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Offsetting of Financial Assets and Liabilities (Offsetting Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 1,712 $ 190,913
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 1,712 190,913
Financial Instruments 0 204,068
Cash Collateral Provided 0 0
Net Amount 1,712 (13,155)
Derivatives [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 1,712 913
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 1,712 913
Financial Instruments 0 0
Cash Collateral Provided 0 0
Net Amount $ 1,712 913
Securities Sold Under Agreements To Repurchase [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities   190,000
Gross amount Offset in the Statement of Financial Condition   0
Net Amount of Liabilities Presented in the Statement of Financial Condition   190,000
Financial Instruments   204,068
Cash Collateral Provided   0
Net Amount   $ (14,068)