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Loans Held for Investment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]    
Accrued interest receivable $ 0.9 $ 0.4
Financing Receivable | Product Concentration Risk | Property - Buy to Let    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Concentration risk percentage 99.90% 98.60%