Quarterly report pursuant to Section 13 or 15(d)

Servicing Assets - Additional Information (Detail)

v3.22.2.2
Servicing Assets - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 505,200,000   $ 505,200,000   $ 473,500,000
Servicing fee income $ 1,300,000 $ 1,100,000 $ 3,700,000 $ 3,400,000  
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 $ 758,000 $ 532,000 $ 2,000,000.0 $ 1,700,000  
Fair value of servicing rights $ 7,700,000   $ 7,700,000   $ 8,100,000
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     15.60%   10.40%
Prepayment speeds     11.00%   10.20%
Maximum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     18.30%   16.70%
Prepayment speeds     17.00%   12.80%