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Offsetting Arrangement (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 378,430 $ 193,781
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 378,430 193,781
Financial Instruments 402,225 205,483
Cash Collateral Provided 1,980 1,980
Net Amount (25,775) (13,682)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 622 1,281
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 622 1,281
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount (1,358) (699)
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 377,808 192,500
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 377,808 192,500
Financial Instruments 402,225 205,483
Cash Collateral Provided 0 0
Net Amount $ (24,417) $ (12,983)