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Securities - Summary of Amortized Costs and Fair Values of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities available for sale:
Amortized Cost	$ 121,988	$ 102,147
Gross Unrealized Gains	448	75
Gross Unrealized (Losses)	(1,234)	(2,365)
Fair Value	121,202	99,857
Securities held to maturity:
Amortized Cost	19,489	43,408
Gross Unrealized Gains	35	29
Gross Unrealized (Losses)	(334)	(1,043)
Fair Value	19,190	42,394	[1]
Total securities, Amortized cost	141,477	145,555
Total securities, Gross unrealized gains	483	104
Total securities, Gross unrealized (losses)	(1,568)	(3,408)
Total securities, Fair value	140,392	142,251
U.S. agency and mortgage-backed securities
Securities available for sale:
Amortized Cost	96,345	86,944
Gross Unrealized Gains	295	44
Gross Unrealized (Losses)	(1,074)	(2,066)
Fair Value	95,566	84,922
Securities held to maturity:
Amortized Cost	14,193	27,420
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(332)	(869)
Fair Value	13,861	26,551
Obligations of states and political subdivisions
Securities available for sale:
Amortized Cost	25,643	15,203
Gross Unrealized Gains	153	31
Gross Unrealized (Losses)	(160)	(299)
Fair Value	25,636	14,935
Securities held to maturity:
Amortized Cost	3,796	14,488
Gross Unrealized Gains	22	20
Gross Unrealized (Losses)	(2)	(174)
Fair Value	3,816	14,334
Corporate debt securities
Securities held to maturity:
Amortized Cost	1,500	1,500
Gross Unrealized Gains	13	9
Gross Unrealized (Losses)	0	0
Fair Value	$ 1,513	$ 1,509
[1] Derived from audited consolidated financial statements.

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