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Borrowings and Related Interest (Schedule of Repurchase Agreement by Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 50,000 $ 190,000
Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase 0 140,000
Over 90-days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 50,000 $ 50,000