Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	$ 162,578	$ 164,705
Gross Unrealized Gains, Available-for-sale	32	72
Gross Unrealized Losses, Available-for-sale	(13,341)	(14,708)
Fair Value, Available-for-sale	149,269	150,069
Amortized Cost, Held to maturity	243,334	247,401
Gross Unrealized Gains, Held to maturity	56	1
Gross Unrealized Losses, Held to maturity	(30,339)	(35,448)
Fair Value, Held to maturity	213,051	211,954
Amortized Cost	407,857	415,721
Gross Unrealized Gains	156	132
Gross Unrealized Losses	(43,680)	(50,156)
Fair Value	364,333	365,697
U.S. Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	23,174	23,194
Gross Unrealized Losses, Available-for-sale	(746)	(969)
Fair Value, Available-for-sale	22,428	22,225
Amortized Cost, Held to maturity	12,766	12,753
Gross Unrealized Losses, Held to maturity	(930)	(1,136)
Fair Value, Held to maturity	11,836	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	(1,149)	(1,369)
Fair Value, Available-for-sale	12,850	12,630
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	75,653	77,677
Gross Unrealized Gains, Available-for-sale	31	72
Gross Unrealized Losses, Available-for-sale	(7,789)	(8,859)
Fair Value, Available-for-sale	67,895	68,890
Amortized Cost, Held to maturity	227,996	232,068
Gross Unrealized Gains, Held to maturity	50
Gross Unrealized Losses, Held to maturity	(29,228)	(34,051)
Fair Value, Held to maturity	198,818	198,017
Asset-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	606	633
Gross Unrealized Losses, Available-for-sale	(35)	(15)
Fair Value, Available-for-sale	571	618
State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	20,431	20,462
Gross Unrealized Gains, Available-for-sale	1
Gross Unrealized Losses, Available-for-sale	(660)	(985)
Fair Value, Available-for-sale	19,772	19,477
Amortized Cost, Held to maturity	2,572	2,580
Gross Unrealized Gains, Held to maturity	6	1
Gross Unrealized Losses, Held to maturity	(181)	(261)
Fair Value, Held to maturity	2,397	2,320
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	28,715	28,740
Gross Unrealized Losses, Available-for-sale	(2,962)	(2,511)
Fair Value, Available-for-sale	25,753	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	68	59
Fair Value, Equity securities	253	244
Restricted Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	1,760	3,430
Fair Value	$ 1,760	$ 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 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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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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