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Allowance for Loan Losses - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
SecurityLoan
Dec. 31, 2018
USD ($)
SecurityLoan
Dec. 31, 2017
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Period for calculating Loss migration rates of portfolio segments 3 years    
Allowance for loan losses $ 14,767,000 $ 13,679,000  
Number of days past due for loans to be considered as nonperforming 90 days    
Reasonable period for nonperforming TDRs to be returned to performing status 6 months    
Number of days reaching where loans are considered for nonaccrual status 90 days    
Conditions where loans are considered for nonaccrual status A loan may be returned to accruing status only if one of three conditions are met: the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and the borrower has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months.    
Gross interest income recorded on nonaccrual loans $ 571,000 587,000 $ 712,000
Interest income on nonaccrual loans recognized on cash basis $ 379,000 $ 360,000 $ 139,000
Defaulted loans | SecurityLoan 0 0 0
Impaired loans greater than $350    
Foreclosed assets $ 0 $ 0  
Allowance for loan losses recorded for acquired loans 0 8,000  
Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Residential mortgages in process of foreclosure 1,022,000 311,000  
TDRs [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses $ 91,000 $ 141,000 $ 169,000