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Borrowings and Related Interest (Schedule of Repurchase Agreements) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 240,000 $ 454,723
Maturity Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 50,000 214,723
Assets sold under agreements to repurchase, interest rate 1.72%  
Maturity Over 90 days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 190,000 $ 240,000
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 1.85% 1.72%
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% 2.86%