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Loans - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net unamortized loan fees $ 2,952,000   $ 2,952,000   $ 2,574,000
Percentage of comprised loan, commercial, industrial and agricultural loans 35.00%   35.00%   35.00%
Percentage of comprised loan, commercial mortgage loans 30.00%   30.00%   28.00%
Percentage of loan-to-value to business equipment     80.00%    
Percentage of loan-to-value to accounts receivable     75.00%    
Percentage of loan-to-value to business inventory     60.00%    
Percentage of loan-to-value to real estate     85.00%    
Percentage of residential real estate loan in portfolio 32.00%   32.00%   33.00%
Principal balances forgiven in connection with loan restructuring   $ 0   $ 0  
Number of loans | loan 4 0 4 0  
Increase in allowance for loans losses $ 129,000   $ 129,000    
Outstanding balance of semi annual loans (greater than) 1,000,000   1,000,000    
Outstanding balance of annual loans (less than) $ 1,000,000   $ 1,000,000    
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Maximum percentage of consumer loan and credit card in portfolio (less than) 10.00%   10.00%   10.00%