Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	$ 99,102	$ 94,997
Gross Unrealized Gains	13	10
Gross Unrealized Losses	(11,943)	(11,605)
Fair value	87,172	83,402
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	42,035	41,515
Gross Unrealized Gains	6	2
Gross Unrealized Losses	(6,502)	(6,602)
Fair value	35,539	34,915
U.S. government agency securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	6,260	6,260
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,079)	(1,175)
Fair value	5,181	5,085
Obligations of state and political subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	44,311	45,161
Gross Unrealized Gains	6	8
Gross Unrealized Losses	(3,779)	(3,828)
Fair value	40,538	41,341
Small Business Association (SBA) securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	3,362
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair value	3,363
Subordinated debentures [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	450
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair value	450
SBIC securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	2,684	2,061
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(583)	0
Fair value	$ 2,101	$ 2,061