Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	$ 94,997	$ 100,028
Gross Unrealized Gains	10	1,803
Gross Unrealized Losses	(11,605)	(673)
Fair value	83,402	101,158
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	41,515	44,948
Gross Unrealized Gains	2	337
Gross Unrealized Losses	(6,602)	(635)
Fair value	34,915	44,650
U.S. government agency securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	6,260	6,267
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,175)	(29)
Fair value	5,085	6,238
Obligations of state and political subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	45,161	48,011
Gross Unrealized Gains	8	1,466
Gross Unrealized Losses	(3,828)	(9)
Fair value	41,341	49,468
SBIC securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	2,061	802
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair value	$ 2,061	$ 802

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of unrealized gain 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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Amount 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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