Investment Securities - Summary of Amortized Cost and Held-to-maturity, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 89,368	$ 101,453
Gross Unrealized Gains	1	2,787
Gross Unrealized Losses	(10,671)	(457)
Fair Value	78,698	103,783
Held-to-Maturity, Amortized Cost	32,571	0
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(1,656)
Fair value	30,915	0
Small Business Administration Loan Pools [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	914	1,099
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(13)	(15)
Fair Value	901	1,084
Obligations of state and political subdivisions [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	44,352	46,115
Gross Unrealized Gains	1	2,405
Gross Unrealized Losses	(6,006)	(38)
Fair Value	38,347	48,482
Mortgage-backed securities in government-sponsored entities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	44,102	54,239
Gross Unrealized Gains	0	382
Gross Unrealized Losses	(4,652)	(404)
Fair Value	39,450	$ 54,217
Corporate Debentures [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	14,993
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(883)
Fair value	14,110
Structured Mortgage-backed Securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	17,578
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(773)
Fair value	$ 16,805

Debt securities available for sale reconciliation of fair value to amortized cost.

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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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Amount, before tax, of unrealized loss 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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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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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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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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