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Borrowings and Related Interest (Schedule of Repurchase Agreements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 454,723 $ 192,500
Maturity Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase 214,723 0
Maturity Over 90 days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 240,000 $ 192,500
Minimum [Member] | Maturity Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate 2.45%  
Minimum [Member] | Maturity Over 90 days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate 1.42% 1.42%
Maximum [Member] | Maturity Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate 2.95%  
Maximum [Member] | Maturity Over 90 days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate 2.86% 1.85%