Quarterly report pursuant to Section 13 or 15(d)

Servicing Assets - Additional Information (Detail)

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Servicing Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 535,600   $ 535,600   $ 539,600
Servicing fee income $ 1,300 $ 1,300 $ 4,000 $ 3,900  
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 $ 600 $ 600 $ 1,980 $ 1,815  
Fair value of servicing rights 8,000   8,000   $ 7,700
Residential mortgage loans $ 20,900   $ 20,900    
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     10.60%   14.40%
Prepayment speeds     11.30%   12.20%
Maximum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     28.80%   24.70%
Prepayment speeds     21.70%   19.70%