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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Loans | Sep. 30, 2016 USD ($) Loans | Sep. 30, 2017 USD ($) Loans | Sep. 30, 2016 USD ($) Loans | Dec. 31, 2016 USD ($) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net unamortized loan (fees) costs | $ (2,744,000) |  | $ (2,744,000) |  | $ (1,507,000)
Percentage of comprised loan, commercial, industrial and agricultural loans | 32.00% |  | 32.00% |  | 30.00%
Percentage of comprised loan, commercial mortgage loans | 31.00% |  | 31.00% |  | 31.00%
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 | 33.00% |  | 33.00% |  | 35.00%
Number of Loans | Loans |  |  | 18 |  | 15
Minimum period to be considered for loan to have defaulted |  |  | 90 days |  |
Allowance for loan losses, period increase (decrease) | $ 169,000 | $ 0 | $ 1,324,000 | $ 0 |
Trouble Debt Restructuring [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loans | 4 | 0 | 4 | 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%
Minimum [Member] | Commercial And Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Individually evaluated for impairment threshold |  |  | $ 250,000 |  |

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