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Repurchase Agreements - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
counterparty
Sep. 30, 2020
USD ($)
Mar. 31, 2020
counterparty
Sep. 30, 2019
USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Repurchase agreements, number of counterparties | counterparty 14      
Average days to maturity 73 days      
Interest payable $ 8,800      
Cash and cash equivalents 118,763 $ 649,822   $ 65,906
Unencumbered investment securities $ 535,827      
Liquidation proceeds, percentage 27.80%      
Residential loans        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Repurchase agreements, number of counterparties | counterparty     1  
Deferred finance costs, gross $ 800 $ 1,300    
Loans        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Weighted average interest rate 2.72%