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Offsetting Arrangement (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 654,666 $ 939,757
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 654,666 939,757
Financial Instruments 700,498 1,021,370
Cash Collateral Provided 1,980 1,980
Net Amount (47,812) (83,593)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 2,437 7,257
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 2,437 7,257
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount 457 5,277
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 652,229 932,500
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 652,229 932,500
Financial Instruments 700,498 1,021,370
Cash Collateral Provided 0 0
Net Amount $ (48,269) $ (88,870)