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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial Assets
Securities available for sale	$ 109,166	$ 83,292
Securities held to maturity	54,276
Restricted securities	1,391	1,366
Bank owned life insurance	11,627	11,357
Accrued interest receivable	1,543	1,261
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	76,846	24,845
Securities available for sale	109,166	83,292
Securities held to maturity	54,276
Restricted securities	1,391	1,366
Loans held for sale	471	328
Loans, net	400,838	371,692
Bank owned life insurance	11,627	11,357
Accrued interest receivable	1,543	1,261
Financial Liabilities
Deposits	613,907	444,338
Federal funds purchased		52
Other borrowings	7	26
Junior subordinated debt	9,279	9,279
Accrued interest payable	116	135
Fair Value [Member]
Financial Assets
Cash and short-term investments	76,846	24,845
Securities available for sale	109,166	83,292
Securities held to maturity	54,303
Restricted securities	1,391	1,366
Loans held for sale	471	328
Loans, net	408,853	378,930
Bank owned life insurance	11,627	11,357
Accrued interest receivable	1,543	1,261
Financial Liabilities
Deposits	613,865	444,210
Federal funds purchased		52
Other borrowings	7	26
Junior subordinated debt	8,623	9,756
Accrued interest payable	116	135
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	76,846	24,845
Securities available for sale	8	6
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	109,158	83,286
Securities held to maturity	54,303
Restricted securities	1,391	1,366
Loans held for sale	471	328
Bank owned life insurance	11,627	11,357
Accrued interest receivable	1,543	1,261
Financial Liabilities
Deposits	467,688	342,604
Federal funds purchased		52
Accrued interest payable	116	135
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Loans, net	408,853	378,930
Financial Liabilities
Deposits	146,177	101,606
Other borrowings	7	26
Junior subordinated debt	$ 8,623	$ 9,756

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