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Investments - Summary of Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost		$ 378,741
Available for sale, Gross Unrealized Gains		1,513
Available for sale, Gross Unrealized Losses		(6,722)
Securities available for sale, at fair value	$ 375,484	373,532	[1]
Investment securities, Amortized Cost	403,206
Investment securities, Gross Unrealized Gains	655
Investment securities, Gross Unrealized Losses	(28,377)
Investment securities, Fair Value	375,484
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	58,962	51,341
Available for sale, Gross Unrealized Gains	5	302
Available for sale, Gross Unrealized Losses	(4,041)	(530)
Securities available for sale, at fair value	54,926	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	75,402	65,680
Available for sale, Gross Unrealized Gains		0
Available for sale, Gross Unrealized Losses	(5,683)	(1,614)
Securities available for sale, at fair value	69,719	64,066
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	225,163	222,968
Available for sale, Gross Unrealized Gains	78	403
Available for sale, Gross Unrealized Losses	(18,106)	(4,261)
Securities available for sale, at fair value	207,135	219,110
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	43,679	38,752
Available for sale, Gross Unrealized Gains	572	808
Available for sale, Gross Unrealized Losses	(547)	(317)
Securities available for sale, at fair value	$ 43,704	$ 39,243
[1] Derived from audited December 31, 2021 Consolidated Financial Statements.

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