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Loans Held for Investment at Amortized Cost and Loans Held for Investment at Fair Value - Summary of UPB and Amortized Cost Basis of Loans in COVID-19 Forbearance Program (Details) - COVID 19 Forbearance Program - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]      
UPB Beginning balance $ 130,539 $ 142,827 $ 174,571
UPB Foreclosures (120) (1,980) (5,292)
UPB Repayments (1,076) (11,504) (26,452)
UPB Ending balance 129,343 129,343 142,827
UPB Performing/Accruing, Amount 97,771 97,771 102,769
UPB Nonperforming/Nonaccrual, Amount $ 31,572 $ 31,572 $ 40,058
UPB Performing/Accruing, Percentage 75.60% 75.60% 72.00%
UPB Nonperforming/Nonaccrual, Percentage 24.40% 24.40% 28.00%
Amortized Cost Beginning balance $ 131,790 $ 144,247 $ 176,515
Amortized Cost Foreclosures (120) (1,996) (5,416)
Amortized Cost Repayments (1,111) (11,692) (26,852)
Amortized Cost Ending balance 130,559 130,559 144,247
Amortized Cost Performing/Accruing, Amount 98,691 98,691 103,790
Amortized Cost Nonperforming/Nonaccrual, Amount $ 31,868 $ 31,868 $ 40,457
Amortized Cost Performing/Accruing, Percentage 75.60% 75.60% 72.00%
Amortized Cost Nonperforming/Nonaccrual, Percentage 24.40% 24.40% 28.00%