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, 2023	Dec. 31, 2022
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 89,294	$ 86,920
Gross Unrealized Gains	0	14
Gross Unrealized Losses	(10,515)	(8,121)
Fair Value	78,779	78,813
Held-to-Maturity, Amortized Cost	37,778	31,822
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(3,190)	(1,742)
Held-to-maturity, Fair value	34,588	30,080
Allowance for Credit Loss	512
U.S. government agency securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	2,000
Gross Unrealized Gains	0
Gross Unrealized Losses	(18)
Fair Value	1,982
Small Business Administration Loan Pools [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	693	858
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14)	(15)
Fair Value	679	843
Obligations of state and political subdivisions [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	45,614	44,189
Gross Unrealized Gains	0	14
Gross Unrealized Losses	(5,935)	(4,034)
Fair Value	39,679	40,169
Mortgage-backed securities in government-sponsored entities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	40,987	41,873
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,548)	(4,072)
Fair Value	36,439	37,801
Corporate Debentures [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	15,000	14,993
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(1,963)	(994)
Held-to-maturity, Fair value	13,037	13,999
Allowance for Credit Loss	512
Structured Mortgage-backed Securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	22,778	16,829
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(1,227)	(748)
Held-to-maturity, Fair value	21,551	$ 16,081
Allowance for Credit Loss	$ 0

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 of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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