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Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	$ 104,309	$ 94,997
Gross Unrealized Gains	3	10
Gross Unrealized Losses	(16,248)	(11,605)
Fair value	88,064	83,402
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	47,917	41,515
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(7,875)	(6,602)
Fair value	40,043	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	(1,356)	(1,175)
Fair value	4,904	5,085
Obligations of state and political subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	44,063	45,161
Gross Unrealized Gains	0	8
Gross Unrealized Losses	(6,436)	(3,828)
Fair value	37,627	41,341
Small business association (SBA) securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	2,817
Gross Unrealized Gains	2
Gross Unrealized Losses	(1)
Fair value	2,818
Subordinated debentures [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	453
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair value	453
SBIC securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	2,799	2,061
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(580)	0
Fair value	$ 2,219	$ 2,061

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Amortized cost of 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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