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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative Asset [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 247,069 $ 198,530
Derivative Asset, Fair Value, Gross Liability (18,581) (20,258)
Derivative Asset 228,488 178,272
Derivative Asset, Fair Value of Collateral [1] 0 (862)
Derivative, Collateral, Obligation to Return Cash (235,611) (185,900)
Derivative Asset, Fair Value, Amount Offset Against Collateral (7,123) (8,490)
Derivative Liability [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 46,030 44,499
Derivative Liability, Fair Value, Gross Asset (18,581) (20,258)
Derivative Liability 27,449 24,241
Derivative Liability, Fair Value of Collateral [1] (71,376) (58,156)
Derivative, Collateral, Right to Reclaim Cash (24,080) (22,221)
Derivative Liability, Fair Value, Amount Offset Against Collateral $ (68,007) $ (56,136)
[1] Includes initial margin posted to a central clearing partner.