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Parent Corporation Balance Sheets (Parenthetical) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Debt Securities, Amortized Cost	$ 3,975,786us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis	$ 3,675,977us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Preferred stock, par value per share	$ 0us-gaap_PreferredStockParOrStatedValuePerShare	$ 0us-gaap_PreferredStockParOrStatedValuePerShare	$ 0us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock, par value per share	$ 2us-gaap_CommonStockParOrStatedValuePerShare	$ 2us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	360,000,000us-gaap_CommonStockSharesAuthorized	360,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	99,947,933us-gaap_CommonStockSharesIssued	99,120,235us-gaap_CommonStockSharesIssued
Treasury stock, shares	43,353,181us-gaap_TreasuryStockShares	43,198,622us-gaap_TreasuryStockShares
Parent Company [Member]
Available-for-sale Debt Securities, Amortized Cost	$ 49,890us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 55,447us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock, par value per share	$ 0us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 0us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	5,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, par value per share	$ 2us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 2us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, shares authorized	360,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	360,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, shares issued	99,947,933us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	99,120,235us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Treasury stock, shares	43,353,181us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	43,198,622us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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