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Loan Servicing - Unpaid Principal Balance of Serviced Mortgage Loans for Others (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, end of period $ 118,818 $ 139,303
Mortgage loans sold to Federal Home Loan Mortgage Corporation without recourse    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, end of period 3,723 4,438
Mortgage loans sold to Federal National Mortgage Association without recourse    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, end of period 114,895 134,550
Mortgage loans sold to Federal Home Loan Bank without recourse    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, end of period $ 200 $ 315