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Allowance for Loan Losses - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired loans measurement     Impaired loans measured individually for impairment generally include (1) any loan risk rated Special Mention or worse where the borrower has filed for bankruptcy; (2) all loans risk rated Substandard or worse with balances of $400 thousand or more; and (3) all loans classified as a troubled debt restructuring (“TDR”).    
Loan Receivables $ 932,032,000   $ 932,032,000   $ 902,345,000
Loans modified as TDRs 0 $ 0 0 $ 0  
Substandard          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan Receivables 11,318,000   11,318,000   $ 9,587,000
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