Annual report pursuant to Section 13 and 15(d)

Servicing Assets - Additional Information (Detail)

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Servicing Assets - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Serviced loans sold to unaffiliated parties $ 422,300 $ 448,600  
Servicing fee income 4,400 4,700 $ 4,700
Net amortization expense 2,800 2,600 2,400
Fair value of servicing rights $ 6,956 $ 8,520 $ 10,218
Minimum      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Discount rates ranging 7.70%    
Prepayment speeds 1.80%    
Maximum      
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]      
Discount rates ranging 21.40%    
Prepayment speeds 15.60%