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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial Assets
Securities	$ 105,559	$ 83,292
Securities held to maturity	66,519
Restricted securities	1,391	1,366
Bank owned life insurance	11,742	11,357
Accrued interest receivable	1,661	1,261
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	39,334	24,845
Securities	105,559	83,292
Securities held to maturity	66,519
Restricted securities	1,391	1,366
Loans held for sale	323	328
Loans, net	433,475	371,692
Bank owned life insurance	11,742	11,357
Accrued interest receivable	1,661	1,261
Financial Liabilities
Deposits	627,116	444,338
Subordinated debt	4,913
Federal funds purchased		52
Other borrowings		26
Junior subordinated debt	9,279	9,279
Accrued interest payable	117	135
Fair Value [Member]
Financial Assets
Cash and short-term investments	39,334	24,845
Securities	105,559	83,292
Securities held to maturity	66,438
Restricted securities	1,391	1,366
Loans held for sale	323	328
Loans, net	438,392	378,930
Bank owned life insurance	11,742	11,357
Accrued interest receivable	1,661	1,261
Financial Liabilities
Deposits	626,321	444,210
Subordinated debt	4,913
Federal funds purchased		52
Other borrowings		26
Junior subordinated debt	8,141	9,756
Accrued interest payable	117	135
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	39,334	24,845
Securities	8	6
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities	105,551	83,286
Securities held to maturity	64,938
Restricted securities	1,391	1,366
Loans held for sale	323	328
Bank owned life insurance	11,742	11,357
Accrued interest receivable	1,661	1,261
Financial Liabilities
Deposits	486,015	342,604
Federal funds purchased		52
Accrued interest payable	117	135
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Securities held to maturity	1,500
Loans, net	438,392	378,930
Financial Liabilities
Deposits	140,306	101,606
Subordinated debt	4,913
Other borrowings		26
Junior subordinated debt	$ 8,141	$ 9,756

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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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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