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Repurchase Agreements - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2022
USD ($)
counterparty
financialInstitution
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]      
Cash and cash equivalents $ 355,276 $ 289,602 $ 408,785
Repurchase agreements, number of financial institutions | financialInstitution 4    
Repurchase agreements, number of counterparties | counterparty 1    
Financings under repurchase agreements, aggregate outstanding balance $ 542,700    
Number of counterparties with amounts outstanding under repurchase agreements | counterparty 1    
Bank of America      
Assets Sold under Agreements to Repurchase [Line Items]      
Repurchase agreement percentage at risk 6.62%    
Repurchase agreements      
Assets Sold under Agreements to Repurchase [Line Items]      
Cash and cash equivalents $ 336,700    
Unencumbered investment securities $ 121,510    
Average days to maturity 7 days    
Weighted average interest rate 3.71%    
Accrued interest payable $ 500    
Weighted average advance rate 30.00%    
Average interest rate haircut 70.00%    
Repurchase agreements | Residential loans      
Assets Sold under Agreements to Repurchase [Line Items]      
Unencumbered investment securities $ 221,700