Investment Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 101,453	$ 121,408
Gross Unrealized Gains	2,787	4,161
Gross Unrealized Losses	(457)	(122)
Fair Value	103,783	125,447
Small Business Administration Loan Pools [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	1,099	7,835
Gross Unrealized Gains	0	198
Gross Unrealized Losses	(15)	(39)
Fair Value	1,084	7,994
Obligations of state and political subdivisions [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	46,115	49,167
Gross Unrealized Gains	2,405	2,895
Gross Unrealized Losses	(38)	(3)
Fair Value	48,482	52,059
Mortgage-backed securities in government-sponsored entities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	54,239	64,406
Gross Unrealized Gains	382	1,068
Gross Unrealized Losses	(404)	(80)
Fair Value	$ 54,217	$ 65,394

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

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- Definition

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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