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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financial Assets
Securities available for sale	$ 112,468	$ 83,292
Securities held to maturity	37,343
Restricted securities	1,391	1,366
Bank owned life insurance	11,521	11,357
Accrued interest receivable	1,423	1,261
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	111,144	24,845
Securities available for sale	112,468	83,292
Securities held to maturity	37,343
Restricted securities	1,391	1,366
Loans held for sale	1,978	328
Loans, net	385,592	371,692
Bank owned life insurance	11,521	11,357
Accrued interest receivable	1,423	1,261
Financial Liabilities
Deposits	620,882	444,338
Federal funds purchased		52
Other borrowings	13	26
Trust preferred capital notes	9,279	9,279
Accrued interest payable	117	135
Fair Value [Member]
Financial Assets
Cash and short-term investments	111,144	24,845
Securities available for sale	112,468	83,292
Securities held to maturity	36,851
Restricted securities	1,391	1,366
Loans held for sale	1,978	328
Loans, net	392,974	378,930
Bank owned life insurance	11,521	11,357
Accrued interest receivable	1,423	1,261
Financial Liabilities
Deposits	619,475	444,210
Federal funds purchased		52
Other borrowings	13	26
Trust preferred capital notes	9,147	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	111,144	24,845
Securities available for sale	7	6
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	112,461	83,286
Securities held to maturity	36,851
Restricted securities	1,391	1,366
Loans held for sale	1,978	328
Bank owned life insurance	11,521	11,357
Accrued interest receivable	1,423	1,261
Financial Liabilities
Deposits	470,029	342,604
Federal funds purchased		52
Accrued interest payable	117	135
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Loans, net	392,974	378,930
Financial Liabilities
Deposits	149,446	101,606
Other borrowings	13	26
Trust preferred capital notes	$ 9,147	$ 9,756

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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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