Quarterly report pursuant to Section 13 or 15(d)

Servicing Assets - Additional Information (Detail)

v3.23.3
Servicing Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 531,600   $ 531,600   $ 523,600
Servicing fee income $ 1,300 $ 1,300 $ 3,900 $ 3,700  
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 $ 800 $ 1,815 $ 2,033  
Fair value of servicing rights $ 7,600   $ 7,600   $ 7,100
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     15.40%   21.90%
Prepayment speeds     11.90%   10.80%
Maximum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     26.80%   25.30%
Prepayment speeds     18.80%   16.70%