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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative Assets [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 164,774 $ 198,530
Gross Amounts Offset in the Balance Sheet (17,560) (20,258)
Net Amounts Presented in the Balance Sheet 147,214 178,272
Derivative Asset, Fair Value of Collateral [1] 0 (862)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received [2] (159,194) (185,900)
Net Amount (11,980) (8,490)
Derivative Liabilities [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 31,492 44,499
Gross Amounts Offset in the Balance Sheet (17,560) (20,258)
Net Amounts Presented in the Balance Sheet 13,932 24,241
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments [3] (61,293) (58,156)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received [4] (13,400) (22,221)
Net Amount $ (60,761) $ (56,136)
[1] Consists of U.S. Treasury and government securities.
[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.