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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Assets
Securities available for sale	$ 102,748	$ 89,255	[1]
Securities held to maturity	44,239	48,208	[1]
Restricted securities	1,590	1,570	[1]
Bank owned life insurance	13,894	13,967	[1]
Accrued interest receivable	2,138	1,916	[1]
Carrying Amount
Financial Assets
Cash and short-term investments	21,438	39,986
Securities available for sale	102,748	89,255
Securities held to maturity	44,239	48,208
Restricted securities	1,590	1,570
Loans held for sale	516	438
Loans, net	535,020	516,875
Bank owned life insurance	13,894	13,967
Accrued interest receivable	2,138	1,916
Financial Liabilities
Deposits	667,104	664,980
Subordinated debt	4,961	4,948
Junior subordinated debt	9,279	9,279
Accrued interest payable	123	98
Fair Value
Financial Assets
Cash and short-term investments	21,438	39,986
Securities available for sale	102,748	89,255
Securities held to maturity	42,707	47,702
Restricted securities	1,590	1,570
Loans held for sale	516	438
Loans, net	529,759	514,013
Bank owned life insurance	13,894	13,967
Accrued interest receivable	2,138	1,916
Financial Liabilities
Deposits	664,286	663,163
Subordinated debt	4,802	5,004
Junior subordinated debt	9,603	9,653
Accrued interest payable	123	98
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets
Cash and short-term investments	21,438	39,986
Securities available for sale	0	0
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	102,748	89,255
Securities held to maturity	41,218	46,186
Restricted securities	1,590	1,570
Loans held for sale	516	438
Loans, net	0	0
Bank owned life insurance	13,894	13,967
Accrued interest receivable	2,138	1,916
Financial Liabilities
Deposits	547,281	542,329
Subordinated debt	0	0
Junior subordinated debt	0	0
Accrued interest payable	123	98
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets
Cash and short-term investments	0	0
Securities available for sale	0	0
Securities held to maturity	1,489	1,516
Restricted securities	0	0
Loans held for sale	0	0
Loans, net	529,759	514,013
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities
Deposits	117,005	120,834
Subordinated debt	4,802	5,004
Junior subordinated debt	9,603	9,653
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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