Quarterly report pursuant to Section 13 or 15(d)

Servicing Assets - Additional Information (Detail)

v3.21.1
Servicing Assets - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Serviced loans sold to unaffiliated parties $ 432,400,000   $ 429,400,000
Amortization expense 512,000 $ 583,000  
Fair value of servicing rights $ 7,400,000   $ 6,900,000
Minimum      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Discount rates ranging 7.30%   9.30%
Prepayment speeds 11.50%   11.80%
Maximum [Member]      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Discount rates ranging 10.30%   12.20%
Prepayment speeds 18.80%   19.10%
Other Operating Income      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Servicing fee income $ 1,300,000 $ 1,000,000.0