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Asset Purchases - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2014
Scenario, Forecast [Member]
Jun. 30, 2014
Knisely [Member]
Jun. 30, 2014
Hicksville [Member]
Jun. 30, 2014
Custar [Member]
Business Acquisition [Line Items]              
Recognition of core deposit intangible asset with acquired purchase         $ 1,100,000 $ 1,090,000 $ 1,170,000
Number of years amortized over an estimated remaining economic useful life of deposits         7 years 7 years 7 years
Amortization expense $ 240,000 $ 156,000 $ 319,000 $ 480,000