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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets
Fair Value	$ 121,202	$ 99,857
Securities held to maturity	19,190	42,394	[1]
Restricted securities	1,701	1,688	[1]
Bank owned life insurance	17,094	13,991	[1]
Accrued interest receivable	2,143	2,113	[1]
Carrying Amount
Financial Assets
Cash and short-term investments	42,695	28,618
Fair Value	121,202	99,857
Securities held to maturity	19,489	43,408
Restricted securities	1,701	1,688
Loans held for sale	200	419
Loans, net	545,529	537,847
Bank owned life insurance	17,094	13,991
Accrued interest receivable	2,143	2,113
Financial Liabilities
Deposits	684,224	670,566
Other borrowings	5,000
Subordinated debt	4,969	4,965
Junior subordinated debt	9,279	9,279
Accrued interest payable	157	139
Fair Value
Financial Assets
Cash and short-term investments	42,695	28,618
Fair Value	121,202	99,857
Securities held to maturity	19,190	42,394
Restricted securities	1,701	1,688
Loans held for sale	200	419
Loans, net	541,176	528,643
Bank owned life insurance	17,094	13,991
Accrued interest receivable	2,143	2,113
Financial Liabilities
Deposits	682,426	668,567
Other borrowings	5,000
Subordinated debt	5,127	5,035
Junior subordinated debt	9,464	7,952
Accrued interest payable	157	139
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets
Cash and short-term investments	42,695	28,618
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
Other borrowings	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
Fair Value	121,202	99,857
Securities held to maturity	17,677	40,885
Restricted securities	1,701	1,688
Loans held for sale	200	419
Loans, net	0	0
Bank owned life insurance	17,094	13,991
Accrued interest receivable	2,143	2,113
Financial Liabilities
Deposits	566,934	551,347
Other borrowings	0
Subordinated debt	0	0
Junior subordinated debt	0	0
Accrued interest payable	157	139
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets
Cash and short-term investments	0	0
Fair Value	0	0
Securities held to maturity	1,513	1,509
Restricted securities	0	0
Loans held for sale	0	0
Loans, net	541,176	528,643
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities
Deposits	115,492	117,220
Other borrowings	5,000
Subordinated debt	5,127	5,035
Junior subordinated debt	9,464	7,952
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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