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Offsetting Arrangement (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 388,058 $ 193,781
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 388,058 193,781
Financial Instruments 412,677 205,483
Cash Collateral Provided 1,980 1,980
Net Amount (26,599) (13,682)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 679 1,281
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 679 1,281
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount (1,301) (699)
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 387,379 192,500
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 387,379 192,500
Financial Instruments 412,677 205,483
Cash Collateral Provided 0 0
Net Amount $ (25,298) $ (12,983)