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Offsetting Arrangement (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 284,177 $ 654,666
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 284,177 654,666
Financial Instruments 301,684 700,498
Cash Collateral Provided 1,980 1,980
Net Amount (19,487) (47,812)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 1,677 2,437
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 1,677 2,437
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount (303) 457
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 282,500 652,229
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 282,500 652,229
Financial Instruments 301,684 700,498
Cash Collateral Provided 0 0
Net Amount $ (19,184) $ (48,269)