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Subsequent Events - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Nov. 30, 2025
Oct. 31, 2025
Feb. 28, 2021
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Subsequent Event [Line Items]            
Advances on securitizations       $ 265,000,000 $ 187,305,000  
Amount authorized under stock repurchase program           $ 30,000,000
Stock repurchase program expiration date       Dec. 31, 2026    
RMIT 2021-1            
Subsequent Event [Line Items]            
Advances on securitizations     $ 249,000,000      
Subsequent Event            
Subsequent Event [Line Items]            
Amount authorized under stock repurchase program $ 60,000,000          
Increase in stock repurchase program, authorized, amount $ 30,000,000          
Stock repurchase program expiration date Jun. 30, 2027          
Subsequent Event | RMIT 2025-2            
Subsequent Event [Line Items]            
Advances on securitizations   $ 253,000,000        
Subsequent Event | Quarterly Cash Dividend            
Subsequent Event [Line Items]            
Cash dividend per share $ 0.3          
Dividends payable, date to be paid Dec. 16, 2025          
Dividend date of record Nov. 25, 2025          
Dividend date of declaration 2025-11