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v2.4.1.9

Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds (Dividends) (Details) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statutory adjusted capital in excess of authorized risk based capital ratio | 4.5 sigi_StatutoryAdjustedCapitalInExcessOfAuthorizedRiskBasedCapitalRatio |  |
Total stockholders’ equity | $ 1,275,586,000 us-gaap_StockholdersEquity | $ 1,153,928,000 us-gaap_StockholdersEquity | $ 1,090,592,000 us-gaap_StockholdersEquity
Ordinary dividends paid | 57,500,000 us-gaap_CashDividendsPaidToParentCompany |  |
Maximum ordinary dividends | 162,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval |  |
Maximum borrowing percentage | 10.00%sigi_MaximumBorrowingPercentage |  |
Selective Insurace Company of America (SICA) [Member] |  |  |
Ordinary dividends paid | 22,000,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfAmericaMember |  |
Maximum ordinary dividends | 62,300,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfAmericaMember |  |
Selective Way Insurance Company (SWIC) [Member] |  |  |
Ordinary dividends paid | 18,200,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveWayInsuranceCompanyMember |  |
Maximum ordinary dividends | 32,700,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveWayInsuranceCompanyMember |  |
Selective Insurance Company of South Carolina (SICSC) [Member] |  |  |
Ordinary dividends paid | 5,000,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfSouthCarolinaMember |  |
Maximum ordinary dividends | 14,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfSouthCarolinaMember |  |
Selective Insurance Company of the Southeast (SICSE) [Member] |  |  |
Ordinary dividends paid | 2,000,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfSoutheastMember |  |
Maximum ordinary dividends | 10,500,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfSoutheastMember |  |
Selective Insurance Company of New York (SICNY) [Member] |  |  |
Ordinary dividends paid | 2,500,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfNewYorkMember |  |
Maximum ordinary dividends | 8,300,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfNewYorkMember |  |
Selective Insurance Company of New England (SICNE) [Member] |  |  |
Ordinary dividends paid | 2,000,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfNewEnglandMember |  |
Maximum ordinary dividends | 4,400,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveInsuranceCompanyOfNewEnglandMember |  |
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |  |
Ordinary dividends paid | 1,000,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveAutoInsuranceCompanyOfNewJerseyMember |  |
Maximum ordinary dividends | 8,900,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveAutoInsuranceCompanyOfNewJerseyMember |  |
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |  |
Maximum ordinary dividends | 7,300,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_MesaUnderwritingSpecialtyInsuranceCompanyMember |  |
Selective Casualty Insurance Company (SCIC) [Member] |  |  |
Ordinary dividends paid | 3,000,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveCasualtyInsuranceCompanyMember |  |
Maximum ordinary dividends | 9,500,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveCasualtyInsuranceCompanyMember |  |
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |  |
Ordinary dividends paid | 1,800,000 us-gaap_CashDividendsPaidToParentCompany / sigi_DividendsPaidToParentAxis = sigi_SelectiveFireAndCasualtyInsuranceCompanyMember |  |
Maximum ordinary dividends | 4,100,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / sigi_DividendsPaidToParentAxis = sigi_SelectiveFireAndCasualtyInsuranceCompanyMember |  |
Parent Company [Member] |  |  |
Investment Portfolio | 83,000,000 sigi_InvestmentPortfolioAndCashAvailableToFutureDividendsAndInterestPayments / sigi_DividendsPaidToParentAxis = us-gaap_ParentCompanyMember |  |
Total stockholders’ equity | 1,300,000,000 us-gaap_StockholdersEquity / sigi_DividendsPaidToParentAxis = us-gaap_ParentCompanyMember |  |
Additional Borrowing Capacity for Parent | $ 46,400,000 sigi_AdditionalBorrowingCapacityForParent / sigi_DividendsPaidToParentAxis = us-gaap_ParentCompanyMember |  |

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- Definition Investment Portfolio and cash available to fund future dividents and interest payments + References No definition available. + Details
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- Definition The amount of statutory adjusted capital in excess of the authorized control level risk-based capital computed using statutory accounting practices prescribed by the National Association of Insurance Commissioners. + References No definition available. + Details
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- Definition This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph b -Article 12 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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