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Allowance for Loan Losses - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) SecurityLoan | Sep. 30, 2017 SecurityLoan | Sep. 30, 2018 USD ($) SecurityLoan | Sep. 30, 2017 SecurityLoan | Dec. 31, 2017 USD ($) | Sep. 14, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  |  | 3 years |  |  |
Allowance for loan losses | $ 13,331 |  | $ 13,331 |  | $ 13,134 |
Number of days past due for loans to be considered as nonperforming |  |  | 90 days |  |  |
Reasonable period for nonperforming TDRs to be returned to performing status |  |  | 6 months |  |  |
Number of days reaching where loans are considered for nonaccrual status |  |  | 90 days |  |  |
Conditions where loans are considered for nonaccrual status |  |  | A loan may be returned to accruing status only if one of three conditions are met: the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months. |  |  |
Defaulted loans | SecurityLoan | 0 | 0 | 0 | 0 |  |
Impaired loans |  |  | greater than $350 |  |  |
Loans acquired with credit deterioration |  |  |  |  |  | $ 878
Allowance for loan losses recorded for acquired loans |  |  | $ 30 |  | 126 |
Foreclosed assets | $ 0 |  | 0 |  | 16 |
Residential Mortgage [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Residential mortgages in process of foreclosure | 286 |  | 286 |  | 239 |
TDRs [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 171 |  | $ 171 |  | $ 169 |

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