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Repurchase Agreements - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
counterparty
Dec. 31, 2020
USD ($)
Mar. 31, 2020
counterparty
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Repurchase agreement, number of counterparties | counterparty 14      
Weighted average months to maturity 73 days      
Accrued interest payable $ 8,800      
Cash and cash equivalents 118,763 $ 293,183   $ 103,724
Unencumbered securities $ 535,827      
Liquidation proceeds (as a percent) 27.80%      
Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Weighted average interest rate (as a percent) 2.72%      
Residential Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Repurchase agreement, number of counterparties | counterparty     1