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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Loans | Sep. 30, 2015 Loans | Sep. 30, 2016 USD ($) Loans | Sep. 30, 2015 Loans | Dec. 31, 2015 USD ($) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net unamortized loan fees | $ | $ (824,000) |  | $ (824,000) |  | $ (636,000)
Percentage of comprised loan, commercial, industrial and agricultural loans | 32.00% |  | 32.00% |  | 30.00%
Percentage of comprised loan, commercial mortgage loans | 28.00% |  | 28.00% |  | 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 | 36.00% |  | 36.00% |  | 36.00%
Number of Loans | Loans |  |  | 15 |  | 16
Minimum period to be considered for loan to have defaulted |  |  | 90 days |  |
Principal balances forgiven in connection with loan restructuring | $ | $ 0 |  | $ 0 |  | $ 0
Outstanding balance of semi annual loans |  |  | Greater than $1 million |  |
Outstanding balance of annual loans |  |  | Less than $1 million |  |
Trouble Debt Restructuring [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loans | 1 | 0 | 1 | 0 |
Maximum [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum percentage of consumer loan and credit card in portfolio | 10.00% |  | 10.00% |  | 10.00%

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