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Loans Held for Investment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Receivables [Abstract]            
Commitments to purchase or sell $ 0.0 $ 0.0 $ 0.0 $ 0.0    
Proceeds from sale of loans held-for-investment 0.0 0.0 0.0 0.0    
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default         $ 2.1 $ 1.3
Accrued interest reversal (0.4) (0.4) (2.9) (2.4)    
Financing Receivable, Excluding Accrued Interest, Modified Period $ 43.0 $ 31.7 $ 63.5 $ 89.4