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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income, Gross	$ 56,290sigi_IncomeLossFromContinuingOperationsAndDiscontinuedOperationsBeforeFederalIncomeTax	$ 25,084sigi_IncomeLossFromContinuingOperationsAndDiscontinuedOperationsBeforeFederalIncomeTax
Unrealized holding gains during the period, Gross	23,977us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	32,964us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Amounts reclassified into net income: HTM securities, Gross	(261)sigi_AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleBeforeTax	(456)sigi_AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleBeforeTax
Amounts reclassified into net income: non-credit OTTI	357sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesBeforeTax
Realized gains on AFS securities, Gross	(19,895)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(7,229)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Net unrealized gains, Gross	4,178sigi_TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross	25,279sigi_TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross
Amount reclassified into Net Income: Net actuarial loss, Gross	1,709us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	380us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Defined pension and other post-retirement benefit plans, gross	1,709us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	380us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive income, Gross	5,887us-gaap_OtherComprehensiveIncomeLossBeforeTax	25,659us-gaap_OtherComprehensiveIncomeLossBeforeTax
Net income, Tax	16,582sigi_IncomeFromContinuingOperationsAndDiscontinuedOperationsTax	7,110sigi_IncomeFromContinuingOperationsAndDiscontinuedOperationsTax
Unrealized holding gains during the period, Tax	8,391us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	11,538us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
HTM securities, Tax	(91)sigi_AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleTax	(160)sigi_AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleTax
Non-credit OTTI, Tax	125sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesTax
Realized gains on AFS securities, Tax	(6,963)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	(2,530)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Net unrealized gains, Tax	1,462sigi_TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax	8,848sigi_TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax
Amount reclassified into Net Income: Net actuarial loss, Tax	598us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	133us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Defined pension and other post-retirement benefit plans, tax	598us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	133us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other comprehensive income, Tax	2,060us-gaap_OtherComprehensiveIncomeLossTax	8,981us-gaap_OtherComprehensiveIncomeLossTax
Comprehensive Income Tax	18,642sigi_ComprehensiveIncomeLossTax	16,091sigi_ComprehensiveIncomeLossTax
Net income	39,708us-gaap_NetIncomeLoss	17,974us-gaap_NetIncomeLoss
Unrealized holding gains arising during period	15,586us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	21,426us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
HTM Securities	(170)sigi_AmortizationofNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetofTax	(296)sigi_AmortizationofNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetofTax
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments	232sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesNetOfTax	0sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesNetOfTax
Realized gains on available for sale securities	(12,932)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(4,699)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total unrealized gains on investment securities	2,716sigi_TotalUnrealizedGainsLossesonInvestmentSecurities	16,431sigi_TotalUnrealizedGainsLossesonInvestmentSecurities
Amount reclassified into Net Income: Net actuarial loss	1,111us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	247us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Total defined benefit pension and post-retirement plans	1,111us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	247us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income	3,827us-gaap_OtherComprehensiveIncomeLossNetOfTax	16,678us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income Loss Before Tax	62,177sigi_ComprehensiveIncomeLossBeforeTax	50,743sigi_ComprehensiveIncomeLossBeforeTax
Comprehensive income	$ 43,535us-gaap_ComprehensiveIncomeNetOfTax	$ 34,652us-gaap_ComprehensiveIncomeNetOfTax

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