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Loans - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
SecurityLoan
Dec. 31, 2018
USD ($)
SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Net discount on loans $ 12,315,000 $ 18,811,000
Impaired loans 5,664,000 7,865,000
Unearned income 3,114,000 2,716,000
Financing receivable, recorded investment, 90 days past due and still accruing 0 0
Accrued interest receivable for loans 6,575,000 7,017,000
Unfunded commitments to borrowers whose loans had been modified $ 0 $ 0
Residential mortgages    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of modified loans with subsequent default within twelve months | SecurityLoan 2 6
Modified loans that subsequently defaulted within twelve months $ 617,000 $ 619,000
Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of modified loans with subsequent default within twelve months | SecurityLoan 2 2
Modified loans that subsequently defaulted within twelve months $ 10,000 $ 32,000
Commercial real estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of modified loans with subsequent default within twelve months | SecurityLoan   4
Modified loans that subsequently defaulted within twelve months   $ 7,022,000
Number of defaulted loans individually evaluated for impairment | SecurityLoan 2  
Defaulted loans individually evaluated for impairment $ 6,910,000  
Commercial and industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of modified loans with subsequent default within twelve months | SecurityLoan   2
Modified loans that subsequently defaulted within twelve months   $ 714,000