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Borrowings and Related Interest (Schedule of Repurchase Agreements) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Assets sold under agreements to repurchase $ 190,000
Short-term [Member]  
Debt Instrument [Line Items]  
Assets sold under agreements to repurchase 140,000
Long-term [Member]  
Debt Instrument [Line Items]  
Assets sold under agreements to repurchase $ 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%
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%