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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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.

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