Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	$ 101,773	$ 111,874
Gross Unrealized Gains, Available-for-sale	1,986	701
Gross Unrealized (Losses), Available-for-sale	(557)	(429)
Available-for-sale, at fair value	103,202	112,146
Amortized Cost, Held to maturity	10,871	13,869
Gross Unrealized Gains, Held to maturity	264	143
Gross Unrealized (Losses), Held to maturity	(15)	(62)
Fair Value, Held to maturity	11,120	13,950
Amortized Cost	117,311	130,410
Gross Unrealized Gains	2,280	883
Gross Unrealized (Losses)	(572)	(491)
Fair Value	119,019	130,802
U.S. Treasury Security [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	999	998
Gross Unrealized Gains, Available-for-sale	19	1
Available-for-sale, at fair value	1,018	999
U.S. Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale		5,500
Gross Unrealized (Losses), Available-for-sale		(4)
Available-for-sale, at fair value		5,496
Amortized Cost, Held to maturity		4,999
Gross Unrealized (Losses), Held to maturity		(6)
Fair Value, Held to maturity		4,993
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	74,063	75,676
Gross Unrealized Gains, Available-for-sale	1,362	326
Gross Unrealized (Losses), Available-for-sale	(211)	(145)
Available-for-sale, at fair value	75,214	75,857
Amortized Cost, Held to maturity	7,446	8,870
Gross Unrealized Gains, Held to maturity	264	143
Gross Unrealized (Losses), Held to maturity	(15)	(56)
Fair Value, Held to maturity	7,695	8,957
Asset-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	895	934
Gross Unrealized (Losses), Available-for-sale	(64)	(17)
Available-for-sale, at fair value	831	917
State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	18,828	21,161
Gross Unrealized Gains, Available-for-sale	549	351
Gross Unrealized (Losses), Available-for-sale		(1)
Available-for-sale, at fair value	19,377	21,511
Amortized Cost, Held to maturity	3,425
Fair Value, Held to maturity	3,425
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	6,988	7,605
Gross Unrealized Gains, Available-for-sale	56	23
Gross Unrealized (Losses), Available-for-sale	(282)	(262)
Available-for-sale, at fair value	6,762	7,366
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Equity securities	53	53
Gross Unrealized Gains, Equity securities	30	39
Fair Value, Equity securities	83	92
Restricted Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	4,614	4,614
Fair Value	$ 4,614	$ 4,614

Equity securities, FV-NI, cost with and without readily determinable value.

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Equity securities, FV-NI, unrealized gain with and without readily determinable value.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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