XML 56 R45.htm IDEA: XBRL DOCUMENT v3.10.0.1
Loans - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net unamortized loan fees $ 3,331,000   $ 3,331,000   $ 2,574,000
Percentage of comprised loan, commercial, industrial and agricultural loans 36.00%   36.00%   35.00%
Percentage of comprised loan, commercial mortgage loans 29.00%   29.00%   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 $ 0 $ 0  
Increase in allowance for loans losses     113,000    
Allowance for loan and lease losses write-offs     $ 0    
Increase in allowance for loan losses   $ 169,000   $ 1,324,000  
Number of loans | loan 4 4 4 4  
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%