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	Mar. 31, 2022	Dec. 31, 2021
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 96,130	$ 101,453
Gross Unrealized Gains	409	2,787
Gross Unrealized Losses	(3,337)	(457)
Fair Value	93,202	103,783
Held-to-Maturity, Amortized Cost	5,000
Fair value	4,981	0
Small Business Administration Loan Pools [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	1,020	1,099
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17)	(15)
Fair Value	1,003	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	44,827	46,115
Gross Unrealized Gains	397	2,405
Gross Unrealized Losses	(1,332)	(38)
Fair Value	43,892	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	50,283	54,239
Gross Unrealized Gains	12	382
Gross Unrealized Losses	(1,988)	(404)
Fair Value	48,307	$ 54,217
Corporate Debentures [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	5,000
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(19)
Fair value	$ 4,981

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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