v3.26.1
Servicing Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 619,600   $ 619,600   $ 615,900
Servicing fee income 1,400 $ 1,300 $ 2,800 $ 2,600  
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 500 $ 700 $ 1,153 $ 1,335  
Fair value of servicing rights 9,100   9,100   8,500
Residential mortgage loans $ 55,700   $ 55,700   $ 62,500
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     6.80%   9.70%
Prepayment speeds     13.80%   20.20%
Maximum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     20.40%   18.90%
Prepayment speeds     30.10%   28.00%