Quarterly report [Sections 13 or 15(d)]

Servicing Assets - Additional Information (Detail)

v3.25.3
Servicing Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 575,600   $ 575,600   $ 560,100
Servicing fee income $ 1,300 $ 1,300 $ 4,000 $ 4,000  
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income  
Amortization expense $ 500 $ 600 $ 1,873 $ 1,919  
Fair value of servicing rights 8,300   8,300   $ 7,900
Residential mortgage loans $ 32,600   $ 32,600    
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     11.20%   10.80%
Prepayment speeds     10.00%   15.40%
Maximum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     19.40%   27.30%
Prepayment speeds     27.60%   21.20%