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Quarterly Financial Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 13, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net premiums earned   $ 469,850us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 462,639us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 463,625us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 456,495us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 451,312us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 437,568us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 426,252us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 420,940us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 1,852,609us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 1,736,072us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 1,584,119us-gaap_PremiumsEarnedNetPropertyAndCasualty
Net Investment Income   32,108us-gaap_NetInvestmentIncome 34,292us-gaap_NetInvestmentIncome 36,774us-gaap_NetInvestmentIncome 35,534us-gaap_NetInvestmentIncome 35,313us-gaap_NetInvestmentIncome 32,457us-gaap_NetInvestmentIncome 34,003us-gaap_NetInvestmentIncome 32,870us-gaap_NetInvestmentIncome 138,708us-gaap_NetInvestmentIncome 134,643us-gaap_NetInvestmentIncome 131,877us-gaap_NetInvestmentIncome
Net realized gains (losses)   (389)us-gaap_GainLossOnSaleOfSecuritiesNet 15,231us-gaap_GainLossOnSaleOfSecuritiesNet 4,539us-gaap_GainLossOnSaleOfSecuritiesNet 7,218us-gaap_GainLossOnSaleOfSecuritiesNet (1,208)us-gaap_GainLossOnSaleOfSecuritiesNet 13,431us-gaap_GainLossOnSaleOfSecuritiesNet 5,154us-gaap_GainLossOnSaleOfSecuritiesNet 3,355us-gaap_GainLossOnSaleOfSecuritiesNet 37,703us-gaap_GainLossOnSaleOfSecuritiesNet 26,375us-gaap_GainLossOnSaleOfSecuritiesNet 13,252us-gaap_GainLossOnSaleOfSecuritiesNet
Underwriting gain (loss), before federal income tax   38,637sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes 34,437sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes 10,084sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes (5,015)sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes 11,971sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes 10,151sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes 4,483sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes 12,161sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes      
Net income from continuing operations   41,350us-gaap_IncomeLossFromContinuingOperations 53,162us-gaap_IncomeLossFromContinuingOperations 29,341us-gaap_IncomeLossFromContinuingOperations 17,974us-gaap_IncomeLossFromContinuingOperations 25,335us-gaap_IncomeLossFromContinuingOperations 32,653us-gaap_IncomeLossFromContinuingOperations 27,122us-gaap_IncomeLossFromContinuingOperations 22,305us-gaap_IncomeLossFromContinuingOperations 141,827us-gaap_IncomeLossFromContinuingOperations 107,415us-gaap_IncomeLossFromContinuingOperations 37,963us-gaap_IncomeLossFromContinuingOperations
Loss on disposal of discontinued operations, net of tax   0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (997)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax      
Net income   41,350us-gaap_NetIncomeLoss 53,162us-gaap_NetIncomeLoss 29,341us-gaap_NetIncomeLoss 17,974us-gaap_NetIncomeLoss 25,335us-gaap_NetIncomeLoss 32,653us-gaap_NetIncomeLoss 27,122us-gaap_NetIncomeLoss 21,308us-gaap_NetIncomeLoss 141,827us-gaap_NetIncomeLoss 106,418us-gaap_NetIncomeLoss 37,963us-gaap_NetIncomeLoss
Other comprehensive income (loss)   (29,337)us-gaap_OtherComprehensiveIncomeLossNetOfTax (18,887)us-gaap_OtherComprehensiveIncomeLossNetOfTax 26,483us-gaap_OtherComprehensiveIncomeLossNetOfTax 16,678us-gaap_OtherComprehensiveIncomeLossNetOfTax 7,768us-gaap_OtherComprehensiveIncomeLossNetOfTax (2,195)us-gaap_OtherComprehensiveIncomeLossNetOfTax (62,643)us-gaap_OtherComprehensiveIncomeLossNetOfTax 27,881us-gaap_OtherComprehensiveIncomeLossNetOfTax (5,063)us-gaap_OtherComprehensiveIncomeLossNetOfTax (29,189)us-gaap_OtherComprehensiveIncomeLossNetOfTax 11,746us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income   12,013us-gaap_ComprehensiveIncomeNetOfTax 34,275us-gaap_ComprehensiveIncomeNetOfTax 55,824us-gaap_ComprehensiveIncomeNetOfTax 34,652us-gaap_ComprehensiveIncomeNetOfTax 33,103us-gaap_ComprehensiveIncomeNetOfTax 30,458us-gaap_ComprehensiveIncomeNetOfTax (35,521)us-gaap_ComprehensiveIncomeNetOfTax 49,189us-gaap_ComprehensiveIncomeNetOfTax 136,764us-gaap_ComprehensiveIncomeNetOfTax 77,229us-gaap_ComprehensiveIncomeNetOfTax 49,709us-gaap_ComprehensiveIncomeNetOfTax
Basic net income per share   $ 0.73us-gaap_EarningsPerShareBasic $ 0.94us-gaap_EarningsPerShareBasic $ 0.52us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.45us-gaap_EarningsPerShareBasic $ 0.59us-gaap_EarningsPerShareBasic $ 0.49us-gaap_EarningsPerShareBasic $ 0.38us-gaap_EarningsPerShareBasic $ 2.52us-gaap_EarningsPerShareBasic $ 1.91us-gaap_EarningsPerShareBasic $ 0.69us-gaap_EarningsPerShareBasic
Diluted net income per share   $ 0.72us-gaap_EarningsPerShareDiluted $ 0.93us-gaap_EarningsPerShareDiluted $ 0.51us-gaap_EarningsPerShareDiluted $ 0.31us-gaap_EarningsPerShareDiluted $ 0.44us-gaap_EarningsPerShareDiluted $ 0.57us-gaap_EarningsPerShareDiluted $ 0.48us-gaap_EarningsPerShareDiluted $ 0.38us-gaap_EarningsPerShareDiluted $ 2.47us-gaap_EarningsPerShareDiluted $ 1.87us-gaap_EarningsPerShareDiluted $ 0.68us-gaap_EarningsPerShareDiluted
Dividends to stockholders   $ 0.14us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.13us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.53us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared
Price range common stock, high 28.08sigi_StockMarketPriceHigh 27.65sigi_StockMarketPriceHigh [2] 25.46sigi_StockMarketPriceHigh [2] 25.42sigi_StockMarketPriceHigh [2] 26.99sigi_StockMarketPriceHigh [2] 28.31sigi_StockMarketPriceHigh [2] 25.95sigi_StockMarketPriceHigh [2] 24.75sigi_StockMarketPriceHigh [2] 24.13sigi_StockMarketPriceHigh [2]      
Price range of common stock, low 25.49sigi_StockMarketPriceLow 22.01sigi_StockMarketPriceLow [2] 21.97sigi_StockMarketPriceLow [2] 22.14sigi_StockMarketPriceLow [2] 21.38sigi_StockMarketPriceLow [2] 23.55sigi_StockMarketPriceLow [2] 22.61sigi_StockMarketPriceLow [2] 19.58sigi_StockMarketPriceLow [2] 19.53sigi_StockMarketPriceLow [2]      
Accumulated other comprehensive income (loss) [Member]                        
Other comprehensive income (loss)                   $ (5,063)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (29,189)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ 11,746us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1] 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.
[2] 2 These ranges of high and low prices of the Parent’s common stock, as reported by the NASDAQ Global Select Market, represent actual transactions. Price quotations do not include retail markups, markdowns, and commissions. The range of high and low prices for common stock for the period beginning January 2, 2015 and ending February 13, 2015 was $25.49 to $28.08.