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Borrowings and Related Interest (Schedule of Repurchase Agreements) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 50,000 $ 190,000
Short-term [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase 0 140,000
Long-term [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 50,000 $ 50,000
Minimum [Member] | Short-term [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate   1.85%
Minimum [Member] | Long-term [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate 1.85% 1.85%
Maximum [Member] | Short-term [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate   2.70%
Maximum [Member] | Long-term [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase, interest rate 2.86% 2.86%