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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial Assets
Securities available for sale	$ 99,019	$ 105,559	[1]
Securities held to maturity	64,963	66,519	[1]
Restricted securities	1,548	1,391	[1]
Bank owned life insurance	13,828	11,742	[1]
Accrued interest receivable	1,741	1,661	[1]
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	39,327	39,334
Securities available for sale	99,019	105,559
Securities held to maturity	64,963	66,519
Restricted securities	1,548	1,391
Loans held for sale	523	323
Loans, net	448,556	433,475
Bank owned life insurance	13,828	11,742
Accrued interest receivable	1,741	1,661
Financial Liabilities
Deposits	633,118	627,116
Subordinated debt	4,917	4,913
Junior subordinated debt	9,279	9,279
Accrued interest payable	111	117
Fair Value [Member]
Financial Assets
Cash and short-term investments	39,327	39,334
Securities available for sale	99,019	105,559
Securities held to maturity	65,568	66,438
Restricted securities	1,548	1,391
Loans held for sale	523	323
Loans, net	456,263	438,392
Bank owned life insurance	13,828	11,742
Accrued interest receivable	1,741	1,661
Financial Liabilities
Deposits	633,036	626,321
Subordinated debt	5,001	4,913
Junior subordinated debt	8,578	8,141
Accrued interest payable	111	117
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	39,327	39,334
Securities available for sale	11	8
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	99,008	105,551
Securities held to maturity	64,030	64,938
Restricted securities	1,548	1,391
Loans held for sale	523	323
Bank owned life insurance	13,828	11,742
Accrued interest receivable	1,741	1,661
Financial Liabilities
Deposits	496,382	486,015
Accrued interest payable	111	117
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Securities held to maturity	1,538	1,500
Loans, net	456,263	438,392
Financial Liabilities
Deposits	136,654	140,306
Subordinated debt	5,001	4,913
Junior subordinated debt	$ 8,578	$ 8,141
[1] Derived from audited consolidated financial statements.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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