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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Assets
Securities available for sale, at fair value	$ 99,857	$ 89,255
Securities held to maturity	43,408	48,208
Restricted securities	1,688	1,570
Bank owned life insurance	13,991	13,967
Accrued interest receivable	2,113	1,916
Carrying Amount
Financial Assets
Cash and short-term investments	28,618	39,986
Securities available for sale, at fair value	99,857	89,255
Securities held to maturity	43,408	48,208
Restricted securities	1,688	1,570
Loans held for sale	419	438
Loans, net	537,847	516,875
Bank owned life insurance	13,991	13,967
Accrued interest receivable	2,113	1,916
Financial Liabilities
Deposits	670,566	664,980
Subordinated debt	4,965	4,948
Junior subordinated debt	9,279	9,279
Accrued interest payable	139	98
Fair Value
Financial Assets
Cash and short-term investments	28,618	39,986
Securities available for sale, at fair value	99,857	89,255
Securities held to maturity	42,394	47,702
Restricted securities	1,688	1,570
Loans held for sale	419	438
Loans, net	528,643	514,013
Bank owned life insurance	13,991	13,967
Accrued interest receivable	2,113	1,916
Financial Liabilities
Deposits	668,567	663,163
Subordinated debt	5,035	5,004
Junior subordinated debt	7,952	9,653
Accrued interest payable	139	98
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets
Cash and short-term investments	28,618	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	99,857	89,255
Securities held to maturity	40,885	46,186
Restricted securities	1,688	1,570
Loans held for sale	419	438
Loans, net	0	0
Bank owned life insurance	13,991	13,967
Accrued interest receivable	2,113	1,916
Financial Liabilities
Deposits	551,347	542,329
Subordinated debt	0	0
Junior subordinated debt	0	0
Accrued interest payable	139	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	1,509	1,516
Restricted securities	0	0
Loans held for sale	0	0
Loans, net	528,643	514,013
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities
Deposits	117,220	120,834
Subordinated debt	5,035	5,004
Junior subordinated debt	7,952	9,653
Accrued interest payable	$ 0	$ 0

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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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