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Non-performing Assets and Impaired Loans - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) ConsecutivePayment Contract | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |
Non-accrual loans | $ 13,276,000 | $ 7,936,000
Non-performing TDRs | $ 1,000,000 |
Loan delinquency period | 90 days |
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status | 6 months |
Restructured loan reported in TDRs | $ 3,000,000 |
Restructured loan returned to accruing status number of Consecutive Payments of loan | ConsecutivePayment | 6 |
Specific reserves allocated to troubled debt restructuring | $ 50,000 |
Number TDRs returned to accrual status | Contract | 2 |
Performing Financing Receivable [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Restructured loan reported in TDRs | $ 2,000,000 |
Principal Forgiveness [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Restructured loan reported in TDRs | 0 |
Loans Purchased With Evidence of Credit Deterioration [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non-accrual loans | 3,900,000 |
Non-performing TDRs | $ 467,000 |
Minimum [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loan delinquency period | 90 days |
Delay or shortfall in payments of loan | 30 days |
Loans with an aggregate credit exposure | $ 1,000,000 |
Loans classified as TDR after a period | 90 days |
Minimum [Member] | Good Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating | 5 years |
Number of years of Satisfactory Relationship with bank for Good Pass Rating | 5 years |
Number of consecutive years of profit for Good Pass Rating | 3 years |
Minimum [Member] | Satisfactory Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating | 2 years |
Maximum [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loans with an aggregate credit exposure | $ 3,500,000 |
Loans classified as TDR after a period | 120 days |

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