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	Jun. 30, 2022	Dec. 31, 2021
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 91,942	$ 101,453
Gross Unrealized Gains	53	2,787
Gross Unrealized Losses	(6,239)	(457)
Fair Value	85,756	103,783
Held-to-Maturity, Amortized Cost	28,816
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(526)
Fair value	28,290	0
Small Business Administration Loan Pools [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	706	1,099
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(13)	(15)
Fair Value	693	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	44,389	46,115
Gross Unrealized Gains	50	2,405
Gross Unrealized Losses	(3,446)	(38)
Fair Value	40,993	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	46,847	54,239
Gross Unrealized Gains	3	382
Gross Unrealized Losses	(2,780)	(404)
Fair Value	44,070	$ 54,217
Corporate Debentures [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	9,993
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(241)
Fair value	9,752
Structured Mortgage-backed Securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	18,823
Gross Unrecognized Gain	0
Gross Unrecognized Losses	(285)
Fair value	$ 18,538

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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