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Allowance for Loan Losses - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired loans measurement     Impaired loans measured individually for impairment generally include (1) any loan risk rated substandard or worse with balances of $400 thousand or more, and (2) all loans designated as TDRs.    
Loan Receivables $ 1,056,733,000   $ 1,056,733,000   $ 924,503,000
Provision for loan losses 869,000 $ 495,000 5,673,000 $ 871,000  
Increase in gross loans     71,900,000    
Loans designated as TDRs subsequently defaulted     0    
Paycheck Protection Program          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses     0    
Substandard          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan Receivables 18,875,000   18,875,000   $ 8,709,000
Minimum | Substandard          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan Receivables 400,000   400,000    
Maximum | Substandard          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan Receivables $ 400,000   $ 400,000