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Allowance for Loan Losses - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) SecurityLoan | Sep. 30, 2015 SecurityLoan | Jun. 30, 2015 | Sep. 30, 2016 USD ($) SecurityLoan | Sep. 30, 2015 SecurityLoan | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  |  |  | 3 years |  |  |
Allowance for loan losses | $ 13,451 |  |  | $ 13,451 |  | $ 14,361 |
Proceeds from payoff on previously charged-off loans |  |  |  | $ 1,303 |  |  |
Allowance for loan losses look back period |  | 3 years | 2 years |  |  |  |
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 the borrower has made a minimum of six months payments under the modified terms; 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 |  |  |
Allowance for loan losses recorded for acquired loans |  |  |  | $ 97 |  | 123 |
Foreclosed assets | $ 62 |  |  | 62 |  | 116 |
Commercial and Agriculture [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Decreases allowance for loans |  |  |  | (625) |  |  |
TDRs [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | 214 |  |  | 214 |  | $ 286 |
Residential Mortgage [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Foreclosed assets | 62 |  |  | 62 |  |  |
Residential mortgages in process of foreclosure | $ 721 |  |  | $ 721 |  |  |

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