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Investments - Summary of Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Securities available for sale, at fair value	$ 359,516	$ 373,532	[1]
Investment securities, Amortized Cost	422,558	378,741
Investment securities, Gross Unrealized Gains	231	1,513
Investment securities, Gross Unrealized Losses	(63,273)	(6,722)
Investment securities, Fair Value	359,516	373,532
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	60,630	51,341
Available for sale, Gross Unrealized Gains		302
Available for sale, Gross Unrealized Losses	(9,598)	(530)
Securities available for sale, at fair value	51,032	51,113
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	72,041	65,680
Available for sale, Gross Unrealized Losses	(11,956)	(1,614)
Securities available for sale, at fair value	60,085	64,066
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	246,973	222,968
Available for sale, Gross Unrealized Gains	62	403
Available for sale, Gross Unrealized Losses	(39,215)	(4,261)
Securities available for sale, at fair value	207,820	219,110
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	42,914	38,752
Available for sale, Gross Unrealized Gains	169	808
Available for sale, Gross Unrealized Losses	(2,504)	(317)
Securities available for sale, at fair value	$ 40,579	$ 39,243
[1] Derived from audited December 31, 2021 Consolidated Financial Statements.

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