XML 117 R127.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Borrowings and Related Interest (Schedule of Repurchase Agreement by Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 190,000 $ 454,723
Maturity Less Than 90 Days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase 140,000 214,723
Maturity Over 90 days [Member]    
Debt Instrument [Line Items]    
Assets sold under agreements to repurchase $ 50,000 $ 240,000