Annual report pursuant to Section 13 and 15(d)

Servicing Assets - Additional Information (Detail)

v3.20.4
Servicing Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Serviced loans sold to unaffiliated parties $ 429.4 $ 422.3  
Fair value of servicing rights $ 6.9    
Minimum      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Discount rates ranging 9.30%    
Prepayment speeds 11.80%    
Maximum      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Discount rates ranging 12.20%    
Prepayment speeds 19.10%    
Other Operating Income      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Servicing fee income $ 4.2 4.4 $ 4.7
Net amortization expense $ 2.0 $ 2.8 $ 2.6