Sales of other investments",
        "label": "Proceeds from Sale of Equity Method Investments",
        "documentation": "The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence."
       }
      }
     },
     "auth_ref": [
      "r39"
     ]
    },
    "us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromSaleOfEquitySecuritiesFvNi",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 11.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Sales of equity securities",
        "label": "Proceeds from Sale of Equity Securities, FV-NI",
        "documentation": "Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity."
       }
      }
     },
     "auth_ref": [
      "r148",
      "r200"
     ]
    },
    "us-gaap_ProceedsFromSaleOfShortTermInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProceedsFromSaleOfShortTermInvestments",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0,
       "order": 8.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Sales of short-term investments",
        "label": "Proceeds from Sale of Short-Term Investments",
        "documentation": "The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term."
       }
      }
     },
     "auth_ref": [
      "r37"
     ]
    },
    "sigi_Proceedsfromequityinvestmentsinexcessofcurrentyearearnings": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "Proceedsfromequityinvestmentsinexcessofcurrentyearearnings",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 5.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Distributions in excess of current year income of equity method investments",
        "label": "Proceeds from equity investments, in excess of current year earnings",
        "documentation": "Proceeds from equity investments, in excess of current year earnings"
       }
      }
     },
     "auth_ref": []
    },
    "srt_ProductOrServiceAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "ProductOrServiceAxis",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceNarrativeDetails",
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Product and Service [Axis]",
        "label": "Product and Service [Axis]"
       }
      }
     },
     "auth_ref": [
      "r277",
      "r598",
      "r666",
      "r667",
      "r668",
      "r669",
      "r670",
      "r671",
      "r810",
      "r827",
      "r843",
      "r943",
      "r1008",
      "r1009",
      "r1015",
      "r1052"
     ]
    },
    "srt_ProductsAndServicesDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "ProductsAndServicesDomain",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceNarrativeDetails",
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Product and Service [Domain]",
        "label": "Product and Service [Domain]"
       }
      }
     },
     "auth_ref": [
      "r277",
      "r598",
      "r666",
      "r667",
      "r668",
      "r669",
      "r670",
      "r671",
      "r810",
      "r827",
      "r843",
      "r943",
      "r1008",
      "r1009",
      "r1015",
      "r1052"
     ]
    },
    "us-gaap_ProfitLoss": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ProfitLoss",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Net income",
        "label": "Net Income (Loss), Including Portion Attributable to Noncontrolling Interest",
        "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest."
       }
      }
     },
     "auth_ref": [
      "r165",
      "r183",
      "r186",
      "r201",
      "r207",
      "r213",
      "r223",
      "r224",
      "r252",
      "r266",
      "r272",
      "r275",
      "r318",
      "r370",
      "r371",
      "r372",
      "r373",
      "r374",
      "r375",
      "r376",
      "r377",
      "r378",
      "r507",
      "r510",
      "r511",
      "r525",
      "r545",
      "r607",
      "r643",
      "r705",
      "r756",
      "r775",
      "r776",
      "r815",
      "r839",
      "r840",
      "r860",
      "r961",
      "r1010"
     ]
    },
    "sigi_PropertyInsuranceProductLine1Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "PropertyInsuranceProductLine1Member",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Property reserve",
        "label": "Property Insurance Product Line 1 [Member]",
        "documentation": "Property Insurance Product Line 1"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_PropertyInsuranceProductLineMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PropertyInsuranceProductLineMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Property lines",
        "label": "Property Insurance [Member]",
        "documentation": "Contract providing insurance coverage against damage to or theft of property."
       }
      }
     },
     "auth_ref": [
      "r1058"
     ]
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "PropertyPlantAndEquipmentNet",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 10.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Property and equipment \u2013 at cost, net of accumulated depreciation and amortization of: $278,525 \u2013 2024; $271,409 \u2013 2023",
        "label": "Property, Plant and Equipment, Net",
        "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."
       }
      }
     },
     "auth_ref": [
      "r12",
      "r617",
      "r641",
      "r842"
     ]
    },
    "ecd_PvpTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PvpTable",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Pay vs Performance Disclosure",
        "label": "Pay vs Performance Disclosure [Table]"
       }
      }
     },
     "auth_ref": [
      "r900"
     ]
    },
    "ecd_PvpTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "PvpTableTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Pay vs Performance Disclosure, Table",
        "label": "Pay vs Performance [Table Text Block]"
       }
      }
     },
     "auth_ref": [
      "r900"
     ]
    },
    "srt_RangeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "RangeAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statistical Measurement [Axis]",
        "label": "Statistical Measurement [Axis]"
       }
      }
     },
     "auth_ref": [
      "r366",
      "r367",
      "r368",
      "r369",
      "r415",
      "r464",
      "r489",
      "r490",
      "r491",
      "r573",
      "r597",
      "r679",
      "r724",
      "r725",
      "r781",
      "r783",
      "r785",
      "r786",
      "r791",
      "r808",
      "r809",
      "r816",
      "r826",
      "r838",
      "r844",
      "r849",
      "r1007",
      "r1012",
      "r1029",
      "r1030",
      "r1031",
      "r1032",
      "r1033"
     ]
    },
    "srt_RangeMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "RangeMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statistical Measurement [Domain]",
        "label": "Statistical Measurement [Domain]"
       }
      }
     },
     "auth_ref": [
      "r366",
      "r367",
      "r368",
      "r369",
      "r415",
      "r464",
      "r489",
      "r490",
      "r491",
      "r573",
      "r597",
      "r679",
      "r724",
      "r725",
      "r781",
      "r783",
      "r785",
      "r786",
      "r791",
      "r808",
      "r809",
      "r816",
      "r826",
      "r838",
      "r844",
      "r849",
      "r1007",
      "r1012",
      "r1029",
      "r1030",
      "r1031",
      "r1032",
      "r1033"
     ]
    },
    "sigi_RealAssetsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "RealAssetsMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Real assets",
        "label": "Real Assets [Member]",
        "documentation": "This strategy includes the Energy &amp; Power Generation and Real Estate strategies, making energy and power generation investments in cash flow generating infrastructure assets and investing opportunistically in real estate in North America, Europe, and Asia via direct property ownership, joint ventures, mortgages, and investments in equity and debt instruments."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_RealizedGainsLossesOfEquityMethodInvestees": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "RealizedGainsLossesOfEquityMethodInvestees",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails": {
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Realized gains",
        "label": "Realized Gains Losses Of Equity Method Investees",
        "documentation": "This item represents the disclosure of summarized financial information, specifically aggregate realized gains (losses), for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for under the equity method of accounting."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amounts reclassified from AOCI",
        "label": "Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent",
        "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent."
       }
      }
     },
     "auth_ref": [
      "r26",
      "r35"
     ]
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reclassification out of Accumulated Other Comprehensive Income [Axis]",
        "label": "Reclassification out of Accumulated Other Comprehensive Income [Axis]",
        "documentation": "Information by item reclassified out of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r190"
     ]
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reclassification out of Accumulated Other Comprehensive Income [Domain]",
        "label": "Reclassification out of Accumulated Other Comprehensive Income [Domain]",
        "documentation": "Item reclassified out of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r190"
     ]
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reclassification out of AOCI",
        "label": "Reclassification out of Accumulated Other Comprehensive Income [Member]",
        "documentation": "Identifies item reclassified out of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r190"
     ]
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reclassification Out Of Accumulated Other Comprehensive Income [Table]",
        "label": "Reclassification out of Accumulated Other Comprehensive Income [Table]",
        "documentation": "Disclosure of information about items reclassified out of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r190"
     ]
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reclassifications Out of Accumulated Other Comprehensive Income",
        "label": "Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]",
        "documentation": "Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table]",
        "label": "Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table]",
        "documentation": "Disclosure of information about the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment."
       }
      }
     },
     "auth_ref": [
      "r50",
      "r51"
     ]
    },
    "us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Reconciliation of Segment Results to Income (Loss) Before Federal Income Tax",
        "label": "Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]",
        "documentation": "Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment."
       }
      }
     },
     "auth_ref": [
      "r50",
      "r51"
     ]
    },
    "ecd_RecoveryOfErrCompDisclosureLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "RecoveryOfErrCompDisclosureLineItems",
     "lang": {
      "en-us": {
       "role": {
        "label": "Recovery of Erroneously Awarded Compensation Disclosure [Line Items]"
       }
      }
     },
     "auth_ref": [
      "r867",
      "r878",
      "r888",
      "r913"
     ]
    },
    "us-gaap_ReinsuranceDisclosuresAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceDisclosuresAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Disclosures [Abstract]",
        "label": "Reinsurance Disclosures [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_IncurredClaimsPropertyCasualtyAndLiability",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Assumed",
        "label": "Policyholder Benefits and Claims Incurred, Assumed",
        "documentation": "Amount of policy benefits and costs incurred for policies assumed."
       }
      }
     },
     "auth_ref": [
      "r1038",
      "r1050"
     ]
    },
    "us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails": {
       "parentTag": "us-gaap_IncurredClaimsPropertyCasualtyAndLiability",
       "weight": -1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Ceded",
        "label": "Policyholder Benefits and Claims Incurred, Ceded",
        "documentation": "Amount of reduction of provision for policy benefits and costs incurred for policies ceded."
       }
      }
     },
     "auth_ref": [
      "r1038",
      "r1050"
     ]
    },
    "us-gaap_ReinsuranceLossOnUncollectibleAccountsInPeriodAmount": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceLossOnUncollectibleAccountsInPeriodAmount",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofAllowanceforCreditLossesonReinsuranceRecoverableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Write-offs charged against the allowance for credit losses",
        "label": "Reinsurance, Loss on Uncollectible Accounts in Period, Amount",
        "documentation": "Amount of the write-down or write-off of a receivable from a reinsurer."
       }
      }
     },
     "auth_ref": [
      "r328"
     ]
    },
    "us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDirectAssumedandCededReinsuranceAmountsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Premiums earned:",
        "label": "Premiums Earned, Net [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRecovery": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableAllowanceForCreditLossRecovery",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofAllowanceforCreditLossesonReinsuranceRecoverableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Recoveries",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss, Recovery",
        "documentation": "Amount of increase in allowance for credit loss on reinsurance recoverable, from recovery."
       }
      }
     },
     "auth_ref": [
      "r329"
     ]
    },
    "us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableAllowanceForCreditLossRollForward",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofAllowanceforCreditLossesonReinsuranceRecoverableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]",
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Reinsurance Recoverable, Allowance for Credit Loss",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]",
        "documentation": "Tabular disclosure of allowance for credit loss on reinsurance recoverable."
       }
      }
     },
     "auth_ref": [
      "r997"
     ]
    },
    "sigi_ReinsuranceRecoverableAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ReinsuranceRecoverableAxis",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Recoverable [Axis]",
        "label": "Reinsurance Recoverable [Axis]",
        "documentation": "Reinsurance Recoverable [Axis]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReinsuranceRecoverableCreditLossExpenseReversal": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableCreditLossExpenseReversal",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofAllowanceforCreditLossesonReinsuranceRecoverableDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current period change for expected credit losses",
        "label": "Reinsurance Recoverable, Credit Loss Expense (Reversal)",
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable."
       }
      }
     },
     "auth_ref": [
      "r327"
     ]
    },
    "us-gaap_ReinsuranceRecoverableCreditQualityIndicatorLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableCreditQualityIndicatorLineItems",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Recoverable, Credit Quality Indicator [Line Items]",
        "label": "Reinsurance Recoverable, Credit Quality Indicator [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r1003"
     ]
    },
    "us-gaap_ReinsuranceRecoverableCreditQualityIndicatorTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableCreditQualityIndicatorTable",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Recoverable, Credit Quality Indicator [Table]",
        "label": "Reinsurance Recoverable, Credit Quality Indicator [Table]",
        "documentation": "Disclosure of information about credit quality indicator for reinsurance recoverable."
       }
      }
     },
     "auth_ref": [
      "r1003"
     ]
    },
    "us-gaap_ReinsuranceRecoverableCreditQualityIndicatorTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableCreditQualityIndicatorTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Reinsurance Recoverable, Credit Quality Indicator",
        "label": "Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]",
        "documentation": "Tabular disclosure of credit quality indicator for reinsurance recoverable."
       }
      }
     },
     "auth_ref": [
      "r1003"
     ]
    },
    "sigi_ReinsuranceRecoverableDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ReinsuranceRecoverableDomain",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Recoverable [Domain]",
        "label": "Reinsurance Recoverable [Domain]",
        "documentation": "[Domain] for Reinsurance Recoverable [Axis]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet",
       "weight": -1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "periodStartLabel": "Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period",
        "periodEndLabel": "Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period",
        "label": "Reinsurance Recoverable for Unpaid Claims and Claims Adjustments",
        "documentation": "Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer."
       }
      }
     },
     "auth_ref": [
      "r79",
      "r125",
      "r1039",
      "r1054",
      "r1055"
     ]
    },
    "sigi_ReinsuranceRecoverableforPaidandUnpaidClaimsandClaimsAdjustmentsGrossMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ReinsuranceRecoverableforPaidandUnpaidClaimsandClaimsAdjustmentsGrossMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross",
        "label": "Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross [Member]",
        "documentation": "Reinsurance recoverable for unpaid claims and claims adjustments prior to the unpaid claims allowance."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ReinsuranceRecoverablesAllowance": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverablesAllowance",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
       "weight": -1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/ReinsuranceScheduleofAllowanceforCreditLossesonReinsuranceRecoverableDetails",
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Less: allowance for credit losses (Note 7)",
        "negatedLabel": "Less: allowance for credit losses",
        "periodStartLabel": "Balance at beginning of period",
        "periodEndLabel": "Allowance for credit losses, end of period",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss",
        "documentation": "Amount of allowance for credit loss on reinsurance recoverable."
       }
      }
     },
     "auth_ref": [
      "r323",
      "r326",
      "r330",
      "r620",
      "r675"
     ]
    },
    "us-gaap_ReinsuranceRecoverablesGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverablesGross",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total reinsurance recoverable, gross",
        "label": "Reinsurance Recoverables, Gross",
        "documentation": "Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves."
       }
      }
     },
     "auth_ref": [
      "r153",
      "r331",
      "r620",
      "r638",
      "r675"
     ]
    },
    "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Reinsurance recoverable, net of allowance for credit losses",
        "terseLabel": "Total reinsurance recoverable, net",
        "label": "Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments",
        "documentation": "Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts."
       }
      }
     },
     "auth_ref": [
      "r697",
      "r1039",
      "r1053",
      "r1054",
      "r1055"
     ]
    },
    "us-gaap_ReinsuranceRecoverablesOnUnpaidLossesGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceRecoverablesOnUnpaidLossesGross",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance recoverable",
        "verboseLabel": "Total reinsurance recoverable, gross",
        "label": "Reinsurance Recoverables on Unpaid Losses, Gross",
        "documentation": "Amount before valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer."
       }
      }
     },
     "auth_ref": [
      "r1039",
      "r1054",
      "r1055"
     ]
    },
    "us-gaap_ReinsuranceTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ReinsuranceTextBlock",
     "presentation": [
      "http://www.selective.com/role/Reinsurance"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Reinsurance",
        "label": "Reinsurance [Text Block]",
        "documentation": "The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts."
       }
      }
     },
     "auth_ref": [
      "r618",
      "r619",
      "r845",
      "r846"
     ]
    },
    "sigi_RemainingCommitment": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "RemainingCommitment",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Remaining Commitment",
        "label": "Remaining Commitment",
        "documentation": "This item represents contractual obligations to invest additional amounts on our other investment portfolio. These additional investments may or may not be required."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_RepaymentsOfDebt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RepaymentsOfDebt",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Repayments of borrowings",
        "label": "Repayments of Debt",
        "documentation": "Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation."
       }
      }
     },
     "auth_ref": [
      "r965"
     ]
    },
    "us-gaap_ResidentialMortgageBackedSecuritiesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ResidentialMortgageBackedSecuritiesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Residential mortgage-backed securities (\"RMBS\")",
        "verboseLabel": "RMBS",
        "label": "Residential Mortgage-Backed Securities [Member]",
        "documentation": "Securities collateralized by residential real estate mortgage loans."
       }
      }
     },
     "auth_ref": [
      "r985",
      "r986",
      "r987",
      "r988",
      "r989",
      "r1016"
     ]
    },
    "ecd_RestatementDateAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "RestatementDateAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Restatement Determination Date:",
        "label": "Restatement Determination Date [Axis]"
       }
      }
     },
     "auth_ref": [
      "r868",
      "r879",
      "r889",
      "r914"
     ]
    },
    "ecd_RestatementDeterminationDate": {
     "xbrltype": "dateItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "RestatementDeterminationDate",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Restatement Determination Date",
        "label": "Restatement Determination Date"
       }
      }
     },
     "auth_ref": [
      "r869",
      "r880",
      "r890",
      "r915"
     ]
    },
    "ecd_RestatementDoesNotRequireRecoveryTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "RestatementDoesNotRequireRecoveryTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Restatement does not require Recovery",
        "label": "Restatement Does Not Require Recovery [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r876",
      "r887",
      "r897",
      "r922"
     ]
    },
    "us-gaap_RestrictedCash": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RestrictedCash",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails": {
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Assets",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashandRestrictedCashDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Restricted cash",
        "verboseLabel": "Restricted cash",
        "label": "Restricted Cash",
        "documentation": "Amount of cash restricted as to withdrawal or usage. 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."
       }
      }
     },
     "auth_ref": [
      "r955",
      "r968",
      "r1035",
      "r1042"
     ]
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RetainedEarningsAccumulatedDeficit",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Retained earnings",
        "label": "Retained Earnings (Accumulated Deficit)",
        "documentation": "Amount of accumulated undistributed earnings (deficit)."
       }
      }
     },
     "auth_ref": [
      "r86",
      "r109",
      "r635",
      "r684",
      "r688",
      "r704",
      "r736",
      "r842"
     ]
    },
    "us-gaap_RetainedEarningsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RetainedEarningsMember",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Retained earnings:",
        "label": "Retained Earnings [Member]",
        "documentation": "Accumulated undistributed earnings (deficit)."
       }
      }
     },
     "auth_ref": [
      "r162",
      "r208",
      "r209",
      "r210",
      "r214",
      "r222",
      "r224",
      "r319",
      "r322",
      "r493",
      "r494",
      "r495",
      "r499",
      "r500",
      "r514",
      "r516",
      "r517",
      "r520",
      "r523",
      "r680",
      "r682",
      "r706",
      "r1062"
     ]
    },
    "us-gaap_RetirementPlanTypeAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RetirementPlanTypeAxis",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Retirement Plan Type [Axis]",
        "label": "Retirement Plan Type [Axis]",
        "documentation": "Information by type of retirement benefit plan. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement."
       }
      }
     },
     "auth_ref": [
      "r392",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r404",
      "r405",
      "r406",
      "r407",
      "r408",
      "r409",
      "r410",
      "r411",
      "r412",
      "r413",
      "r414",
      "r415",
      "r416",
      "r418",
      "r419",
      "r420",
      "r421",
      "r422",
      "r423",
      "r424",
      "r425",
      "r426",
      "r427",
      "r428",
      "r429",
      "r430",
      "r431",
      "r432",
      "r433",
      "r434",
      "r435",
      "r436",
      "r438",
      "r439",
      "r440",
      "r442",
      "r445",
      "r448",
      "r449",
      "r450",
      "r451",
      "r452",
      "r453",
      "r454",
      "r455",
      "r456",
      "r457",
      "r458",
      "r461",
      "r462",
      "r463",
      "r465",
      "r830",
      "r831",
      "r832",
      "r833",
      "r834",
      "r835",
      "r836",
      "r837"
     ]
    },
    "us-gaap_RetirementPlanTypeDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RetirementPlanTypeDomain",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofComponentsofNetPeriodicBenefitCostDetails",
      "http://www.selective.com/role/RetirementPlansScheduleofWeightedAverageExpenseAssumptionsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Retirement Plan Type [Domain]",
        "label": "Retirement Plan Type [Domain]",
        "documentation": "Type of plan designed to provide participants with retirement benefits. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement."
       }
      }
     },
     "auth_ref": [
      "r392",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r404",
      "r405",
      "r406",
      "r407",
      "r408",
      "r409",
      "r410",
      "r411",
      "r412",
      "r413",
      "r414",
      "r415",
      "r416",
      "r418",
      "r419",
      "r420",
      "r421",
      "r422",
      "r423",
      "r424",
      "r425",
      "r426",
      "r427",
      "r428",
      "r429",
      "r430",
      "r431",
      "r432",
      "r433",
      "r434",
      "r435",
      "r436",
      "r438",
      "r439",
      "r440",
      "r442",
      "r445",
      "r448",
      "r449",
      "r450",
      "r451",
      "r452",
      "r453",
      "r454",
      "r455",
      "r456",
      "r457",
      "r458",
      "r461",
      "r462",
      "r463",
      "r465",
      "r830",
      "r831",
      "r832",
      "r833",
      "r834",
      "r835",
      "r836",
      "r837"
     ]
    },
    "sigi_ReturnonEquity": {
     "xbrltype": "percentItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ReturnonEquity",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "ROE contribution",
        "label": "ReturnonEquity",
        "documentation": "The after-tax income divided by average stockholders' equity."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_Revenues": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "Revenues",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome": {
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total revenues",
        "terseLabel": "Total revenues",
        "label": "Revenues",
        "documentation": "Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss)."
       }
      }
     },
     "auth_ref": [
      "r191",
      "r207",
      "r253",
      "r254",
      "r265",
      "r270",
      "r271",
      "r277",
      "r279",
      "r280",
      "r318",
      "r370",
      "r371",
      "r372",
      "r373",
      "r374",
      "r375",
      "r376",
      "r377",
      "r378",
      "r545",
      "r607",
      "r1010"
     ]
    },
    "us-gaap_RevenuesAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RevenuesAbstract",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofIncome"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Revenues:",
        "label": "Revenues [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Assets acquired under finance lease arrangements",
        "label": "Right-of-Use Asset Obtained in Exchange for Finance Lease Liability",
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for finance lease liability."
       }
      }
     },
     "auth_ref": [
      "r563",
      "r841"
     ]
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Assets acquired under operating lease arrangements",
        "label": "Right-of-Use Asset Obtained in Exchange for Operating Lease Liability",
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability."
       }
      }
     },
     "auth_ref": [
      "r563",
      "r841"
     ]
    },
    "ecd_Rule10b51ArrAdoptedFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "Rule10b51ArrAdoptedFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Rule 10b5-1 Arrangement Adopted",
        "label": "Rule 10b5-1 Arrangement Adopted [Flag]"
       }
      }
     },
     "auth_ref": [
      "r931"
     ]
    },
    "ecd_Rule10b51ArrTrmntdFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "Rule10b51ArrTrmntdFlag",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Rule 10b5-1 Arrangement Terminated",
        "label": "Rule 10b5-1 Arrangement Terminated [Flag]"
       }
      }
     },
     "auth_ref": [
      "r931"
     ]
    },
    "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Components of Accumulated Other Comprehensive Income Net of Tax",
        "label": "Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]",
        "documentation": "Tabular disclosure of the components of accumulated other comprehensive income (loss)."
       }
      }
     },
     "auth_ref": [
      "r35",
      "r1024",
      "r1025"
     ]
    },
    "sigi_ScheduleOfAggregatedSummarizedIncomeStatementFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ScheduleOfAggregatedSummarizedIncomeStatementFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Aggregated Summarized Income Statement Financial Information for Partnerships in Alternative Investment Portfolio",
        "label": "Schedule Of Aggregated Summarized Income Statement Financial Information For Partnerhips In Our Alternative Investment Portfolio [Table Text Block]",
        "documentation": "Schedule of aggregate summarized income statement information for alternative investments accounted for by the equity method."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_ScheduleOfAlternativeInvestmentPortfolioByStrategyRemainingCommitmentAmountAndMaximumExposureToLossAssociatedWithEachStrategyTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ScheduleOfAlternativeInvestmentPortfolioByStrategyRemainingCommitmentAmountAndMaximumExposureToLossAssociatedWithEachStrategyTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Alternative Investment Portfolio by Strategy and Remaining Commitment Amount and Maximum Exposure to Loss Associated with Each Strategy",
        "label": "Schedule Of Alternative Investment Portfolio By Strategy, Remaining Commitment Amount, and Maximum Exposure to Loss Associated With Each Strategy [Table Text Block]",
        "documentation": "Represents disclosure of information regarding the alternative investment portfolio, including carrying value, remaining commitments, and maximum exposure to loss broken out by strategy."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ScheduleOfAssumptionsUsedTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfAssumptionsUsedTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansTable"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Weighted-Average Expense Assumptions",
        "label": "Defined Benefit Plan, Assumptions [Table Text Block]",
        "documentation": "Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate."
       }
      }
     },
     "auth_ref": [
      "r437"
     ]
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfAvailableForSaleSecuritiesLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Securities, Available-for-sale [Line Items]",
        "label": "Debt Securities, Available-for-Sale [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r288",
      "r289",
      "r290",
      "r291",
      "r292",
      "r293",
      "r294"
     ]
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Available-for-Sale Securities",
        "label": "Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]",
        "documentation": "Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Carrying Values and Estimated Fair Values of Financial Liabilities",
        "label": "Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]",
        "documentation": "Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfCashAndCashEquivalentsTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Cash and Cash Equivalents",
        "label": "Schedule of Cash and Cash Equivalents [Table Text Block]",
        "documentation": "Tabular disclosure of the components of cash and cash equivalents."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Cash Flow, Supplemental Disclosures",
        "label": "Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]",
        "documentation": "Tabular disclosure of supplemental cash flow information for the periods presented."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfComprehensiveIncomeLossTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Components of Comprehensive Income-Gross and Net of Tax",
        "label": "Comprehensive Income (Loss) [Table Text Block]",
        "documentation": "Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans."
       }
      }
     },
     "auth_ref": [
      "r91"
     ]
    },
    "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Earnings Per Common Share, Basic and Diluted",
        "label": "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r976"
     ]
    },
    "us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Revenue from External Customers by Products and Services [Table]",
        "label": "Revenue from External Customers by Products and Services [Table]",
        "documentation": "Tabular presentation of the description and amount of revenues from a product or service, or a group of similar products or similar services, reported from external customers during the period, if the information is not provided as part of the reportable operating segment information."
       }
      }
     },
     "auth_ref": [
      "r52"
     ]
    },
    "us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Revenue By Segment",
        "label": "Revenue from External Customers by Products and Services [Table Text Block]",
        "documentation": "Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information."
       }
      }
     },
     "auth_ref": [
      "r52"
     ]
    },
    "us-gaap_ScheduleOfEquityMethodInvestmentsLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfEquityMethodInvestmentsLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Equity Method Investments [Line Items]",
        "label": "Schedule of Equity Method Investments [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r207",
      "r315",
      "r316",
      "r317",
      "r318",
      "r545"
     ]
    },
    "us-gaap_ScheduleOfEquityMethodInvestmentsTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfEquityMethodInvestmentsTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAggregatedIncomeStatementSummarizedFinancialInformationforPartnershipsinourAlternativeInvestmentPortfolioDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Equity Method Investments [Table]",
        "label": "Schedule of Equity Method Investments [Table]",
        "documentation": "Summarization of information required and determined to be disclosed concerning equity method investments in common stock. The summarized information includes: (a) the name of each investee or group of investees for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available."
       }
      }
     },
     "auth_ref": [
      "r165",
      "r207",
      "r315",
      "r316",
      "r317",
      "r318",
      "r545"
     ]
    },
    "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Fair Value of Financial Assets",
        "label": "Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]",
        "documentation": "Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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)."
       }
      }
     },
     "auth_ref": [
      "r531",
      "r532"
     ]
    },
    "us-gaap_ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Securities Pledged as Collateral",
        "label": "Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]",
        "documentation": "Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities."
       }
      }
     },
     "auth_ref": [
      "r113",
      "r1034"
     ]
    },
    "us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Gain (Loss) on Securities [Line Items]",
        "label": "Gain (Loss) on Securities [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r962",
      "r963",
      "r990"
     ]
    },
    "us-gaap_ScheduleOfGainLossOnInvestmentsTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfGainLossOnInvestmentsTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetRealizedandUnrealizedInvestmentGainsandLossesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of (Loss) Gain on Securities [Table]",
        "label": "Schedule of Gain (Loss) on Securities [Table]",
        "documentation": "Disclosure of information about realized and unrealized gain (loss) on investment in security."
       }
      }
     },
     "auth_ref": [
      "r962",
      "r963",
      "r990"
     ]
    },
    "us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Net Investment Income [Line Items]",
        "label": "Net Investment Income [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r646"
     ]
    },
    "us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Investment Income [Table]",
        "label": "Investment Income [Table]",
        "documentation": "Disclosure of information about investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments."
       }
      }
     },
     "auth_ref": [
      "r96",
      "r98",
      "r646"
     ]
    },
    "us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Roll Forward of Reserve for Loss and Loss Expense",
        "label": "Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]",
        "documentation": "Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims."
       }
      }
     },
     "auth_ref": [
      "r123"
     ]
    },
    "us-gaap_ScheduleOfNetBenefitCostsTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfNetBenefitCostsTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/RetirementPlansTable"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Components of Net Periodic Benefit Cost",
        "label": "Schedule of Net Benefit Costs [Table Text Block]",
        "documentation": "Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments."
       }
      }
     },
     "auth_ref": [
      "r110"
     ]
    },
    "us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Restrictions on Cash and Cash Equivalents",
        "label": "Restrictions on Cash and Cash Equivalents [Table Text Block]",
        "documentation": "Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage."
       }
      }
     },
     "auth_ref": [
      "r24",
      "r114",
      "r1042"
     ]
    },
    "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfSegmentReportingInformationBySegmentTable",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Segment Reporting Information, by Segment [Table]",
        "label": "Schedule of Segment Reporting Information, by Segment [Table]",
        "documentation": "A table disclosing the profit or loss and total assets for each reportable segment of the entity. 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."
       }
      }
     },
     "auth_ref": [
      "r47",
      "r48",
      "r49",
      "r54"
     ]
    },
    "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ScheduleOfSegmentReportingInformationBySegmentTextBlock",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Income (Loss) Before and After Federal Income Tax",
        "label": "Schedule of Segment Reporting Information, by Segment [Table Text Block]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r47",
      "r48",
      "r49",
      "r54"
     ]
    },
    "dei_Security12bTitle": {
     "xbrltype": "securityTitleItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "Security12bTitle",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Title of 12(b) Security",
        "label": "Title of 12(b) Security",
        "documentation": "Title of a 12(b) registered security."
       }
      }
     },
     "auth_ref": [
      "r862"
     ]
    },
    "dei_SecurityExchangeName": {
     "xbrltype": "edgarExchangeCodeItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "SecurityExchangeName",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Security Exchange Name",
        "label": "Security Exchange Name",
        "documentation": "Name of the Exchange on which a security is registered."
       }
      }
     },
     "auth_ref": [
      "r864"
     ]
    },
    "us-gaap_SegmentDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SegmentDomain",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Segment [Domain]",
        "label": "Segments [Domain]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r249",
      "r252",
      "r253",
      "r254",
      "r255",
      "r256",
      "r257",
      "r258",
      "r259",
      "r260",
      "r261",
      "r262",
      "r263",
      "r265",
      "r266",
      "r267",
      "r268",
      "r269",
      "r270",
      "r271",
      "r272",
      "r273",
      "r275",
      "r280",
      "r352",
      "r353",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r360",
      "r364",
      "r365",
      "r655",
      "r656",
      "r657",
      "r658",
      "r659",
      "r660",
      "r661",
      "r662",
      "r663",
      "r664",
      "r665",
      "r821",
      "r943",
      "r1052"
     ]
    },
    "us-gaap_SegmentReportingAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SegmentReportingAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Segment Reporting [Abstract]",
        "label": "Segment Reporting [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_SegmentReportingDisclosureTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SegmentReportingDisclosureTextBlock",
     "presentation": [
      "http://www.selective.com/role/SegmentInformation"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Segment Information",
        "label": "Segment Reporting Disclosure [Text Block]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r248",
      "r249",
      "r250",
      "r251",
      "r252",
      "r264",
      "r269",
      "r273",
      "r274",
      "r275",
      "r276",
      "r277",
      "r278",
      "r280"
     ]
    },
    "us-gaap_SegmentReportingInformationLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SegmentReportingInformationLineItems",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Segment Reporting Information [Line Items]",
        "label": "Segment Reporting Information [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]",
        "label": "Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_SevenPointTwentyFivePercentSeniorNotesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "SevenPointTwentyFivePercentSeniorNotesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "7.25% Senior Notes",
        "label": "Seven Point Twenty Five Percent Senior Notes [Member]",
        "documentation": "This item represents the 7.25% Senior Notes of the company due 2034."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ShareBasedCompensation": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ShareBasedCompensation",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows": {
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0,
       "order": 3.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofCashFlows"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Stock-based compensation expense",
        "label": "Share-Based Payment Arrangement, Noncash Expense",
        "documentation": "Amount of noncash expense for share-based payment arrangement."
       }
      }
     },
     "auth_ref": [
      "r10"
     ]
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "All Award Types",
        "label": "Award Type [Domain]",
        "documentation": "Award under share-based payment arrangement."
       }
      }
     },
     "auth_ref": [
      "r467",
      "r468",
      "r469",
      "r470",
      "r471",
      "r472",
      "r473",
      "r474",
      "r475",
      "r476",
      "r477",
      "r478",
      "r479",
      "r480",
      "r481",
      "r482",
      "r483",
      "r484",
      "r485",
      "r486",
      "r487",
      "r488",
      "r489",
      "r490",
      "r491",
      "r492"
     ]
    },
    "us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SharesPaidForTaxWithholdingForShareBasedCompensation",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedLabel": "Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)",
        "label": "Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation",
        "documentation": "Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ShortTermInvestmentsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ShortTermInvestmentsMember",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Short-term investments",
        "label": "Short-Term Investments [Member]",
        "documentation": "Investments which are not otherwise included in another category or item that the entity has the intent to sell or dispose of within one year from the date of the balance sheet."
       }
      }
     },
     "auth_ref": [
      "r800",
      "r801",
      "r802",
      "r811"
     ]
    },
    "sigi_SixPointSeventyPercentSeniorNotesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "SixPointSeventyPercentSeniorNotesMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "6.70% Senior Notes",
        "label": "Six Point Seventy Percent Senior Notes [Member]",
        "documentation": "This item represents the 6.70% Senior Notes of the company due 2035."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_StandardCommercialLinesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "StandardCommercialLinesMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Standard Commercial Lines",
        "label": "Standard Commercial Lines [Member]",
        "documentation": "This represents our Standard Commercial Lines of business."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_StandardPersonalLinesMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "StandardPersonalLinesMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Standard Personal Lines",
        "label": "Standard Personal Lines [Member]",
        "documentation": "This represents our Personal Lines segment of business."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_StatementBusinessSegmentsAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementBusinessSegmentsAxis",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Segments [Axis]",
        "label": "Segments [Axis]",
        "documentation": "Information by business segments."
       }
      }
     },
     "auth_ref": [
      "r164",
      "r249",
      "r252",
      "r253",
      "r254",
      "r255",
      "r256",
      "r257",
      "r258",
      "r259",
      "r260",
      "r261",
      "r262",
      "r263",
      "r265",
      "r266",
      "r267",
      "r268",
      "r269",
      "r270",
      "r271",
      "r272",
      "r273",
      "r275",
      "r280",
      "r352",
      "r353",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r360",
      "r362",
      "r364",
      "r365",
      "r655",
      "r656",
      "r657",
      "r658",
      "r659",
      "r660",
      "r661",
      "r662",
      "r663",
      "r664",
      "r665",
      "r821",
      "r943",
      "r1052"
     ]
    },
    "us-gaap_StatementClassOfStockAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementClassOfStockAxis",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Class of Stock [Axis]",
        "label": "Class of Stock [Axis]",
        "documentation": "Information by the different classes of stock of the entity."
       }
      }
     },
     "auth_ref": [
      "r159",
      "r171",
      "r172",
      "r173",
      "r207",
      "r231",
      "r235",
      "r238",
      "r240",
      "r246",
      "r247",
      "r318",
      "r370",
      "r372",
      "r373",
      "r374",
      "r377",
      "r378",
      "r384",
      "r385",
      "r386",
      "r387",
      "r389",
      "r545",
      "r700",
      "r701",
      "r702",
      "r703",
      "r706",
      "r707",
      "r708",
      "r709",
      "r710",
      "r711",
      "r712",
      "r713",
      "r714",
      "r715",
      "r716",
      "r718",
      "r735",
      "r757",
      "r777",
      "r803",
      "r804",
      "r805",
      "r806",
      "r807",
      "r939",
      "r969",
      "r975"
     ]
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementEquityComponentsAxis",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Equity Components [Axis]",
        "label": "Equity Components [Axis]",
        "documentation": "Information by component of equity."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r33",
      "r162",
      "r188",
      "r189",
      "r190",
      "r208",
      "r209",
      "r210",
      "r214",
      "r222",
      "r224",
      "r245",
      "r319",
      "r322",
      "r390",
      "r493",
      "r494",
      "r495",
      "r499",
      "r500",
      "r514",
      "r515",
      "r516",
      "r517",
      "r518",
      "r520",
      "r523",
      "r549",
      "r551",
      "r552",
      "r553",
      "r554",
      "r555",
      "r565",
      "r680",
      "r681",
      "r682",
      "r706",
      "r777"
     ]
    },
    "us-gaap_StatementLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementLineItems",
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofReclassificationoutofAOCIDetails",
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statement [Line Items]",
        "verboseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "label": "Statement [Line Items]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r208",
      "r209",
      "r210",
      "r245",
      "r598",
      "r699",
      "r718",
      "r726",
      "r728",
      "r729",
      "r730",
      "r731",
      "r732",
      "r735",
      "r738",
      "r739",
      "r740",
      "r741",
      "r742",
      "r744",
      "r745",
      "r746",
      "r747",
      "r749",
      "r750",
      "r751",
      "r752",
      "r753",
      "r755",
      "r759",
      "r760",
      "r763",
      "r764",
      "r765",
      "r766",
      "r767",
      "r768",
      "r769",
      "r770",
      "r771",
      "r772",
      "r773",
      "r774",
      "r777",
      "r851"
     ]
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementOfCashFlowsAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statement of Cash Flows [Abstract]",
        "label": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementOfFinancialPositionAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statement of Financial Position [Abstract]",
        "label": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statement of Comprehensive Income [Abstract]",
        "label": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementOfStockholdersEquityAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statement of Stockholders' Equity [Abstract]",
        "label": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_StatementTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StatementTable",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Statement [Table]",
        "label": "Statement [Table]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r208",
      "r209",
      "r210",
      "r245",
      "r598",
      "r699",
      "r718",
      "r726",
      "r728",
      "r729",
      "r730",
      "r731",
      "r732",
      "r735",
      "r738",
      "r739",
      "r740",
      "r741",
      "r742",
      "r744",
      "r745",
      "r746",
      "r747",
      "r749",
      "r750",
      "r751",
      "r752",
      "r753",
      "r755",
      "r759",
      "r760",
      "r763",
      "r764",
      "r765",
      "r766",
      "r767",
      "r768",
      "r769",
      "r770",
      "r771",
      "r772",
      "r773",
      "r774",
      "r777",
      "r851"
     ]
    },
    "ecd_StkPrcOrTsrEstimationMethodTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "StkPrcOrTsrEstimationMethodTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/ErrCompDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Stock Price or TSR Estimation Method",
        "label": "Stock Price or TSR Estimation Method [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r871",
      "r882",
      "r892",
      "r917"
     ]
    },
    "us-gaap_StockAppreciationRightsSARSMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockAppreciationRightsSARSMember",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Stock Appreciation Rights (SARs)",
        "label": "Stock Appreciation Rights (SARs) [Member]",
        "documentation": "Right to receive cash or shares equal to appreciation of predetermined number of grantor's shares during predetermined time period."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockIssuedDuringPeriodSharesDividendReinvestmentPlan",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Dividend reinvestment plan (in shares)",
        "label": "Stock Issued During Period, Shares, Dividend Reinvestment Plan",
        "documentation": "Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r777",
      "r805"
     ]
    },
    "us-gaap_StockIssuedDuringPeriodSharesNewIssues": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockIssuedDuringPeriodSharesNewIssues",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Issuance of preferred stock (in shares)",
        "label": "Stock Issued During Period, Shares, New Issues",
        "documentation": "Number of new stock issued during the period."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r83",
      "r84",
      "r109",
      "r700",
      "r777",
      "r804"
     ]
    },
    "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockIssuedDuringPeriodSharesShareBasedCompensation",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Stock purchase and compensation plan (in shares)",
        "label": "Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture",
        "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)."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r83",
      "r84",
      "r109"
     ]
    },
    "us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockIssuedDuringPeriodValueDividendReinvestmentPlan",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Dividend reinvestment plan",
        "label": "Stock Issued During Period, Value, Dividend Reinvestment Plan",
        "documentation": "Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r706",
      "r777",
      "r805",
      "r850",
      "r860"
     ]
    },
    "us-gaap_StockIssuedDuringPeriodValueNewIssues": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockIssuedDuringPeriodValueNewIssues",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Issuance of preferred stock",
        "label": "Stock Issued During Period, Value, New Issues",
        "documentation": "Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering."
       }
      }
     },
     "auth_ref": [
      "r17",
      "r83",
      "r84",
      "r109",
      "r706",
      "r777",
      "r804",
      "r860"
     ]
    },
    "us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockIssuedDuringPeriodValueShareBasedCompensation",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Stock purchase and compensation plans",
        "label": "Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture",
        "documentation": "Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP)."
       }
      }
     },
     "auth_ref": [
      "r65",
      "r83",
      "r84",
      "r109"
     ]
    },
    "us-gaap_StockholdersEquity": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockholdersEquity",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total stockholders\u2019 equity",
        "periodStartLabel": "Beginning of period",
        "periodEndLabel": "End of period",
        "label": "Equity, Attributable to Parent",
        "documentation": "Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest."
       }
      }
     },
     "auth_ref": [
      "r84",
      "r87",
      "r88",
      "r107",
      "r737",
      "r754",
      "r778",
      "r779",
      "r842",
      "r861",
      "r970",
      "r995",
      "r1023",
      "r1062"
     ]
    },
    "us-gaap_StockholdersEquityAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "StockholdersEquityAbstract",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Stockholders\u2019 Equity:",
        "label": "Equity, Attributable to Parent [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_SubsegmentsAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SubsegmentsAxis",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Subsegments [Axis]",
        "label": "Subsegments [Axis]",
        "documentation": "Information by business subsegments."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_SubsegmentsDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SubsegmentsDomain",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Subsegments [Domain]",
        "label": "Subsegments [Domain]",
        "documentation": "Divisions of a component 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."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_SupplementalCashFlowInformationAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SupplementalCashFlowInformationAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Supplemental Cash Flow Information [Abstract]",
        "label": "Supplemental Cash Flow Information [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_SupplementalCashFlowLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "SupplementalCashFlowLineItems",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Supplemental Cash Flow [Line Items]",
        "label": "Supplemental Cash Flow [Line Items]",
        "documentation": "Supplemental Cash Flow [Line Items]"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_SupplementalCashFlowTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "SupplementalCashFlowTable",
     "presentation": [
      "http://www.selective.com/role/StatementsofCashFlowsScheduleofCashFlowSupplementalDisclosuresDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Supplemental Cash Flow [Table]",
        "label": "Supplemental Cash Flow [Table]",
        "documentation": "Supplemental Cash Flow [Table]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Current year",
        "label": "Current Year Claims and Claims Adjustment Expense",
        "documentation": "Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs."
       }
      }
     },
     "auth_ref": [
      "r678"
     ]
    },
    "us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails": {
       "parentTag": "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ReinsuranceNarrativeDetails",
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails",
      "http://www.selective.com/role/ReserveforLossandLossExpenseScheduleofRollforwardofReserveforLossandLossExpenseDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "netLabel": "Effect in direct loss and loss expense incurred",
        "verboseLabel": "Prior years",
        "terseLabel": "Incurred loss and loss expense for claims occurring in the prior year",
        "label": "Prior Year Claims and Claims Adjustment Expense",
        "documentation": "Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs."
       }
      }
     },
     "auth_ref": [
      "r678"
     ]
    },
    "us-gaap_SuretySegmentMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "SuretySegmentMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Bonds",
        "label": "Surety Product Line [Member]",
        "documentation": "Contract providing insurance coverage for guarantee of performance."
       }
      }
     },
     "auth_ref": [
      "r1058"
     ]
    },
    "ecd_TabularListTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TabularListTableTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Tabular List, Table",
        "label": "Tabular List [Table Text Block]"
       }
      }
     },
     "auth_ref": [
      "r911"
     ]
    },
    "sigi_TaxOnInvestmentIncome": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "TaxOnInvestmentIncome",
     "crdr": "debit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Tax on investments segment income",
        "label": "Tax on Investment Income",
        "documentation": "Taxes incurred on investment income"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_ThreePointZeroThreePercentBorrowingFromFederalHomeLoanBankDueDecember162026Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "ThreePointZeroThreePercentBorrowingFromFederalHomeLoanBankDueDecember162026Member",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "3.03% borrowings from FHLBI",
        "label": "Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]",
        "documentation": "Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026"
       }
      }
     },
     "auth_ref": []
    },
    "sigi_TotalInvestmentSegmentIncomeAfterFederalIncomeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "TotalInvestmentSegmentIncomeAfterFederalIncomeTax",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total investments segment income, after federal income tax",
        "label": "Total Investment Segment Income After Federal Income Tax",
        "documentation": "The income earned from investments in securities and other investments including dividends, interest, and returns on other investments, including realized and unrealized gains/losses recognized in income, after-tax."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_TotalInvestmentsRevenue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "TotalInvestmentsRevenue",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Total Investments revenue",
        "terseLabel": "Total investments segment income, before federal income tax",
        "verboseLabel": "Investment income",
        "label": "Total Investments Revenue",
        "documentation": "The income earned from investments in securities and other investments including dividends, interest, and returns on other investments, including realized and unrealized gains/losses recognized in income."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_TotalNonRatedReinsurerMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "TotalNonRatedReinsurerMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total non-rated reinsurers",
        "label": "Total Non Rated Reinsurer [Member]",
        "documentation": "Total Non Rated Reinsurers rated by a rating agency."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_TotalSegmentIncomeLossFromContinuingOperationsBeforeFederalIncomeTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "TotalSegmentIncomeLossFromContinuingOperationsBeforeFederalIncomeTax",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total all segments",
        "label": "Total Segment Income Loss From Continuing Operations Before Federal Income Tax",
        "documentation": "Total of all reportable segments' income or loss from continuing operations, before federal income taxes."
       }
      }
     },
     "auth_ref": []
    },
    "ecd_TotalShareholderRtnAmt": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TotalShareholderRtnAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total Shareholder Return Amount",
        "label": "Total Shareholder Return Amount"
       }
      }
     },
     "auth_ref": [
      "r903"
     ]
    },
    "ecd_TotalShareholderRtnVsPeerGroupTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TotalShareholderRtnVsPeerGroupTextBlock",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/PvpDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Total Shareholder Return Vs Peer Group",
        "label": "Total Shareholder Return Vs Peer Group [Text Block]"
       }
      }
     },
     "auth_ref": [
      "r910"
     ]
    },
    "sigi_TotalfederalandstatepoolsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "TotalfederalandstatepoolsMember",
     "presentation": [
      "http://www.selective.com/role/ReinsuranceScheduleofDisaggregationofReinsuranceRecoverablebyFinancialStrengthRatingandAgingAnalysisDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Federal and state pools",
        "label": "Total federal and state pools [Member]",
        "documentation": "Total reinsurers included within the federal and state pools."
       }
      }
     },
     "auth_ref": []
    },
    "ecd_TradingArrAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TradingArrAxis",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Trading Arrangement:",
        "label": "Trading Arrangement [Axis]"
       }
      }
     },
     "auth_ref": [
      "r930"
     ]
    },
    "ecd_TradingArrByIndTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TradingArrByIndTable",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Trading Arrangements, by Individual",
        "label": "Trading Arrangements, by Individual [Table]"
       }
      }
     },
     "auth_ref": [
      "r932"
     ]
    },
    "dei_TradingSymbol": {
     "xbrltype": "tradingSymbolItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2023",
     "localname": "TradingSymbol",
     "presentation": [
      "http://www.selective.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Trading Symbol",
        "label": "Trading Symbol",
        "documentation": "Trading symbol of an instrument as listed on an exchange."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationofOurFinancialAssetsandLiabilitiesThatWereDisclosedatFairValueDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Financial Instruments [Domain]",
        "label": "Financial Instruments [Domain]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r283",
      "r284",
      "r285",
      "r286",
      "r287",
      "r288",
      "r289",
      "r290",
      "r291",
      "r292",
      "r293",
      "r294",
      "r295",
      "r296",
      "r297",
      "r298",
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r306",
      "r307",
      "r308",
      "r309",
      "r310",
      "r311",
      "r312",
      "r382",
      "r388",
      "r521",
      "r567",
      "r568",
      "r569",
      "r570",
      "r571",
      "r572",
      "r573",
      "r574",
      "r575",
      "r576",
      "r577",
      "r578",
      "r579",
      "r580",
      "r581",
      "r582",
      "r583",
      "r584",
      "r585",
      "r586",
      "r587",
      "r588",
      "r589",
      "r590",
      "r591",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r646",
      "r947",
      "r948",
      "r949",
      "r950",
      "r951",
      "r952",
      "r953",
      "r990",
      "r991",
      "r992",
      "r993"
     ]
    },
    "ecd_TrdArrAdoptionDate": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TrdArrAdoptionDate",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Adoption Date",
        "label": "Trading Arrangement Adoption Date"
       }
      }
     },
     "auth_ref": [
      "r933"
     ]
    },
    "ecd_TrdArrDuration": {
     "xbrltype": "durationItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TrdArrDuration",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Arrangement Duration",
        "label": "Trading Arrangement Duration"
       }
      }
     },
     "auth_ref": [
      "r934"
     ]
    },
    "ecd_TrdArrIndName": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TrdArrIndName",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Name",
        "label": "Trading Arrangement, Individual Name"
       }
      }
     },
     "auth_ref": [
      "r932"
     ]
    },
    "ecd_TrdArrIndTitle": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TrdArrIndTitle",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Title",
        "label": "Trading Arrangement, Individual Title"
       }
      }
     },
     "auth_ref": [
      "r932"
     ]
    },
    "ecd_TrdArrSecuritiesAggAvailAmt": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TrdArrSecuritiesAggAvailAmt",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Aggregate Available",
        "label": "Trading Arrangement, Securities Aggregate Available Amount"
       }
      }
     },
     "auth_ref": [
      "r935"
     ]
    },
    "ecd_TrdArrTerminationDate": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "TrdArrTerminationDate",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Termination Date",
        "label": "Trading Arrangement Termination Date"
       }
      }
     },
     "auth_ref": [
      "r933"
     ]
    },
    "us-gaap_TreasuryStockCommonMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "TreasuryStockCommonMember",
     "presentation": [
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofStockholdersEquity"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Treasury stock:",
        "label": "Treasury Stock, Common [Member]",
        "documentation": "Previously issued common shares repurchased by the issuing entity and held in treasury."
       }
      }
     },
     "auth_ref": [
      "r59"
     ]
    },
    "us-gaap_TreasuryStockCommonShares": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "TreasuryStockCommonShares",
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheetsParentheticals"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Treasury stock, common (in shares)",
        "label": "Treasury Stock, Common, Shares",
        "documentation": "Number of previously issued common shares repurchased by the issuing entity and held in treasury."
       }
      }
     },
     "auth_ref": [
      "r59"
     ]
    },
    "us-gaap_TreasuryStockValue": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "TreasuryStockValue",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": -1.0,
       "order": 6.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "negatedTerseLabel": "Treasury stock \u2013 at cost (shares:\u00a0 44,656,246 \u2013 2024; 44,586,870 \u2013 2023)",
        "label": "Treasury Stock, Value",
        "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."
       }
      }
     },
     "auth_ref": [
      "r32",
      "r59",
      "r60"
     ]
    },
    "us-gaap_USStatesAndPoliticalSubdivisionsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "USStatesAndPoliticalSubdivisionsMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/FairValueMeasurementsScheduleofChangesinFairValueofSecuritiesUsingLevel3InputsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableforSaleAllowanceforCreditLossesRollForwardDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Obligations of states and political subdivisions",
        "label": "US States and Political Subdivisions Debt Securities [Member]",
        "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."
       }
      }
     },
     "auth_ref": [
      "r828",
      "r1059"
     ]
    },
    "us-gaap_USTreasuryAndGovernmentMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "USTreasuryAndGovernmentMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsQuantitativeDisclosuresofFairValueAssetsDetails",
      "http://www.selective.com/role/InvestmentsScheduleofAvailableForSaleSecuritiesDisclosureDetails",
      "http://www.selective.com/role/InvestmentsScheduleofFairValueandGrossPreTaxNetUnrealizedLossofSecuritiesByLengthofTimeDetails",
      "http://www.selective.com/role/InvestmentsScheduleofInvestmentsPledgedasCollateralDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "U.S. government and government agencies",
        "terseLabel": "U.S. government and government agencies",
        "label": "US Treasury and Government [Member]",
        "documentation": "This category includes investments in debt securities issued by the United States Department of the Treasury, US Government Agencies and US Government-sponsored Enterprises. Such securities may include 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), debt securities issued by the Government National Mortgage Association (Ginnie Mae) and debt securities issued by the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac)."
       }
      }
     },
     "auth_ref": [
      "r608",
      "r828",
      "r1059"
     ]
    },
    "sigi_UnamortizedDebtIssuanceCostsMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnamortizedDebtIssuanceCostsMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofCarryingValuesandEstimatedFairValuesofFinancialLiabilitiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unamortized debt issuance costs",
        "label": "Unamortized Debt Issuance Costs [Member]",
        "documentation": "Unamortized debt issue costs associated with outstanding debt."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_UnderwritingIncomeLossAfterFederalIncomeTaxes": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnderwritingIncomeLossAfterFederalIncomeTaxes",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Underwriting income (loss), after federal income tax",
        "label": "Underwriting Income Loss After Federal Income Taxes",
        "documentation": "After-tax amount of net premiums earned and other insurance income less net loss and loss expenses incurred, loss adjustment expenses, policy acquisition costs and other underwriting expenses."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnderwritingIncomeLossBeforeFederalIncomeTaxes",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofIncomeLossBeforeandAfterFederalIncomeTaxDetails",
      "http://www.selective.com/role/SegmentInformationScheduleofReconciliationofSegmentResultstoIncomeLossBeforeFederalIncomeTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Underwriting income (loss), before federal income tax",
        "verboseLabel": "Underwriting income (loss)",
        "label": "Underwriting Income Loss Before Federal Income Taxes",
        "documentation": "Net premiums earned and other insurance income less net loss and loss expenses incurred, loss adjustment expenses, policy acquisition costs and other underwriting expenses."
       }
      }
     },
     "auth_ref": []
    },
    "ecd_UndrlygSecurityMktPriceChngPct": {
     "xbrltype": "pureItemType",
     "nsuri": "http://xbrl.sec.gov/ecd/2023",
     "localname": "UndrlygSecurityMktPriceChngPct",
     "presentation": [
      "http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Underlying Security Market Price Change",
        "label": "Underlying Security Market Price Change, Percent"
       }
      }
     },
     "auth_ref": [
      "r929"
     ]
    },
    "us-gaap_UnearnedPremiums": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "UnearnedPremiums",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ConsolidatedBalanceSheets": {
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ConsolidatedBalanceSheets"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unearned premiums",
        "label": "Unearned Premiums",
        "documentation": "Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date."
       }
      }
     },
     "auth_ref": [
      "r157"
     ]
    },
    "us-gaap_UnrealizedGainLossOnInvestments": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "UnrealizedGainLossOnInvestments",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofRealizedandUnrealizedGainsLossesonEquitySecuritiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized gains (losses) recognized in income on equity securities remaining in our portfolio at end of period",
        "label": "Unrealized Gain (Loss) on Investments",
        "documentation": "Amount of unrealized gain (loss) on investment."
       }
      }
     },
     "auth_ref": [
      "r11"
     ]
    },
    "sigi_UnrealizedGainLossOnSecuritiesTableTextBlock": {
     "xbrltype": "textBlockItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnrealizedGainLossOnSecuritiesTableTextBlock",
     "presentation": [
      "http://www.selective.com/role/InvestmentsTables"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Schedule of Unrealized Gain (Loss) on Equity Securities",
        "label": "Unrealized Gain (Loss) on Securities [Table Text Block]",
        "documentation": "Tabular disclosure that provides unrealized gains or losses recognized in income on equity securities separated by: (i) securities that continue to be held; and (ii) securities that were sold."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_UnrealizedGainLossonEquitySecuritiesSold": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnrealizedGainLossonEquitySecuritiesSold",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofRealizedandUnrealizedGainsLossesonEquitySecuritiesDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Unrealized gains (losses) recognized in income on equity securities sold in period",
        "label": "Unrealized Gain Loss on Equity Securities Sold",
        "documentation": "The unrealized gains (losses) on equity securities sold during the period."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_UnrealizedGainsLossesOnSecuritiesWithCreditLossRecognizedInEarningsGross": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnrealizedGainsLossesOnSecuritiesWithCreditLossRecognizedInEarningsGross",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax",
       "weight": 1.0,
       "order": 2.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized gains (losses) on securities with credit loss recognized in earnings, Gross",
        "label": "Unrealized gains (losses) on securities with credit loss recognized in earnings, Gross",
        "documentation": "Amount, before tax and before reclassification adjustment, of unrealized holding gain (loss) on investments in debt securities having credit losses recognized in the consolidated statement of income, and includes non-credit changes on debt securities currently having credit losses."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_UnrealizedGainsLossesOnSecuritiesWithCreditLossRecognizedInEarningsNet": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnrealizedGainsLossesOnSecuritiesWithCreditLossRecognizedInEarningsNet",
     "crdr": "credit",
     "calculation": {
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
       "weight": 1.0,
       "order": 2.0
      },
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails",
      "http://www.selective.com/role/UnauditedConsolidatedStatementsofComprehensiveIncomeLoss"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized gains (losses) on securities with credit loss recognized in earnings",
        "totalLabel": "Unrealized gains (losses) on securities with credit loss recognized in earnings, Net",
        "label": "Unrealized gains (losses) on securities with credit loss recognized in earnings, Net",
        "documentation": "Amount, after tax and before reclassification adjustment, of unrealized holding gain (loss) on investments in debt securities having credit losses recognized in the consolidated statement of income, and includes non-credit changes on debt securities currently having credit losses."
       }
      }
     },
     "auth_ref": []
    },
    "sigi_UnrealizedGainsLossesOnSecuritiesWithCreditLossRecognizedInEarningsTax": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "UnrealizedGainsLossesOnSecuritiesWithCreditLossRecognizedInEarningsTax",
     "crdr": "debit",
     "calculation": {
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails": {
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax",
       "weight": 1.0,
       "order": 4.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/ComprehensiveIncomeLossScheduleofComponentsofComprehensiveIncomeGrossandNetofTaxDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Unrealized gains (losses) on securities with credit loss recognized in earnings, Tax",
        "label": "Unrealized gains (losses) on securities with credit loss recognized in earnings, Tax",
        "documentation": "Tax effect, before reclassification adjustment, of unrealized holding gain (loss) on investments in debt securities having credit losses recognized in the consolidated statement of income, and includes non-credit changes on debt securities currently having credit losses."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_ValuationTechniqueAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ValuationTechniqueAxis",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Valuation Approach and Technique [Axis]",
        "label": "Valuation Approach and Technique [Axis]",
        "documentation": "Information by valuation approach and technique."
       }
      }
     },
     "auth_ref": [
      "r18"
     ]
    },
    "us-gaap_ValuationTechniqueDiscountedCashFlowMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ValuationTechniqueDiscountedCashFlowMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Valuation Technique, Discounted Cash Flow",
        "label": "Valuation Technique, Discounted Cash Flow [Member]",
        "documentation": "Valuation technique calculating present value of future cash flows."
       }
      }
     },
     "auth_ref": [
      "r1022"
     ]
    },
    "us-gaap_ValuationTechniqueDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "ValuationTechniqueDomain",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Valuation Approach and Technique [Domain]",
        "label": "Valuation Approach and Technique [Domain]",
        "documentation": "Valuation approach and technique."
       }
      }
     },
     "auth_ref": [
      "r18"
     ]
    },
    "us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount": {
     "xbrltype": "monetaryItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "VariableInterestEntityEntityMaximumLossExposureAmount",
     "crdr": "credit",
     "presentation": [
      "http://www.selective.com/role/InvestmentsScheduleofAlternativeInvestmentPortfoliobyStrategyandtheRemainingCommitmentAmountandMaximumExposuretoLossAssociatedWithEachStrategyDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Maximum Exposure to Loss",
        "label": "Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount",
        "documentation": "The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE)."
       }
      }
     },
     "auth_ref": [
      "r66",
      "r67"
     ]
    },
    "srt_WeightedAverageMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/srt/2023",
     "localname": "WeightedAverageMember",
     "presentation": [
      "http://www.selective.com/role/FairValueMeasurementsScheduleofQuantitativeInformationaboutSignificantUnobservableInputsintheFairValueMeasurementofLevel3AssetsDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Weighted Average",
        "label": "Weighted Average [Member]"
       }
      }
     },
     "auth_ref": [
      "r808",
      "r809",
      "r1028",
      "r1030",
      "r1033"
     ]
    },
    "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "WeightedAverageNumberOfDilutedSharesOutstanding",
     "calculation": {
      "http://www.selective.com/role/EarningsperCommonShareDetails": {
       "parentTag": null,
       "weight": null,
       "order": null,
       "root": true
      }
     },
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "totalLabel": "Weighted average common shares outstanding - diluted (in shares)",
        "label": "Weighted Average Number of Shares Outstanding, Diluted",
        "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."
       }
      }
     },
     "auth_ref": [
      "r230",
      "r240"
     ]
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "WeightedAverageNumberOfSharesOutstandingAbstract",
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Weighted average common shares outstanding:",
        "label": "Weighted Average Number of Shares Outstanding, Diluted [Abstract]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": {
     "xbrltype": "sharesItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "WeightedAverageNumberOfSharesOutstandingBasic",
     "calculation": {
      "http://www.selective.com/role/EarningsperCommonShareDetails": {
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0,
       "order": 1.0
      }
     },
     "presentation": [
      "http://www.selective.com/role/EarningsperCommonShareDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Weighted average common shares outstanding - basic (in shares)",
        "label": "Weighted Average Number of Shares Outstanding, Basic",
        "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."
       }
      }
     },
     "auth_ref": [
      "r228",
      "r240"
     ]
    },
    "us-gaap_WorkersCompensationInsuranceMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2023",
     "localname": "WorkersCompensationInsuranceMember",
     "presentation": [
      "http://www.selective.com/role/ReserveforLossandLossExpenseNarrativeDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "verboseLabel": "Workers' compensation",
        "label": "Workers' Compensation Insurance [Member]",
        "documentation": "Contract providing insurance coverage for employer's liability related to injury, disability, or death."
       }
      }
     },
     "auth_ref": [
      "r1058"
     ]
    },
    "sigi_WorkersCompensationMember": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.selective.com/20240630",
     "localname": "WorkersCompensationMember",
     "presentation": [
      "http://www.selective.com/role/SegmentInformationScheduleofRevenuebySegmentDetails"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Workers compensation",
        "label": "Workers Compensation [Member]",
        "documentation": "Represents insurance coverage provided to policy holders for workers compensation."
       }
      }
     },
     "auth_ref": []
    }
   }
  }
 },
 "std_ref": {
  "r0": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "25",
   "Paragraph": "1",
   "SubTopic": "20",
   "Topic": "940",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481913/940-20-25-1"
  },
  "r1": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "SubTopic": "230",
   "Topic": "830",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481877/830-230-45-1"
  },
  "r2": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10A",
   "SubTopic": "10",
   "Topic": "220",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-10A"
  },
  "r3": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10A",
   "Subparagraph": "(i),(j),(k)",
   "SubTopic": "10",
   "Topic": "220",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-10A"
  },
  "r4": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10A",
   "Subparagraph": "(i-k)",
   "SubTopic": "10",
   "Topic": "220",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-10A"
  },
  "r5": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "12",
   "SubTopic": "10",
   "Topic": "220",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-12"
  },
  "r6": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "14",
   "Subparagraph": "(a)",
   "SubTopic": "10",
   "Topic": "230",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-14"
  },
  "r7": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "15",
   "SubTopic": "10",
   "Topic": "220",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-15"
  },
  "r8": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "SubTopic": "405",
   "Topic": "942",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481071/942-405-45-2"
  },
  "r9": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "25",
   "Subparagraph": "(g)",
   "SubTopic": "10",
   "Topic": "230",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-25"
  },
  "r10": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28",
   "Subparagraph": "(a)",
   "SubTopic": "10",
   "Topic": "230",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-28"
  },
  "r11": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28",
   "Subparagraph": "(b)",
   "SubTopic": "10",
   "Topic": "230",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-28"
  },
  "r12": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "SubTopic": "10",
   "Topic": "360",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482099/360-10-50-1"
  },
  "r13": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "SubTopic": "20",
   "Topic": "715",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r14": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "SubTopic": "605",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r15": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "SubTopic": "80",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480109/944-80-50-1"
  },
  "r16": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1A",
   "Subparagraph": "(c),(3)",
   "SubTopic": "10",
   "Topic": "810",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-1A"
  },
  "r17": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "SubTopic": "10",
   "Topic": "505",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-2"
  },
  "r18": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(bbb)",
   "SubTopic": "10",
   "Topic": "820",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r19": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)",
   "SubTopic": "10",
   "Topic": "820",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r20": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2A",
   "Subparagraph": "(a)",
   "SubTopic": "10",
   "Topic": "718",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2A"
  },
  "r21": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "SubTopic": "40",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r22": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4D",
   "Subparagraph": "(b)",
   "SubTopic": "10",
   "Topic": "815",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480434/815-10-50-4D"
  },
  "r23": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6A",
   "Subparagraph": "(a)",
   "SubTopic": "10",
   "Topic": "820",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-6A"
  },
  "r24": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8",
   "SubTopic": "10",
   "Topic": "230",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-8"
  },
  "r25": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8",
   "SubTopic": "10",
   "Topic": "320",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-8"
  },
  "r26": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "15",
   "SubTopic": "10",
   "Topic": "220",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482739/220-10-55-15"
  },
  "r27": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(22))",
   "SubTopic": "10",
   "Topic": "210",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r28": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "210",
   "SubTopic": "10",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02.19-26)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r29": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "210",
   "SubTopic": "10",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02.22(a)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r30": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "210",
   "SubTopic": "10",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02.22)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r31": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "210",
   "SubTopic": "10",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02.25)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r32": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "210",
   "SubTopic": "10",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02.29,30)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r33": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "210",
   "SubTopic": "10",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02.29-31)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r34": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "220",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "14",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-14"
  },
  "r35": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "220",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-14A"
  },
  "r36": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "220",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-5"
  },
  "r37": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "12",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-12"
  },
  "r38": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "12",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-12"
  },
  "r39": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "12",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-12"
  },
  "r40": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "13",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-13"
  },
  "r41": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "15",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-15"
  },
  "r42": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "45",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-4"
  },
  "r43": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-2"
  },
  "r44": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-3"
  },
  "r45": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-4"
  },
  "r46": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "230",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-5"
  },
  "r47": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "280",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "22",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r48": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "280",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "25",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-25"
  },
  "r49": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "280",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "30",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r50": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "280",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "30",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r51": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "280",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "31",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-31"
  },
  "r52": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "280",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "40",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-40"
  },
  "r53": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "320",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//320/tableOfContent"
  },
  "r54": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "350",
   "SubTopic": "20",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r55": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "360",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482099/360-10-50-1"
  },
  "r56": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "470",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481544/470-10-50-5"
  },
  "r57": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "505",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-3"
  },
  "r58": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "505",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-4"
  },
  "r59": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "505",
   "SubTopic": "30",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481549/505-30-45-1"
  },
  "r60": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "505",
   "SubTopic": "30",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481520/505-30-50-4"
  },
  "r61": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "715",
   "SubTopic": "20",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-2"
  },
  "r62": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "715",
   "SubTopic": "20",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-3"
  },
  "r63": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "715",
   "SubTopic": "20",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-4"
  },
  "r64": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "715",
   "SubTopic": "20",
   "Section": "55",
   "Paragraph": "17",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480482/715-20-55-17"
  },
  "r65": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "718",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(d)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r66": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "810",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "b",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-4"
  },
  "r67": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "810",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-6"
  },
  "r68": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "820",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r69": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "820",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r70": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "820",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-3"
  },
  "r71": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "825",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482907/825-10-50-11"
  },
  "r72": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "825",
   "SubTopic": "10",
   "Section": "50",
   "Paragraph": "12",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482907/825-10-50-12"
  },
  "r73": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "835",
   "SubTopic": "30",
   "Section": "45",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482925/835-30-45-3"
  },
  "r74": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "942",
   "SubTopic": "210",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03.15(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r75": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "942",
   "SubTopic": "210",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03.15)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r76": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "942",
   "SubTopic": "210",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03.17)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r77": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "942",
   "SubTopic": "210",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03.5)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r78": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "942",
   "SubTopic": "470",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480848/942-470-50-3"
  },
  "r79": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "944",
   "SubTopic": "40",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r80": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Name": "Accounting Standards Codification",
   "Topic": "944",
   "SubTopic": "720",
   "Section": "25",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479448/944-720-25-2"
  },
  "r81": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(20))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r82": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(24))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r83": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(28))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r84": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(29))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r85": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(30)(a)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r86": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(30)(a)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r87": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(30))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r88": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(31))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r89": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(32))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r90": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//220/tableOfContent"
  },
  "r91": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Section": "45",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-1"
  },
  "r92": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-11"
  },
  "r93": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(10))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r94": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(20))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r95": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03.6)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r96": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03.7(a),(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r97": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03.7(c),9(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r98": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03.8)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r99": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03.9)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r100": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "230",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//230/tableOfContent"
  },
  "r101": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "13",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-13"
  },
  "r102": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "13",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-13"
  },
  "r103": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "24",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-24"
  },
  "r104": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "25",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-25"
  },
  "r105": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-28"
  },
  "r106": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "235",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//235/tableOfContent"
  },
  "r107": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "310",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SAB Topic 4.E)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480418/310-10-S99-2"
  },
  "r108": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "450",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//450/tableOfContent"
  },
  "r109": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.3-04)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480008/505-10-S99-1"
  },
  "r110": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "715",
   "SubTopic": "20",
   "Subparagraph": "(h)",
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Section": "50",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r111": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "15",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482685/740-10-50-15"
  },
  "r112": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "19",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481231/810-10-45-19"
  },
  "r113": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "860",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481420/860-30-50-1A"
  },
  "r114": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(1)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r115": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(10))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r116": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(11))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r117": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(15)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r118": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(23))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r119": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-04(15))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483589/942-220-S99-1"
  },
  "r120": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-04(22))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483589/942-220-S99-1"
  },
  "r121": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "942",
   "SubTopic": "470",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480876/942-470-45-1"
  },
  "r122": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04.5,6,7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r123": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r124": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r125": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(cc)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r126": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB Topic 5.W)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479583/944-40-S99-1"
  },
  "r127": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r128": {
   "role": "http://fasb.org/us-gaap/role/ref/legacyRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r129": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(aa)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r130": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r131": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r132": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r133": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r134": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-6"
  },
  "r135": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-6"
  },
  "r136": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-6"
  },
  "r137": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-7"
  },
  "r138": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8B",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-8B"
  },
  "r139": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r140": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r141": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r142": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r143": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r144": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "944",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479432/944-30-50-2"
  },
  "r145": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479686/944-605-45-1"
  },
  "r146": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r147": {
   "role": "http://fasb.org/us-gaap/role/ref/otherTransitionRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r148": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "SubTopic": "10",
   "Topic": "321",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479567/321-10-45-1"
  },
  "r149": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "SubTopic": "825",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479408/944-825-45-1"
  },
  "r150": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Subparagraph": "(a)",
   "SubTopic": "20",
   "Topic": "740",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482659/740-20-45-2"
  },
  "r151": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "SubTopic": "210",
   "Topic": "946",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480555/946-210-45-20"
  },
  "r152": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "SubTopic": "220",
   "Topic": "946",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483581/946-220-45-5"
  },
  "r153": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7A",
   "SubTopic": "10",
   "Topic": "310",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481962/310-10-50-7A"
  },
  "r154": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(d)(1)",
   "SubTopic": "20",
   "Topic": "310",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481925/310-20-65-2"
  },
  "r155": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(d)(2)",
   "SubTopic": "20",
   "Topic": "310",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481925/310-20-65-2"
  },
  "r156": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.4-08(h))",
   "SubTopic": "10",
   "Topic": "235",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480678/235-10-S99-1"
  },
  "r157": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(13)(a)(2))",
   "SubTopic": "210",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r158": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Accounting Standards Codification",
   "Topic": "250",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//250/tableOfContent"
  },
  "r159": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(a)",
   "Publisher": "SEC"
  },
  "r160": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1405",
   "Paragraph": "(a)",
   "Subparagraph": "(1)",
   "Publisher": "SEC"
  },
  "r161": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1405",
   "Paragraph": "(a)",
   "Subparagraph": "(2)",
   "Publisher": "SEC"
  },
  "r162": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "105",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479343/105-10-65-6"
  },
  "r163": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "105",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479343/105-10-65-6"
  },
  "r164": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "205",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483499/205-20-50-1"
  },
  "r165": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "205",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483499/205-20-50-7"
  },
  "r166": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(14))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r167": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(15))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r168": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(17))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r169": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(18))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r170": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r171": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(27)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r172": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(28))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r173": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(29))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r174": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(3)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r175": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(30)(a)(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r176": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10A",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-10A"
  },
  "r177": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10A",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-10A"
  },
  "r178": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10A",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-10A"
  },
  "r179": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-11"
  },
  "r180": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "12",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-12"
  },
  "r181": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-14A"
  },
  "r182": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "17A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-17A"
  },
  "r183": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1A",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-1A"
  },
  "r184": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1A",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-1A"
  },
  "r185": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1A",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-1A"
  },
  "r186": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1B",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-1B"
  },
  "r187": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1B",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482790/220-10-45-1B"
  },
  "r188": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482765/220-10-50-4"
  },
  "r189": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482765/220-10-50-5"
  },
  "r190": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482765/220-10-50-6"
  },
  "r191": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r192": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(21))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r193": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(24))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r194": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(25))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r195": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "5",
   "Subparagraph": "(SAB Topic 6.B)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-5"
  },
  "r196": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-11"
  },
  "r197": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "12",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-12"
  },
  "r198": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "14",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-14"
  },
  "r199": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "17",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-17"
  },
  "r200": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "19",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-19"
  },
  "r201": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-2"
  },
  "r202": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "21D",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-21D"
  },
  "r203": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "24",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-24"
  },
  "r204": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "25",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-25"
  },
  "r205": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-2"
  },
  "r206": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-8"
  },
  "r207": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "235",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.4-08(g)(1)(ii))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480678/235-10-S99-1"
  },
  "r208": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "23",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483421/250-10-45-23"
  },
  "r209": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "24",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483421/250-10-45-24"
  },
  "r210": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483421/250-10-45-5"
  },
  "r211": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-1"
  },
  "r212": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-1"
  },
  "r213": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-1"
  },
  "r214": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-1"
  },
  "r215": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-1"
  },
  "r216": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-1"
  },
  "r217": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-11"
  },
  "r218": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-11"
  },
  "r219": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-3"
  },
  "r220": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-4"
  },
  "r221": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-7"
  },
  "r222": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-7"
  },
  "r223": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-8"
  },
  "r224": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483443/250-10-50-9"
  },
  "r225": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "5",
   "Subparagraph": "(SAB Topic 11.M.Q2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480530/250-10-S99-5"
  },
  "r226": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480530/250-10-S99-6"
  },
  "r227": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//260/tableOfContent"
  },
  "r228": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "10",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-10"
  },
  "r229": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-11"
  },
  "r230": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "16",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-16"
  },
  "r231": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-2"
  },
  "r232": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "22",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-22"
  },
  "r233": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "23",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-23"
  },
  "r234": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-28A"
  },
  "r235": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-3"
  },
  "r236": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "60B",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-60B"
  },
  "r237": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "60B",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-60B"
  },
  "r238": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "60B",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-60B"
  },
  "r239": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "7",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-7"
  },
  "r240": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482662/260-10-50-1"
  },
  "r241": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482662/260-10-50-1"
  },
  "r242": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482662/260-10-50-2"
  },
  "r243": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482662/260-10-50-3"
  },
  "r244": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "15",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482635/260-10-55-15"
  },
  "r245": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "272",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483014/272-10-45-1"
  },
  "r246": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "272",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482987/272-10-50-1"
  },
  "r247": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "272",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482987/272-10-50-3"
  },
  "r248": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//280/tableOfContent"
  },
  "r249": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "15",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-15"
  },
  "r250": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "21",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-21"
  },
  "r251": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "21",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-21"
  },
  "r252": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r253": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r254": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r255": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r256": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r257": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r258": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r259": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(g)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r260": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r261": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "22",
   "Subparagraph": "(j)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-22"
  },
  "r262": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "25",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-25"
  },
  "r263": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "25",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-25"
  },
  "r264": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "26",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-26"
  },
  "r265": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "30",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r266": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "30",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r267": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "30",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r268": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "30",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r269": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "31",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-31"
  },
  "r270": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "32",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-32"
  },
  "r271": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "32",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-32"
  },
  "r272": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "32",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-32"
  },
  "r273": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "32",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-32"
  },
  "r274": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "32",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-32"
  },
  "r275": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "32",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-32"
  },
  "r276": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "34",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-34"
  },
  "r277": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "40",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-40"
  },
  "r278": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "41",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-41"
  },
  "r279": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "41",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-41"
  },
  "r280": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "42",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-42"
  },
  "r281": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481830/320-10-45-1"
  },
  "r282": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481830/320-10-45-11"
  },
  "r283": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r284": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r285": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(aa)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r286": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(aaa)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r287": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r288": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r289": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r290": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-3"
  },
  "r291": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-3"
  },
  "r292": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-3"
  },
  "r293": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-3"
  },
  "r294": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-3"
  },
  "r295": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r296": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r297": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(aaa)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r298": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r299": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r300": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r301": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r302": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r303": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r304": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r305": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5A",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5A"
  },
  "r306": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5A",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5A"
  },
  "r307": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5A",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5A"
  },
  "r308": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5B"
  },
  "r309": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5B",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5B"
  },
  "r310": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5B",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5B"
  },
  "r311": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5B",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5B"
  },
  "r312": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5B",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5B"
  },
  "r313": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-9"
  },
  "r314": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-9"
  },
  "r315": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "323",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481687/323-10-50-3"
  },
  "r316": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "323",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481687/323-10-50-3"
  },
  "r317": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "323",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481687/323-10-50-3"
  },
  "r318": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "323",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481687/323-10-50-3"
  },
  "r319": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "4",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479654/326-10-65-4"
  },
  "r320": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "4",
   "Subparagraph": "(e)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479654/326-10-65-4"
  },
  "r321": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "4",
   "Subparagraph": "(e)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479654/326-10-65-4"
  },
  "r322": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "5",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479654/326-10-65-5"
  },
  "r323": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479344/326-20-45-1"
  },
  "r324": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-11"
  },
  "r325": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r326": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r327": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r328": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r329": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r330": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r331": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "14",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-14"
  },
  "r332": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "16",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-16"
  },
  "r333": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-5"
  },
  "r334": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-5"
  },
  "r335": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479130/326-30-45-1"
  },
  "r336": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479130/326-30-45-2"
  },
  "r337": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-4"
  },
  "r338": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-4"
  },
  "r339": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-4"
  },
  "r340": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-4"
  },
  "r341": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-5"
  },
  "r342": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-7"
  },
  "r343": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r344": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r345": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r346": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r347": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r348": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r349": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r350": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-9"
  },
  "r351": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482598/350-20-45-1"
  },
  "r352": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r353": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r354": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r355": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r356": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r357": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r358": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r359": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(g)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r360": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r361": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "360",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482099/360-10-50-3"
  },
  "r362": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "360",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482099/360-10-50-3"
  },
  "r363": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "420",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482017/420-10-50-1"
  },
  "r364": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "420",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482017/420-10-50-1"
  },
  "r365": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "420",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SAB Topic 5.P.4(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479823/420-10-S99-2"
  },
  "r366": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "450",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483076/450-20-50-4"
  },
  "r367": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "450",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483076/450-20-50-9"
  },
  "r368": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "450",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB Topic 5.Y.Q2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480102/450-20-S99-1"
  },
  "r369": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "450",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB Topic 5.Y.Q4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480102/450-20-S99-1"
  },
  "r370": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1A",
   "Subparagraph": "(SX 210.13-01(a)(4)(i))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1A"
  },
  "r371": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1A",
   "Subparagraph": "(SX 210.13-01(a)(4)(iii)(A))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1A"
  },
  "r372": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1A",
   "Subparagraph": "(SX 210.13-01(a)(4)(iv))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1A"
  },
  "r373": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1A",
   "Subparagraph": "(SX 210.13-01(a)(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1A"
  },
  "r374": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1B",
   "Subparagraph": "(SX 210.13-02(a)(4)(i))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1B"
  },
  "r375": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1B",
   "Subparagraph": "(SX 210.13-02(a)(4)(iii)(A))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1B"
  },
  "r376": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1B",
   "Subparagraph": "(SX 210.13-02(a)(4)(iii)(B))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1B"
  },
  "r377": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1B",
   "Subparagraph": "(SX 210.13-02(a)(4)(iv))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1B"
  },
  "r378": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1B",
   "Subparagraph": "(SX 210.13-02(a)(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1B"
  },
  "r379": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1B",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-1B"
  },
  "r380": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1D",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-1D"
  },
  "r381": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1F",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-1F"
  },
  "r382": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1I",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-1I"
  },
  "r383": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-6"
  },
  "r384": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-13"
  },
  "r385": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-13"
  },
  "r386": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-13"
  },
  "r387": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "14",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-14"
  },
  "r388": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "18",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-18"
  },
  "r389": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-2"
  },
  "r390": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.3-04)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480008/505-10-S99-1"
  },
  "r391": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//715/tableOfContent"
  },
  "r392": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480535/715-20-45-2"
  },
  "r393": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "3A",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480535/715-20-45-3A"
  },
  "r394": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r395": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r396": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(10)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r397": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r398": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r399": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r400": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(5)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r401": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(6)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r402": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r403": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(8)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r404": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(9)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r405": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r406": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r407": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r408": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r409": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r410": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(5)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r411": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(6)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r412": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r413": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(8)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r414": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r415": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r416": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r417": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r418": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(01)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r419": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(02)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r420": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(02)(A)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r421": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(02)(B)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r422": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(02)(C)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r423": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(03)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r424": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r425": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r426": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(g)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r427": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r428": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r429": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r430": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r431": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r432": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(5)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r433": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(6)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r434": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)(7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r435": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r436": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(j)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r437": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(k)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r438": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(k)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r439": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(k)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r440": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(k)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r441": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(l)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r442": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(n)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r443": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(o)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r444": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(p)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r445": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(q)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r446": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(r)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r447": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(r)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r448": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-2"
  },
  "r449": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r450": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r451": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r452": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r453": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r454": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(5)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r455": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(6)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r456": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r457": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-6"
  },
  "r458": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-8"
  },
  "r459": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480126/715-20-S99-2"
  },
  "r460": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "60",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480266/715-60-50-3"
  },
  "r461": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "70",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480794/715-70-50-1"
  },
  "r462": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "35",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480606/715-80-35-1"
  },
  "r463": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-11"
  },
  "r464": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-5"
  },
  "r465": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-9"
  },
  "r466": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480454/718-10-45-1"
  },
  "r467": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r468": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r469": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r470": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r471": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r472": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(iii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r473": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(iv)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r474": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(iv)(01)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r475": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(iv)(02)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r476": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(iv)(03)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r477": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)(iv)(04)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r478": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r479": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r480": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)(iii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r481": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)(iii)(01)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r482": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)(iii)(02)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r483": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)(iii)(03)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r484": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(d)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r485": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(d)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r486": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(e)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r487": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(e)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r488": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r489": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r490": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)(iii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r491": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)(iv)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r492": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)(v)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480429/718-10-50-2"
  },
  "r493": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "15",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480336/718-10-65-15"
  },
  "r494": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "15",
   "Subparagraph": "(f)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480336/718-10-65-15"
  },
  "r495": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "718",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "15",
   "Subparagraph": "(f)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480336/718-10-65-15"
  },
  "r496": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482525/740-10-45-4"
  },
  "r497": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "6",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482525/740-10-45-6"
  },
  "r498": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "10",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482685/740-10-50-10"
  },
  "r499": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "8",
   "Subparagraph": "(d)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482615/740-10-65-8"
  },
  "r500": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "8",
   "Subparagraph": "(d)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482615/740-10-65-8"
  },
  "r501": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "8",
   "Subparagraph": "(e)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482615/740-10-65-8"
  },
  "r502": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "8",
   "Subparagraph": "(e)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482615/740-10-65-8"
  },
  "r503": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "8",
   "Subparagraph": "(e)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482615/740-10-65-8"
  },
  "r504": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB TOPIC 6.I.7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479360/740-10-S99-1"
  },
  "r505": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482659/740-20-45-11"
  },
  "r506": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "740",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482659/740-20-45-2"
  },
  "r507": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "19",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481231/810-10-45-19"
  },
  "r508": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "25",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481231/810-10-45-25"
  },
  "r509": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "25",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481231/810-10-45-25"
  },
  "r510": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1A",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-1A"
  },
  "r511": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1A",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-1A"
  },
  "r512": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(bb)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-3"
  },
  "r513": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481203/810-10-50-3"
  },
  "r514": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r515": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(h)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r516": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(h)(1)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r517": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(h)(1)(iii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r518": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(h)(1)(iv)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r519": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(i)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r520": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(i)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480528/815-20-65-6"
  },
  "r521": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480237/815-40-50-5"
  },
  "r522": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "1",
   "Subparagraph": "(e)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-1"
  },
  "r523": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "1",
   "Subparagraph": "(e)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-1"
  },
  "r524": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "1",
   "Subparagraph": "(e)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-1"
  },
  "r525": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "1",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-1"
  },
  "r526": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-2"
  },
  "r527": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-2"
  },
  "r528": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(c)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-2"
  },
  "r529": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "35",
   "Paragraph": "54B",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482134/820-10-35-54B"
  },
  "r530": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r531": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r532": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r533": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(bbb)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r534": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(bbb)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r535": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(bbb)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r536": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r537": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(1a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r538": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r539": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2E",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2E"
  },
  "r540": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-3"
  },
  "r541": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-6A"
  },
  "r542": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6A",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-6A"
  },
  "r543": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482736/825-10-45-1A"
  },
  "r544": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482736/825-10-45-2"
  },
  "r545": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "28",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482907/825-10-50-28"
  },
  "r546": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(e)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482833/825-10-65-6"
  },
  "r547": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(e)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482833/825-10-65-6"
  },
  "r548": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "6",
   "Subparagraph": "(e)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482833/825-10-65-6"
  },
  "r549": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "17",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-17"
  },
  "r550": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-20"
  },
  "r551": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-20"
  },
  "r552": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-20"
  },
  "r553": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-20"
  },
  "r554": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-20"
  },
  "r555": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481674/830-30-50-1"
  },
  "r556": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "5",
   "Subparagraph": "(f)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479832/842-10-65-5"
  },
  "r557": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "5",
   "Subparagraph": "(f)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479832/842-10-65-5"
  },
  "r558": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479041/842-20-45-1"
  },
  "r559": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479041/842-20-45-5"
  },
  "r560": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479041/842-20-45-5"
  },
  "r561": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479041/842-20-45-5"
  },
  "r562": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(g)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147478964/842-20-50-4"
  },
  "r563": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(g)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147478964/842-20-50-4"
  },
  "r564": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147478964/842-20-50-6"
  },
  "r565": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "848",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(a)(3)(iii)(03)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483550/848-10-65-2"
  },
  "r566": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "848",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483550/848-10-65-2"
  },
  "r567": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)(2)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r568": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)(2)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r569": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r570": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(bb)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r571": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(bb)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r572": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(bb)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r573": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r574": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r575": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r576": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r577": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r578": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r579": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r580": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481444/860-30-45-1"
  },
  "r581": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481420/860-30-50-7"
  },
  "r582": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-3"
  },
  "r583": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-3"
  },
  "r584": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-3"
  },
  "r585": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)(4)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-3"
  },
  "r586": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r587": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r588": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r589": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r590": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(5)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r591": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(6)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r592": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(a)(7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r593": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r594": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(e)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r595": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(e)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r596": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "860",
   "SubTopic": "50",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(e)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481229/860-50-50-4"
  },
  "r597": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "910",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482546/910-10-50-6"
  },
  "r598": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "924",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB Topic 11.L)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479941/924-10-S99-1"
  },
  "r599": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "926",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(f)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483194/926-20-65-2"
  },
  "r600": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "926",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483194/926-20-65-2"
  },
  "r601": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "926",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(f)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483194/926-20-65-2"
  },
  "r602": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(10)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r603": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(6))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r604": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-04(23))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483589/942-220-S99-1"
  },
  "r605": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-04(26))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483589/942-220-S99-1"
  },
  "r606": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-04(27))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483589/942-220-S99-1"
  },
  "r607": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-05(b)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479557/942-235-S99-1"
  },
  "r608": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-2"
  },
  "r609": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r610": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r611": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r612": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3"
  },
  "r613": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3A",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3A"
  },
  "r614": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3A",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3A"
  },
  "r615": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3A",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3A"
  },
  "r616": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3A",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480832/942-320-50-3A"
  },
  "r617": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "942",
   "SubTopic": "360",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480842/942-360-50-1"
  },
  "r618": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479838/944-20-50-3"
  },
  "r619": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479838/944-20-50-4"
  },
  "r620": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479838/944-20-50-5"
  },
  "r621": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(15))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r622": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(1)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r623": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(1)(g))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r624": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(1)(h))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r625": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r626": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(10))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r627": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(12))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r628": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(15)(b)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r629": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(16)(a)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r630": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(19))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r631": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r632": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(21))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r633": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(22))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r634": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r635": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r636": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(25))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r637": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r638": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(6))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r639": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r640": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(8)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r641": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(8))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r642": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(11))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r643": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(16))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r644": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(18))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r645": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(19))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r646": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(2)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r647": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(2)(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r648": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r649": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(22))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r650": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(23))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r651": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(3)(d)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r652": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r653": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(7)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r654": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(9))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r655": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column A))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r656": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column B))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r657": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column C))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r658": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column D))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r659": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column E))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r660": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column F))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r661": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column G))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r662": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column H))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r663": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column I))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r664": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column J))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r665": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-16(Column K))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-1"
  },
  "r666": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-17(Column A))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-2"
  },
  "r667": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-17(Column B))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-2"
  },
  "r668": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-17(Column C))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-2"
  },
  "r669": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-17(Column D))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-2"
  },
  "r670": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-17(Column E))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-2"
  },
  "r671": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "235",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-17(Column F))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480149/944-235-S99-2"
  },
  "r672": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479432/944-30-50-1"
  },
  "r673": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2B",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479432/944-30-50-2B"
  },
  "r674": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2B",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479432/944-30-50-2B"
  },
  "r675": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479616/944-310-45-5"
  },
  "r676": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "340",
   "Name": "Accounting Standards Codification",
   "Section": "25",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479928/944-340-25-1"
  },
  "r677": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//944-40/tableOfContent"
  },
  "r678": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r679": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7A",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-7A"
  },
  "r680": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r681": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(f)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r682": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(f)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r683": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(g)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r684": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(g)(2)(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r685": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(g)(2)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r686": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(g)(2)(iii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r687": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(g)(2)(iv)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r688": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "2",
   "Subparagraph": "(h)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480016/944-40-65-2"
  },
  "r689": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479686/944-605-45-1"
  },
  "r690": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r691": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r692": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r693": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r694": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r695": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r696": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "825",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479383/944-825-50-1A"
  },
  "r697": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "825",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1B",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479383/944-825-50-1B"
  },
  "r698": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "944",
   "SubTopic": "825",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1B",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479383/944-825-50-1B"
  },
  "r699": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-03(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479886/946-10-S99-3"
  },
  "r700": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-03(i)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479886/946-10-S99-3"
  },
  "r701": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-03(i)(2)(i))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479886/946-10-S99-3"
  },
  "r702": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-03(i)(2)(ii))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479886/946-10-S99-3"
  },
  "r703": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-03(i)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479886/946-10-S99-3"
  },
  "r704": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480990/946-20-50-11"
  },
  "r705": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480767/946-205-45-3"
  },
  "r706": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "4",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480767/946-205-45-4"
  },
  "r707": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-2"
  },
  "r708": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "27",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-27"
  },
  "r709": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r710": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r711": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r712": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r713": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r714": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r715": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(g)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r716": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480737/946-205-50-7"
  },
  "r717": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "21",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480555/946-210-45-21"
  },
  "r718": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480555/946-210-45-4"
  },
  "r719": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-1"
  },
  "r720": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-1"
  },
  "r721": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-1"
  },
  "r722": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-6"
  },
  "r723": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-6"
  },
  "r724": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-6"
  },
  "r725": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-6"
  },
  "r726": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r727": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(11))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r728": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(12)(b)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r729": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(12)(b)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r730": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(12)(b)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r731": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(13)(a)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r732": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(13)(a)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r733": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(14))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r734": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(15))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r735": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(16)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r736": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(17))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r737": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(19))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r738": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(2)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r739": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(2)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r740": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(3)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r741": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(3)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r742": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(3)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r743": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r744": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(6)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r745": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(6)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r746": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(6)(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r747": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(6)(e))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r748": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(8))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r749": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(9)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r750": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(9)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r751": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(9)(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r752": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(9)(e))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r753": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.6-05(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-2"
  },
  "r754": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.6-05(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-2"
  },
  "r755": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483581/946-220-45-3"
  },
  "r756": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "7",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483581/946-220-45-7"
  },
  "r757": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483580/946-220-50-3"
  },
  "r758": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(1)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r759": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r760": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(2)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r761": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(2)(g)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r762": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r763": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(a)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r764": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(a)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r765": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(a)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r766": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(a)(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r767": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(a)(6))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r768": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(a)(7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r769": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(c)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r770": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(c)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r771": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(c)(3))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r772": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(c)(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r773": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(c)(6))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r774": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(7)(c)(7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r775": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-07(9))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-1"
  },
  "r776": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-09(1)(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-3"
  },
  "r777": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-09(4)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-3"
  },
  "r778": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-09(6))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-3"
  },
  "r779": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-09(7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-3"
  },
  "r780": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-12(Column A)(Footnote 1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-1"
  },
  "r781": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-12(Column A)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-1"
  },
  "r782": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-12(Column C)(Footnote 5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-1"
  },
  "r783": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-12A(Column A)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-2"
  },
  "r784": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-12A(Column C)(Footnote 4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-2"
  },
  "r785": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.12-12B(Column A)(Footnote 4)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-3"
  },
  "r786": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.12-12B(Column A)(Footnote 4)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-3"
  },
  "r787": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.12-12B(Column A)(Footnote 7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-3"
  },
  "r788": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-3"
  },
  "r789": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "5D",
   "Subparagraph": "(SX 210.12-13D(Column B)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-5D"
  },
  "r790": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "5D",
   "Subparagraph": "(SX 210.12-13D(Column C)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-5D"
  },
  "r791": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column A)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r792": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column C)(Footnote 4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r793": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column C)(Footnote 6)(e))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r794": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column C))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r795": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column E)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r796": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column E)(Footnote 4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r797": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column E)(Footnote 6)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r798": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column F)(Footnote 7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r799": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column A))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r800": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column B))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r801": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column C))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r802": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column D))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r803": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "505",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481004/946-505-50-1"
  },
  "r804": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "505",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481004/946-505-50-2"
  },
  "r805": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "505",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481004/946-505-50-2"
  },
  "r806": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "505",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481004/946-505-50-2"
  },
  "r807": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "946",
   "SubTopic": "505",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481004/946-505-50-2"
  },
  "r808": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "976",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482856/976-310-50-1"
  },
  "r809": {
   "role": "http://www.xbrl.org/2003/role/disclosureRef",
   "Topic": "978",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482707/978-310-50-1"
  },
  "r810": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "13H",
   "Subparagraph": "(a)",
   "SubTopic": "40",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480046/944-40-55-13H"
  },
  "r811": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column A))",
   "SubTopic": "320",
   "Topic": "946",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r812": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483467/210-10-45-1"
  },
  "r813": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "52",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482635/260-10-55-52"
  },
  "r814": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "30",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-30"
  },
  "r815": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "31",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-31"
  },
  "r816": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "310",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "12A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481933/310-10-55-12A"
  },
  "r817": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "15",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479294/326-20-55-15"
  },
  "r818": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "79",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479294/326-20-55-79"
  },
  "r819": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "80",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479294/326-20-55-80"
  },
  "r820": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "8",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479081/326-30-55-8"
  },
  "r821": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "24",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482548/350-20-55-24"
  },
  "r822": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "69B",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481568/470-20-55-69B"
  },
  "r823": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "69C",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481568/470-20-55-69C"
  },
  "r824": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "69E",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481568/470-20-55-69E"
  },
  "r825": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "69F",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481568/470-20-55-69F"
  },
  "r826": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-13"
  },
  "r827": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "606",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "91",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479777/606-10-55-91"
  },
  "r828": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r829": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(iv)(01)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r830": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "17",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480482/715-20-55-17"
  },
  "r831": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "18",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480482/715-20-55-18"
  },
  "r832": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-11"
  },
  "r833": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-11"
  },
  "r834": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-11"
  },
  "r835": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-6"
  },
  "r836": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-6"
  },
  "r837": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480576/715-80-50-6"
  },
  "r838": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "715",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "8",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480547/715-80-55-8"
  },
  "r839": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "4J",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481175/810-10-55-4J"
  },
  "r840": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "810",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481175/810-10-55-4K"
  },
  "r841": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "842",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "53",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479589/842-20-55-53"
  },
  "r842": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "852",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "10",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481372/852-10-55-10"
  },
  "r843": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "944",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479401/944-30-55-2"
  },
  "r844": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "29F",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480046/944-40-55-29F"
  },
  "r845": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "12",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479629/944-605-55-12"
  },
  "r846": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "944",
   "SubTopic": "605",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "15",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479629/944-605-55-15"
  },
  "r847": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-1"
  },
  "r848": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Subparagraph": "(a)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480524/946-210-50-6"
  },
  "r849": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480493/946-210-55-1"
  },
  "r850": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "230",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480348/946-230-55-1"
  },
  "r851": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480833/946-310-45-1"
  },
  "r852": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-12(Column A)(Footnote 2)(i))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-1"
  },
  "r853": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.12-12A(Column A)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-2"
  },
  "r854": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.12-12B(Column A)(Footnote 1)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-3"
  },
  "r855": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "6",
   "Subparagraph": "(SX 210.12-14(Column A)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-6"
  },
  "r856": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column B))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r857": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column C))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r858": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "7",
   "Subparagraph": "(SX 210.12-15(Column D))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-7"
  },
  "r859": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "830",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "10",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480167/946-830-55-10"
  },
  "r860": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "830",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480167/946-830-55-11"
  },
  "r861": {
   "role": "http://www.xbrl.org/2003/role/exampleRef",
   "Topic": "946",
   "SubTopic": "830",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "12",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480167/946-830-55-12"
  },
  "r862": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "12",
   "Subsection": "b"
  },
  "r863": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r864": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r865": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 10-Q",
   "Number": "240",
   "Section": "308",
   "Subsection": "a"
  },
  "r866": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "16",
   "Subsection": "J",
   "Paragraph": "a"
  },
  "r867": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1"
  },
  "r868": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "i"
  },
  "r869": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "A"
  },
  "r870": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "B"
  },
  "r871": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "C"
  },
  "r872": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "D"
  },
  "r873": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "E"
  },
  "r874": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "ii"
  },
  "r875": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "iii"
  },
  "r876": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Section": "6",
   "Subsection": "F",
   "Paragraph": "2"
  },
  "r877": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 20-F",
   "Subsection": "F",
   "Paragraph": "1",
   "Subparagraph": "ii",
   "Section": "6"
  },
  "r878": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a"
  },
  "r879": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "1"
  },
  "r880": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "i"
  },
  "r881": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "ii"
  },
  "r882": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "iii"
  },
  "r883": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "iv"
  },
  "r884": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "v"
  },
  "r885": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "2"
  },
  "r886": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "a",
   "Subparagraph": "3"
  },
  "r887": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form 40-F",
   "Section": "19",
   "Paragraph": "b"
  },
  "r888": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a"
  },
  "r889": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "1"
  },
  "r890": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "i"
  },
  "r891": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "ii"
  },
  "r892": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "iii"
  },
  "r893": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "iv"
  },
  "r894": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "1",
   "Sentence": "v"
  },
  "r895": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "2"
  },
  "r896": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "a",
   "Subparagraph": "3"
  },
  "r897": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Form N-CSR",
   "Section": "18",
   "Paragraph": "b"
  },
  "r898": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Section": "13",
   "Subsection": "a-1"
  },
  "r899": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v"
  },
  "r900": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "1"
  },
  "r901": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "2",
   "Subparagraph": "ii"
  },
  "r902": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "2",
   "Subparagraph": "iii"
  },
  "r903": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "2",
   "Subparagraph": "iv"
  },
  "r904": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "2",
   "Subparagraph": "vi"
  },
  "r905": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "3"
  },
  "r906": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "4"
  },
  "r907": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "5",
   "Subparagraph": "i"
  },
  "r908": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "5",
   "Subparagraph": "ii"
  },
  "r909": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "5",
   "Subparagraph": "iii"
  },
  "r910": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "5",
   "Subparagraph": "iv"
  },
  "r911": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "6"
  },
  "r912": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "v",
   "Paragraph": "6",
   "Subparagraph": "i"
  },
  "r913": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1"
  },
  "r914": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "i"
  },
  "r915": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "A"
  },
  "r916": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "B"
  },
  "r917": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "C"
  },
  "r918": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "D"
  },
  "r919": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "i",
   "Sentence": "E"
  },
  "r920": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "ii"
  },
  "r921": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "1",
   "Subparagraph": "iii"
  },
  "r922": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "w",
   "Paragraph": "2"
  },
  "r923": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "1"
  },
  "r924": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "2"
  },
  "r925": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "2",
   "Subparagraph": "ii",
   "Sentence": "A"
  },
  "r926": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "2",
   "Subparagraph": "ii",
   "Sentence": "C"
  },
  "r927": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "2",
   "Subparagraph": "ii",
   "Sentence": "D"
  },
  "r928": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "2",
   "Subparagraph": "ii",
   "Sentence": "E"
  },
  "r929": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "402",
   "Subsection": "x",
   "Paragraph": "2",
   "Subparagraph": "ii",
   "Sentence": "F"
  },
  "r930": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "a"
  },
  "r931": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "a",
   "Paragraph": "1"
  },
  "r932": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "a",
   "Paragraph": "2",
   "Subparagraph": "A"
  },
  "r933": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "a",
   "Paragraph": "2",
   "Subparagraph": "B"
  },
  "r934": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "a",
   "Paragraph": "2",
   "Subparagraph": "C"
  },
  "r935": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "a",
   "Paragraph": "2",
   "Subparagraph": "D"
  },
  "r936": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-K",
   "Number": "229",
   "Section": "408",
   "Subsection": "b",
   "Paragraph": "1"
  },
  "r937": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Regulation S-T",
   "Number": "232",
   "Section": "405"
  },
  "r938": {
   "role": "http://www.xbrl.org/2003/role/recommendedDisclosureRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-28"
  },
  "r939": {
   "role": "http://www.xbrl.org/2003/role/recommendedDisclosureRef",
   "Topic": "272",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483014/272-10-45-3"
  },
  "r940": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(b)(1)",
   "SubTopic": "605",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r941": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(c)(1)",
   "SubTopic": "605",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479655/944-605-50-1"
  },
  "r942": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11B",
   "Subparagraph": "(b)",
   "SubTopic": "10",
   "Topic": "310",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481962/310-10-50-11B"
  },
  "r943": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4H",
   "SubTopic": "40",
   "Topic": "944",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-4H"
  },
  "r944": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(a)",
   "SubTopic": "10",
   "Topic": "740",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482685/740-10-50-9"
  },
  "r945": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Topic": "321",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//321/tableOfContent"
  },
  "r946": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Accounting Standards Codification",
   "Topic": "325",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//325/tableOfContent"
  },
  "r947": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(a)",
   "Publisher": "SEC"
  },
  "r948": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(b)",
   "Subparagraph": "(1)",
   "Publisher": "SEC"
  },
  "r949": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(b)",
   "Subparagraph": "(2)",
   "Publisher": "SEC"
  },
  "r950": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(b)",
   "Subparagraph": "(3)",
   "Publisher": "SEC"
  },
  "r951": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(c)",
   "Subparagraph": "(2)(i)",
   "Publisher": "SEC"
  },
  "r952": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(c)",
   "Subparagraph": "(2)(ii)",
   "Publisher": "SEC"
  },
  "r953": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1402",
   "Paragraph": "(c)",
   "Subparagraph": "(2)(iii)",
   "Publisher": "SEC"
  },
  "r954": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Name": "Regulation S-K (SK)",
   "Number": "229",
   "Section": "1404",
   "Paragraph": "(a)",
   "Publisher": "SEC"
  },
  "r955": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r956": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(12))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r957": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(3)(a)(4))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r958": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "210",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.5-02(8))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480566/210-10-S99-1"
  },
  "r959": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482765/220-10-50-4"
  },
  "r960": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482765/220-10-50-5"
  },
  "r961": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "6",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482765/220-10-50-6"
  },
  "r962": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(7)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r963": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "220",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "2",
   "Subparagraph": "(SX 210.5-03(9)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483621/220-10-S99-2"
  },
  "r964": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "12",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-12"
  },
  "r965": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "15",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-15"
  },
  "r966": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-28"
  },
  "r967": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "28",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482740/230-10-45-28"
  },
  "r968": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "230",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "8",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482913/230-10-50-8"
  },
  "r969": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "235",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.4-08(d))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480678/235-10-S99-1"
  },
  "r970": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "235",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.4-08(g)(1)(ii))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480678/235-10-S99-1"
  },
  "r971": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "235",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.4-08(h)(1)(Note 1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480678/235-10-S99-1"
  },
  "r972": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "23",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483421/250-10-45-23"
  },
  "r973": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "24",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483421/250-10-45-24"
  },
  "r974": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "250",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483421/250-10-45-5"
  },
  "r975": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "55",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482689/260-10-45-55"
  },
  "r976": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "260",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482662/260-10-50-1"
  },
  "r977": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "280",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "18",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482810/280-10-50-18"
  },
  "r978": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "310",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "11B",
   "Subparagraph": "(c)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481962/310-10-50-11B"
  },
  "r979": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "310",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "29",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481962/310-10-50-29"
  },
  "r980": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "310",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481962/310-10-50-4"
  },
  "r981": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "310",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7A",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481962/310-10-50-7A"
  },
  "r982": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//320/tableOfContent"
  },
  "r983": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481830/320-10-45-1"
  },
  "r984": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "11",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481830/320-10-45-11"
  },
  "r985": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-2"
  },
  "r986": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-3"
  },
  "r987": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r988": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5"
  },
  "r989": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-5B"
  },
  "r990": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "320",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481800/320-10-50-9"
  },
  "r991": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "321",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479536/321-10-50-3"
  },
  "r992": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "321",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479536/321-10-50-3"
  },
  "r993": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "321",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479536/321-10-50-3"
  },
  "r994": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "321",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479536/321-10-50-4"
  },
  "r995": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "323",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481687/323-10-50-3"
  },
  "r996": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479344/326-20-45-1"
  },
  "r997": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r998": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r999": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r1000": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r1001": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r1002": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-13"
  },
  "r1003": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479319/326-20-50-5"
  },
  "r1004": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "326",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479106/326-30-50-4"
  },
  "r1005": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r1006": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "350",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482573/350-20-50-1"
  },
  "r1007": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "410",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "10",
   "Subparagraph": "(c)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481931/410-30-50-10"
  },
  "r1008": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "450",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483076/450-20-50-9"
  },
  "r1009": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "450",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB Topic 5.Y.Q2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480102/450-20-S99-1"
  },
  "r1010": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1A",
   "Subparagraph": "(SX 210.13-01(a)(4)(ii))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1A"
  },
  "r1011": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "470",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1A",
   "Subparagraph": "(SX 210.13-01(a)(4)(iii))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480097/470-10-S99-1A"
  },
  "r1012": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1B",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-1B"
  },
  "r1013": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "470",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1D",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481139/470-20-50-1D"
  },
  "r1014": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "505",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "13",
   "Subparagraph": "(h)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481112/505-10-50-13"
  },
  "r1015": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "606",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479806/606-10-50-5"
  },
  "r1016": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(d)(ii)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r1017": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "715",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(i)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480506/715-20-50-1"
  },
  "r1018": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "9",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482685/740-10-50-9"
  },
  "r1019": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "740",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SAB Topic 6.I.7)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479360/740-10-S99-1"
  },
  "r1020": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "815",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4K",
   "Subparagraph": "(a)(4)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480434/815-10-50-4K"
  },
  "r1021": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "815",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "65",
   "Paragraph": "1",
   "Subparagraph": "(e)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480175/815-40-65-1"
  },
  "r1022": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "820",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Subparagraph": "(bbb)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482106/820-10-50-2"
  },
  "r1023": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "825",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "28",
   "Subparagraph": "(f)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147482907/825-10-50-28"
  },
  "r1024": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "20",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481694/830-30-45-20"
  },
  "r1025": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "830",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481674/830-30-50-1"
  },
  "r1026": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "852",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481404/852-10-50-7"
  },
  "r1027": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "852",
   "SubTopic": "10",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "7",
   "Subparagraph": "(b)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481404/852-10-50-7"
  },
  "r1028": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r1029": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r1030": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(c)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-3"
  },
  "r1031": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)(1)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r1032": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)(2)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r1033": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "4",
   "Subparagraph": "(b)(3)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481326/860-20-50-4"
  },
  "r1034": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "860",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147481444/860-30-45-1"
  },
  "r1035": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "942",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.9-03(1)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479853/942-210-S99-1"
  },
  "r1036": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "942",
   "SubTopic": "470",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "1",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480876/942-470-45-1"
  },
  "r1037": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "2",
   "Subparagraph": "(d)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479868/944-20-45-2"
  },
  "r1038": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479838/944-20-50-3"
  },
  "r1039": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "20",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479838/944-20-50-5"
  },
  "r1040": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(13)(a)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1041": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(15)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1042": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1043": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(5)(a))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1044": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(5)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1045": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(5)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1046": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-03(a)(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479440/944-210-S99-1"
  },
  "r1047": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r1048": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(2)(c))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r1049": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r1050": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(5))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r1051": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.7-04(7)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483586/944-220-S99-1"
  },
  "r1052": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "30",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2B",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479432/944-30-50-2B"
  },
  "r1053": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "5",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479616/944-310-45-5"
  },
  "r1054": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "6",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479616/944-310-45-6"
  },
  "r1055": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "310",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "2",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479584/944-310-50-2"
  },
  "r1056": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r1057": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "3",
   "Subparagraph": "(cc)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480081/944-40-50-3"
  },
  "r1058": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "40",
   "Name": "Accounting Standards Codification",
   "Section": "55",
   "Paragraph": "9C",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480046/944-40-55-9C"
  },
  "r1059": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "944",
   "SubTopic": "80",
   "Name": "Accounting Standards Codification",
   "Section": "50",
   "Paragraph": "1",
   "Subparagraph": "(e)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480109/944-80-50-1"
  },
  "r1060": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "946",
   "SubTopic": "205",
   "Name": "Accounting Standards Codification",
   "Section": "45",
   "Paragraph": "4",
   "Subparagraph": "(a)",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480767/946-205-45-4"
  },
  "r1061": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "946",
   "SubTopic": "210",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.6-04(12)(b)(1))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147479617/946-210-S99-1"
  },
  "r1062": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-09(4)(b))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-3"
  },
  "r1063": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "946",
   "SubTopic": "220",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "3",
   "Subparagraph": "(SX 210.6-09(7))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147483575/946-220-S99-3"
  },
  "r1064": {
   "role": "http://www.xbrl.org/2009/role/commonPracticeRef",
   "Topic": "946",
   "SubTopic": "320",
   "Name": "Accounting Standards Codification",
   "Section": "S99",
   "Paragraph": "1",
   "Subparagraph": "(SX 210.12-12(Column A)(Footnote 2))",
   "Publisher": "FASB",
   "URI": "https://asc.fasb.org//1943274/2147480032/946-320-S99-1"
  }
 }
}
