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Allowance for Loan Losses - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) SecurityLoan | Sep. 30, 2014 SecurityLoan | Jun. 30, 2015 | Sep. 30, 2015 USD ($) SecurityLoan | Sep. 30, 2014 SecurityLoan | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  |  |  | 3 years |  |
Allowance for loan losses | $ 14,760 |  |  | $ 14,760 |  | $ 14,268
Allowance for loan losses look back period | 3 years |  | 2 years |  |  |
Credit losses, unallocated reserves among total reserves |  | 7.10% |  |  | 7.10% |
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 $500 |  |
Foreclosed assets | $ 494 |  |  | $ 494 |  | 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) |  |
Residential Mortgage [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Foreclosed assets | 494 |  |  | 494 |  |
Residential mortgages in process of foreclosure | 669 |  |  | 669 |  |
TDRs [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 184 |  |  | $ 184 |  | $ 895

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