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Derivative Instruments (Credit Exposure of Derivative Contracts) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Credit Exposure of Derivative Contracts    
Estimated fair value of derivatives in net asset (liability) position $ 190,889 $ 236,985
Derivative, Collateral, Right to Reclaim Cash [1] 1,111 1,441
Derivative Liability, Fair Value of Collateral [2] 76,173 95,863
Derivative, Collateral, Obligation to Return Cash [3] (194,125) (254,498)
Derivative Asset, Fair Value of Collateral [4] (18,439) (16,913)
Deposits with Clearing Organizations and Others, Securities [2] (66,063) (73,571)
Net credit exposure (10,454) (10,693)
Margin account related to exchange-traded futures [5] $ 9,474 $ 9,687
[1] Consists of receivable from counterparty, included in other assets.
[2] Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.
[3] Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[4] Consists of U.S. Treasury and government securities.
[5] Included in other assets.