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Borrowings and Related Interest (Schedule of Repurchase Agreement by Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 430,957 $ 454,723
Maturity Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase 190,957 214,723
Maturity Over 90 days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 240,000 $ 240,000