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Allowance for Loan Losses - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) SecurityLoan | Sep. 30, 2015 | Mar. 31, 2015 SecurityLoan | Dec. 31, 2014 | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments | 3 years |  |  |  |
Allowance for loan losses | $ 14,433 |  |  |  | $ 14,361
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 |  |
Impaired loans | Greater than $350 |  |  |  |
Allowance for loan losses recorded for acquired loans | $ 113 |  |  |  |
Foreclosed assets | 57 |  |  |  | 116
TDRs [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses | 246 |  |  |  | $ 286
Scenario, Previously Reported [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  | 2 years |  |  |
Residential Mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Foreclosed assets | 57 |  |  |  |
Residential mortgages in process of foreclosure | $ 608 |  |  |  |
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 7 months 6 days |  |  |  |

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