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Business Combination & Asset Purchase - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 09, 2010
Business Acquisition [Line Items] |  |  |  |
Deposits at close included in purchase | $ 29,500 |  | $ 29,500 |
Loans included in purchase |  |  | 11,400 |
Aggregate acquisition cost |  |  | (15,215) |
Recognition of core deposit intangible asset with acquired purchase | $ 2,260 |  |  |
Number of years amortized over an estimated remaining economic useful life of deposits | 7 years |  |  |
Amortization expense | $ 323 | $ 480 | 319 |
Custar [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate acquisition cost |  |  | 1,200 |
Recognition of core deposit intangible asset with acquired purchase |  |  | $ 1,170 |
Hicksville [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Recognition of core deposit intangible asset with acquired purchase |  |  |  | $ 1,090
Knisely [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Recognition of core deposit intangible asset with acquired purchase |  | $ 1,100 |  |

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