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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 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Accounts Notes And Loans Receivable [Line Items]    
UPB Beginning balance $ 126,142 $ 142,827
UPB Foreclosures   (1,980)
UPB Repayments (5,218) (14,705)
UPB Ending balance 120,924 126,142
UPB Performing/Accruing, Amount 93,631 96,577
UPB Nonperforming/Nonaccrual, Amount $ 27,293 $ 29,565
UPB Performing/Accruing, Percentage 77.40% 76.60%
UPB Nonperforming/Nonaccrual, Percentage 22.60% 23.40%
Amortized Cost Beginning balance $ 127,328 $ 144,247
Amortized Cost Foreclosures   (1,996)
Amortized Cost Repayments (5,294) (14,923)
Amortized Cost Ending balance 122,034 127,328
Amortized Cost Performing/Accruing, Amount 94,464 97,461
Amortized Cost Nonperforming/Nonaccrual, Amount $ 27,570 $ 29,867
Amortized Cost Performing/Accruing, Percentage 77.40% 76.50%
Amortized Cost Nonperforming/Nonaccrual, Percentage 22.60% 23.50%