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Offsetting Arrangement (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 454,731 $ 654,666
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 454,731 654,666
Financial Instruments 483,410 700,498
Cash Collateral Provided 1,980 1,980
Net Amount (30,659) (47,812)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 1,881 2,437
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 1,881 2,437
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount (99) 457
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 452,850 652,229
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 452,850 652,229
Financial Instruments 483,410 700,498
Cash Collateral Provided 0 0
Net Amount $ (30,560) $ (48,269)