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v2.4.1.9

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

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