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Allowance for Loan Losses - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired loans measurement Impaired loans measured for impairment generally include (1) any loan risk rated Special Mention or worse where the borrower has filed for bankruptcy; and (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 $ 854,359,000 $ 766,296,000  
Percentage of excess loan balance for watch category 90.00%    
Loans modified as TDRs $ 0   $ 0
Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan Receivables $ 8,147,000 $ 11,371,000  
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days loans are past due 90 days    
Minimum | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan Receivables $ 400,000