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Parent Corporation Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $49,890 - 2014; $455,447 – 2013)	$ 4,066,122us-gaap_AvailableForSaleSecuritiesDebtSecurities	$ 3,715,536us-gaap_AvailableForSaleSecuritiesDebtSecurities
Short-term investments	131,972us-gaap_OtherShortTermInvestments	174,251us-gaap_OtherShortTermInvestments
Cash	23,959us-gaap_Cash	193us-gaap_Cash	210us-gaap_Cash	762us-gaap_Cash
Current federal income tax	0us-gaap_IncomeTaxReceivable	512us-gaap_IncomeTaxReceivable
Deferred federal income tax	98,449us-gaap_DeferredTaxAssetsNet	122,613us-gaap_DeferredTaxAssetsNet
Other assets	73,215us-gaap_OtherAssets	75,727us-gaap_OtherAssets
Total assets	6,581,550us-gaap_Assets	6,270,170us-gaap_Assets
Liabilities:
Notes payable	379,297us-gaap_LongTermDebt	392,414us-gaap_LongTermDebt
Other liabilities	190,675us-gaap_OtherLiabilities	203,476us-gaap_OtherLiabilities
Total liabilities	5,305,964us-gaap_Liabilities	5,116,242us-gaap_Liabilities
Stockholders’ Equity:
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 99,947,933 - 2014; 99,120,235 - 2013	199,896us-gaap_CommonStockValue	198,240us-gaap_CommonStockValue
Additional paid-in capital	305,385us-gaap_AdditionalPaidInCapitalCommonStock	288,182us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings	1,313,440us-gaap_RetainedEarningsAccumulatedDeficit	1,202,015us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income	19,788us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	24,851us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock - at cost (shares: 43,353,181 - 2014; 43,198,622 - 2013)	(562,923)us-gaap_TreasuryStockValue	(559,360)us-gaap_TreasuryStockValue
Total stockholders’ equity	1,275,586us-gaap_StockholdersEquity	1,153,928us-gaap_StockholdersEquity	1,090,592us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	6,581,550us-gaap_LiabilitiesAndStockholdersEquity	6,270,170us-gaap_LiabilitiesAndStockholdersEquity
Parent Company [Member]
ASSETS
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $49,890 - 2014; $455,447 – 2013)	50,028us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	55,623us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Short-term investments	16,605us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	15,399us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash	16,367us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	193us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	210us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	722us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in subsidiaries	1,604,162sigi_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,493,996sigi_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Current federal income tax	16,848us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	28,471us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred federal income tax	15,781us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	15,122us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other assets	7,268us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	9,410us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets	1,727,059us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,618,214us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Liabilities:
Notes payable	334,297us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	334,414us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany notes payable	88,961sigi_IntercompanyNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	102,721sigi_IntercompanyNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accrued Long Term Stock Compensation	21,890sigi_AccruedLongTermStockCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	20,828sigi_AccruedLongTermStockCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other liabilities	6,325us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6,323us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities	451,473us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	464,286us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stockholders’ Equity:
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding	0us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 99,947,933 - 2014; 99,120,235 - 2013	199,896us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	198,240us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Additional paid-in capital	305,385us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	288,182us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Retained earnings	1,313,440us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,202,015us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accumulated other comprehensive income	19,788us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	24,851us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Treasury stock - at cost (shares: 43,353,181 - 2014; 43,198,622 - 2013)	(562,923)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(559,360)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total stockholders’ equity	1,275,586us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,153,928us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and stockholders’ equity	$ 1,727,059us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 1,618,214us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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