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Offsetting Financial Assets and Liabilities (Liabilities Offsetting) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 431,396 $ 455,056
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 431,396 455,056
Financial Instruments 461,092 487,181
Cash Collateral Provided 1,980 1,980
Net Amount (31,676) (34,105)
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 439 333
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 439 333
Financial Instruments 0 0
Cash Collateral Provided 1,980 1,980
Net Amount (1,541) (1,647)
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 430,957 454,723
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 430,957 454,723
Financial Instruments 461,092 487,181
Cash Collateral Provided 0 0
Net Amount $ (30,135) $ (32,458)