v3.26.1
Transactions with Related Parties - Mortgage Banking Services Agreement - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2024
2020 MBS Agreement [Member]    
Mortgage Loans On Real Estate [Line Items]    
Servicing agreement expiration date Dec. 31, 2029  
Service agreement maturity renewal term 18 months  
2020 MBS Agreement [Member] | Fannie Mae Or Freddie Mac Mortgage Loans [Member]    
Mortgage Loans On Real Estate [Line Items]    
Number of mortgage loans purchased multiplier $ 500  
2020 MBS Agreement [Member] | Maximum [Member]    
Mortgage Loans On Real Estate [Line Items]    
Mortgage loans commitments multiplier 585  
Mortgage adjusted loan commitments 16,500  
Number of mortgage loans purchased multiplier 315  
Number of mortgage loans purchased $ 16,500  
Interest income and sourcing fee 2.00%  
2020 MBS Agreement [Member] | Minimum [Member]    
Mortgage Loans On Real Estate [Line Items]    
Mortgage loans commitments multiplier $ 355  
Mortgage adjusted loan commitments 16,500  
Number of mortgage loans purchased multiplier 195  
Number of mortgage loans purchased $ 16,500  
Interest income and sourcing fee 1.00%  
2020 MBS Agreement Renewed and Amended [Member]    
Mortgage Loans On Real Estate [Line Items]    
Percentage of right to purchase non-government insured or guaranteed loans   100.00%