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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Assets
Securities available for sale	$ 94,802	$ 105,559
Securities held to maturity	53,398	66,519
Restricted securities	1,548	1,391
Bank owned life insurance	13,928	11,742
Accrued interest receivable	1,746	1,661
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	41,092	39,334
Securities available for sale	94,802	105,559
Securities held to maturity	53,398	66,519
Restricted securities	1,548	1,391
Loans held for sale	337	323
Loans, net	480,746	433,475
Bank owned life insurance	13,928	11,742
Accrued interest receivable	1,746	1,661
Financial Liabilities
Deposits	645,570	627,116
Subordinated debt	4,930	4,913
Junior subordinated debt	9,279	9,279
Accrued interest payable	95	117
Fair Value [Member]
Financial Assets
Cash and short-term investments	41,092	39,334
Securities available for sale	94,802	105,559
Securities held to maturity	52,709	66,438
Restricted securities	1,548	1,391
Loans held for sale	337	323
Loans, net	481,475	438,392
Bank owned life insurance	13,928	11,742
Accrued interest receivable	1,746	1,661
Financial Liabilities
Deposits	644,322	626,321
Subordinated debt	4,715	4,913
Junior subordinated debt	9,075	8,141
Accrued interest payable	95	117
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	41,092	39,334
Securities available for sale	11	8
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	94,791	105,551
Securities held to maturity	51,223	64,938
Restricted securities	1,548	1,391
Loans held for sale	337	323
Bank owned life insurance	13,928	11,742
Accrued interest receivable	1,746	1,661
Financial Liabilities
Deposits	517,143	486,015
Accrued interest payable	95	117
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Securities held to maturity	1,486	1,500
Loans, net	481,475	438,392
Financial Liabilities
Deposits	127,179	140,306
Subordinated debt	4,715	4,913
Junior subordinated debt	$ 9,075	$ 8,141

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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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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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