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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial Assets
Securities available for sale	$ 88,323	$ 105,559	[1]
Securities held to maturity	55,263	66,519	[1]
Restricted securities	1,548	1,391	[1]
Bank owned life insurance	13,808	11,742	[1]
Accrued interest receivable	1,631	1,661	[1]
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	56,857	39,334
Securities available for sale	88,323	105,559
Securities held to maturity	55,263	66,519
Restricted securities	1,548	1,391
Loans held for sale	1,053	323
Loans, net	465,224	433,475
Bank owned life insurance	13,808	11,742
Accrued interest receivable	1,631	1,661
Financial Liabilities
Deposits	640,742	627,116
Subordinated debt	4,926	4,913
Junior subordinated debt	9,279	9,279
Accrued interest payable	91	117
Fair Value [Member]
Financial Assets
Cash and short-term investments	56,857	39,334
Securities available for sale	88,323	105,559
Securities held to maturity	56,305	66,438
Restricted securities	1,548	1,391
Loans held for sale	1,053	323
Loans, net	471,778	438,392
Bank owned life insurance	13,808	11,742
Accrued interest receivable	1,631	1,661
Financial Liabilities
Deposits	640,699	626,321
Subordinated debt	4,986	4,913
Junior subordinated debt	8,109	8,141
Accrued interest payable	91	117
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	56,857	39,334
Securities available for sale	11	8
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	88,312	105,551
Securities held to maturity	54,781	64,938
Restricted securities	1,548	1,391
Loans held for sale	1,053	323
Bank owned life insurance	13,808	11,742
Accrued interest receivable	1,631	1,661
Financial Liabilities
Deposits	509,088	486,015
Accrued interest payable	91	117
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Securities held to maturity	1,524	1,500
Loans, net	471,778	438,392
Financial Liabilities
Deposits	131,611	140,306
Subordinated debt	4,986	4,913
Junior subordinated debt	$ 8,109	$ 8,141
[1] Derived from audited consolidated financial statements.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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