Quarterly report [Sections 13 or 15(d)]

Servicing Assets - Additional Information (Detail)

v3.26.3
Servicing Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 611,500   $ 611,500   $ 615,900
Servicing fee income 1,400 $ 1,300 $ 2,800 $ 2,400  
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income  
Amortization expense 600 $ 500 $ 1,734 $ 1,873  
Fair value of servicing rights 9,400   9,400   8,500
Residential mortgage loans $ 35,800   $ 35,800   $ 62,500
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     11.00%   9.70%
Prepayment speeds     14.00%   20.20%
Maximum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     20.50%   18.90%
Prepayment speeds     29.40%   28.00%