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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Assets
Securities available for sale, at fair value	$ 93,102	$ 94,802	[1]
Securities held to maturity	49,376	53,398	[1]
Restricted securities	1,570	1,548	[1]
Bank owned life insurance	14,232	13,928	[1]
Accrued interest receivable	1,886	1,746	[1]
Carrying Amount
Financial Assets
Cash and short-term investments	33,642	41,092
Securities available for sale, at fair value	93,102	94,802
Securities held to maturity	49,376	53,398
Restricted securities	1,570	1,548
Loans held for sale	660	337
Loans, net	509,406	480,746
Bank owned life insurance	14,232	13,928
Accrued interest receivable	1,886	1,746
Financial Liabilities
Deposits	656,262	645,570
Subordinated debt	4,943	4,930
Junior subordinated debt	9,279	9,279
Accrued interest payable	95	95
Fair Value
Financial Assets
Cash and short-term investments	33,642	41,092
Securities available for sale, at fair value	93,102	94,802
Securities held to maturity	49,416	52,709
Restricted securities	1,570	1,548
Loans held for sale	660	337
Loans, net	508,911	481,475
Bank owned life insurance	14,232	13,928
Accrued interest receivable	1,886	1,746
Financial Liabilities
Deposits	655,031	644,322
Subordinated debt	4,756	4,715
Junior subordinated debt	9,632	9,075
Accrued interest payable	95	95
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets
Cash and short-term investments	33,642	41,092
Securities available for sale, at fair value	15	11
Securities held to maturity	0	0
Restricted securities	0	0
Loans held for sale	0	0
Loans, net	0	0
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities
Deposits	0	0
Subordinated debt	0	0
Junior subordinated debt	0	0
Accrued interest payable	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Assets
Cash and short-term investments	0	0
Securities available for sale, at fair value	93,087	94,791
Securities held to maturity	47,928	51,223
Restricted securities	1,570	1,548
Loans held for sale	660	337
Loans, net	0	0
Bank owned life insurance	14,232	13,928
Accrued interest receivable	1,886	1,746
Financial Liabilities
Deposits	530,230	517,143
Subordinated debt	0	0
Junior subordinated debt	0	0
Accrued interest payable	95	95
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets
Cash and short-term investments	0	0
Securities available for sale, at fair value	0	0
Securities held to maturity	1,488	1,486
Restricted securities	0	0
Loans held for sale	0	0
Loans, net	508,911	481,475
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities
Deposits	124,801	127,179
Subordinated debt	4,756	4,715
Junior subordinated debt	9,632	9,075
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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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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