Quarterly report pursuant to Section 13 or 15(d)

Servicing Assets - Additional Information (Detail)

v3.21.2
Servicing Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Serviced loans sold to unaffiliated parties $ 432,800,000   $ 432,800,000   $ 429,400,000
Amortization expense 658,000 $ 540,000 1,200,000 $ 1,100,000  
Fair value of servicing rights 7,900,000   $ 7,900,000   $ 6,900,000
Minimum          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     6.90%   9.30%
Prepayment speeds     11.20%   11.80%
Maximum [Member]          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Discount rates ranging     8.40%   12.20%
Prepayment speeds     18.10%   19.10%
Other Operating Income          
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]          
Servicing fee income $ 1,100,000 $ 1,200,000 $ 2,300,000 $ 2,300,000