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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Assets
Securities available for sale	$ 94,566	$ 105,559	[1]
Securities held to maturity	57,401	66,519	[1]
Restricted securities	2,058	1,391	[1]
Bank owned life insurance	13,935	11,742	[1]
Accrued interest receivable	1,612	1,661	[1]
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	50,743	39,334
Securities available for sale	94,566	105,559
Securities held to maturity	57,401	66,519
Restricted securities	2,058	1,391
Loans held for sale	1,819	323
Loans, net	459,812	433,475
Bank owned life insurance	13,935	11,742
Accrued interest receivable	1,612	1,661
Financial Liabilities
Deposits	630,346	627,116
Other borrowings	12,000
Subordinated debt	4,921	4,913
Junior subordinated debt	9,279	9,279
Accrued interest payable	98	117
Fair Value [Member]
Financial Assets
Cash and short-term investments	50,743	39,334
Securities available for sale	94,566	105,559
Securities held to maturity	58,375	66,438
Restricted securities	2,058	1,391
Loans held for sale	1,819	323
Loans, net	468,394	438,392
Bank owned life insurance	13,935	11,742
Accrued interest receivable	1,612	1,661
Financial Liabilities
Deposits	630,497	626,321
Other borrowings	11,998
Subordinated debt	5,013	4,913
Junior subordinated debt	8,111	8,141
Accrued interest payable	98	117
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	50,743	39,334
Securities available for sale	16	8
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	94,550	105,551
Securities held to maturity	56,840	64,938
Restricted securities	2,058	1,391
Loans held for sale	1,819	323
Bank owned life insurance	13,935	11,742
Accrued interest receivable	1,612	1,661
Financial Liabilities
Deposits	496,867	486,015
Accrued interest payable	98	117
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Securities held to maturity	1,535	1,500
Loans, net	468,394	438,392
Financial Liabilities
Deposits	133,630	140,306
Other borrowings	11,998
Subordinated debt	5,013	4,913
Junior subordinated debt	$ 8,111	$ 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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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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