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Investment Securities and Other Investments - Summary of Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Securities available for sale, at fair value	$ 314,394	$ 321,081	[1]
Investment securities, Amortized Cost	375,897	379,654
Investment securities, Gross Unrealized Gains		12
Investment securities, Gross Unrealized Losses	(61,503)	(58,585)
Investment securities, Fair Value	314,394	321,081
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	208,856	212,214
Available for sale, Gross Unrealized Losses	(37,634)	(35,244)
Securities available for sale, at fair value	171,222	176,970
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	79,633	79,856
Available for sale, Gross Unrealized Losses	(11,499)	(10,985)
Securities available for sale, at fair value	68,134	68,871
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	50,513	50,682
Available for sale, Gross Unrealized Losses	(7,587)	(7,357)
Securities available for sale, at fair value	42,926	43,325
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	36,895	36,902
Available for sale, Gross Unrealized Gains		12
Available for sale, Gross Unrealized Losses	(4,783)	(4,999)
Securities available for sale, at fair value	$ 32,112	$ 31,915
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.

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