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Offsetting Arrangement (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 274,252 $ 193,781
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 274,252 193,781
Financial Instruments 293,068 205,483
Cash Collateral Provided 1,980 1,980
Net Amount (20,796) (13,682)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 752 1,281
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 752 1,281
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount (1,228) (699)
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 273,500 192,500
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 273,500 192,500
Financial Instruments 293,068 205,483
Cash Collateral Provided 0 0
Net Amount $ (19,568) $ (12,983)