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Fair Value (Schedule Of Realized Gains (Losses) Using Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dividends and Other Investment Income (Loss) [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Realized gains (losses) from Level 3 inputs $ 4 $ 0 $ 4 $ 34  
Fixed Income Securities Gains (Losses), Net [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Realized gains (losses) from Level 3 inputs (137,349) 4,383 (137,641) 35,297  
Level 3 Equity Securities Gains (Losses), Net [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Realized gains (losses) from Level 3 inputs (674) 0 (674) 0  
US States and Political Subdivisions Debt Securities [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value Assets Measured On Recurring Basis And Gain Loss Included In Fixed Income Securities Gains (Losses), Net (375)   (344) 16  
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Accretion Of Purchase Discount On Securities Available-For-Sale 1 $ 8 3 18  
Trust Preferred Securities Real Estate Investment Trusts [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value Assets Measured On Recurring Basis And Gain Loss Included In Fixed Income Securities Gains (Losses), Net       $ 1,399  
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Accretion Of Purchase Discount On Securities Available-For-Sale          
Estimate of Fair Value Measurement [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other Liabilities, Fair Value Disclosure         $ 13
Estimate of Fair Value Measurement [Member] | Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other Assets, Fair Value Disclosure 89,729   89,729   88,878
Other Liabilities, Fair Value Disclosure $ 89,729   $ 89,729   $ 88,878