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Allowance for Loan Losses - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 USD ($) | Jun. 30, 2015 | Dec. 31, 2015 USD ($) SecurityLoan Loans | Dec. 31, 2014 USD ($) SecurityLoan | Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments | 3 years | 3 years |  |  |  |
Allowance for loan losses |  | $ 14,361 |  | $ 14,361 | $ 14,268 |
Allowance for loan losses look back period | 3 years |  | 2 years |  |  |
Number of loans charged off | Loans |  |  |  | 11 |  |
Provision for loan losses |  |  |  | $ 1,200 | 1,500 | $ 1,100
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 |  | 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; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months. |  |
Gross interest income recorded on nonaccrual loans |  |  |  | $ 1,761 | 1,477 | $ 1,783
Interest income on nonaccrual loans actually included in net income |  | 766 |  | $ 766 | $ 719 | 1,155
Defaulted loans | SecurityLoan |  |  |  | 1 | 0 |
Impaired loans |  |  |  | Greater than $350 |  |
Loans acquired with credit deterioration |  | 831 |  | $ 831 |  |
Allowance for loan losses recorded for acquired loans |  |  |  | 123 |  |
Foreclosed assets |  | 116 |  | $ 116 | $ 560 |
Scenario, Previously Reported [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments | 2 years |  |  |  |  |
Purchased Automobile Loans Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  |  |  | 2 years |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Decreases allowance for loans |  |  |  | $ (625) |  |
Provision for loan losses |  |  |  | (333) | (932) | 369
Residential Mortgage [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Foreclosed assets |  | 116 |  | 116 |  |
Residential mortgages in process of foreclosure |  | 340 |  | 340 |  |
TDRs [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  | $ 286 |  | 286 | $ 895 | $ 750
Company Collateral [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Provision for loan losses |  |  |  | $ 1,436 |  |

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