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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivative Asset [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 301,270 $ 238,804
Derivative Asset, Fair Value, Gross Liability (30,096) (14,111)
Derivative Asset 271,174 224,693
Derivative Asset, Fair Value of Collateral [1] (20,888) (20,260)
Derivative, Collateral, Obligation to Return Cash [2] (245,038) (178,141)
Derivative Asset, Fair Value, Amount Offset Against Collateral 5,248 26,292
Derivative Liability [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 54,921 56,665
Derivative Liability, Fair Value, Gross Asset (30,096) (14,111)
Derivative Liability 24,825 42,554
Derivative Liability, Fair Value of Collateral [3] (47,149) (47,222)
Derivative, Collateral, Right to Reclaim Cash [4] (12,540) 0
Derivative Liability, Fair Value, Amount Offset Against Collateral $ (34,864) $ (4,668)
[1] Consists of U.S. Treasury
[2] Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[3] Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.
[4] Consists of receivable from counterparty, included in other assets.