Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	$ 161,688	$ 164,705
Gross Unrealized Gains, Available-for-sale	2	72
Gross Unrealized Losses, Available-for-sale	(16,360)	(14,708)
Fair Value, Available-for-sale	145,330	150,069
Amortized Cost, Held to maturity	230,505	247,401
Gross Unrealized Gains, Held to maturity		1
Gross Unrealized Losses, Held to maturity	(42,810)	(35,448)
Fair Value, Held to maturity	187,695	211,954
Amortized Cost	393,939	415,721
Gross Unrealized Gains	63	132
Gross Unrealized Losses	(59,170)	(50,156)
Fair Value	334,832	365,697
U.S. Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	23,133	23,194
Gross Unrealized Losses, Available-for-sale	(675)	(969)
Fair Value, Available-for-sale	22,458	22,225
Amortized Cost, Held to maturity	10,292	12,753
Gross Unrealized Losses, Held to maturity	(1,083)	(1,136)
Fair Value, Held to maturity	9,209	11,617
U.S. Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	13,999	13,999
Gross Unrealized Losses, Available-for-sale	(1,151)	(1,369)
Fair Value, Available-for-sale	12,848	12,630
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	74,457	77,677
Gross Unrealized Gains, Available-for-sale	2	72
Gross Unrealized Losses, Available-for-sale	(10,008)	(8,859)
Fair Value, Available-for-sale	64,451	68,890
Amortized Cost, Held to maturity	217,656	232,068
Gross Unrealized Losses, Held to maturity	(41,334)	(34,051)
Fair Value, Held to maturity	176,322	198,017
Asset-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	569	633
Gross Unrealized Losses, Available-for-sale	(17)	(15)
Fair Value, Available-for-sale	552	618
State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	20,372	20,462
Gross Unrealized Losses, Available-for-sale	(1,573)	(985)
Fair Value, Available-for-sale	18,799	19,477
Amortized Cost, Held to maturity	2,557	2,580
Gross Unrealized Gains, Held to maturity		1
Gross Unrealized Losses, Held to maturity	(393)	(261)
Fair Value, Held to maturity	2,164	2,320
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	29,158	28,740
Gross Unrealized Losses, Available-for-sale	(2,936)	(2,511)
Fair Value, Available-for-sale	26,222	26,229
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Equity securities	185	185
Gross Unrealized Gains, Equity securities	61	59
Fair Value, Equity securities	246	244
Restricted Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	1,561	3,430
Fair Value	$ 1,561	$ 3,430

Equity securities, FV-NI, cost with and without readily determinable value.

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Equity securities, FV-NI, unrealized gain with and without readily determinable value.

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Marketable Securities Amortized Cost

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Marketable Securities Fair Value

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Marketable Securities Unrealized Gain

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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 investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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