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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial Assets
Securities available for sale, at fair value	$ 93,699	$ 89,255	[1]
Securities held to maturity	46,791	48,208	[1]
Restricted securities	1,590	1,570	[1]
Bank owned life insurance	13,711	13,967	[1]
Accrued interest receivable	1,869	1,916	[1]
Carrying Amount
Financial Assets
Cash and short-term investments	69,277	39,986
Securities available for sale, at fair value	93,699	89,255
Securities held to maturity	46,791	48,208
Restricted securities	1,590	1,570
Loans held for sale	68	438
Loans, net	515,664	516,875
Bank owned life insurance	13,711	13,967
Accrued interest receivable	1,869	1,916
Financial Liabilities
Deposits	692,825	664,980
Subordinated debt	4,952	4,948
Junior subordinated debt	9,279	9,279
Accrued interest payable	106	98
Fair Value
Financial Assets
Cash and short-term investments	69,277	39,986
Securities available for sale, at fair value	93,699	89,255
Securities held to maturity	45,630	47,702
Restricted securities	1,590	1,570
Loans held for sale	68	438
Loans, net	515,058	514,013
Bank owned life insurance	13,711	13,967
Accrued interest receivable	1,869	1,916
Financial Liabilities
Deposits	690,385	663,163
Subordinated debt	4,884	5,004
Junior subordinated debt	9,357	9,653
Accrued interest payable	106	98
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets
Cash and short-term investments	69,277	39,986
Securities available for sale, at fair value	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, at fair value	93,699	89,255
Securities held to maturity	44,133	46,186
Restricted securities	1,590	1,570
Loans held for sale	68	438
Loans, net	0	0
Bank owned life insurance	13,711	13,967
Accrued interest receivable	1,869	1,916
Financial Liabilities
Deposits	567,790	542,329
Subordinated debt	0	0
Junior subordinated debt	0	0
Accrued interest payable	106	98
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	1,497	1,516
Restricted securities	0	0
Loans held for sale	0	0
Loans, net	515,058	514,013
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities
Deposits	122,595	120,834
Subordinated debt	4,884	5,004
Junior subordinated debt	9,357	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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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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