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Loans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net unamortized loan fees | $ 3,175,000 | $ 3,157,000 |
Percentage of comprised loan, commercial, industrial and agricultural loans | 37.00% | 33.00% |
Percentage of comprised loan, commercial mortgage loans | 28.00% | 30.00% |
Percentage of loan-to-value to business equipment (up to) | 80.00% |  |
Percentage of loan-to-value to accounts receivable (up to) | 75.00% |  |
Percentage of loan-to-value to business inventory (up to) | 60.00% |  |
Percentage of loan-to-value to real estate (up to) | 85.00% |  |
Percentage of residential real estate loan in portfolio | 31.00% | 33.00% |
Allowance for loan losses, period increase (decrease) | $ 351,000 | $ 4,024,000 | $ 0
Minimum period to be considered for loan to have defaulted | 90 days |  |
Principal balances forgiven in connection with loan restructuring | $ 0 | $ 0 |
Number of loans | loan | 25 | 20 |
Modified in a troubled debt restructuring | $ 14,626,000 | $ 17,303,000 |
Charge-offs | $ 6,593,000 | $ 4,077,000 | $ 4,961,000
Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Maximum percentage of consumer loan and credit card in portfolio | 4.00% | 4.00% |
Reduction in stated interest rate modification having loan range period | 18 years |  |
Extension of maturity date modification having loan range period | 18 years |  |
Minimum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Reduction in stated interest rate modification having loan range period | 4 years |  |
Extension of maturity date modification having loan range period | 4 years |  |
Commercial and Industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan |  | 4 | 1
Modified in a troubled debt restructuring |  | $ 2,750,000 | $ 109,000
Charge-offs |  | $ 0 | $ 0
Commercial Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan | 5 | 2 |
Modified in a troubled debt restructuring | $ 1,677,000 | $ 6,421,000 |
Additional provision for loan losses | 351,000 | 3,895,000 |
Charge-offs | $ 0 | $ 0 |
Troubled Debt Restructuring, Debtor, Prior Period | Commercial Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan | 1 |  |
Additional provision for loan losses | $ 1,847,000 |  |
Charge-offs | $ 3,336,000 |  |

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