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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	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Securities available for sale, at fair value	$ 314,784	$ 321,081	[1]
Investment securities, Amortized Cost	359,476	379,654
Investment securities, Gross Unrealized Gains	1	12
Investment securities, Gross Unrealized Losses	(44,693)	(58,585)
Investment securities, Fair Value	314,784	321,081
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	192,870	212,214
Available for sale, Gross Unrealized Losses	(27,434)	(35,244)
Securities available for sale, at fair value	165,436	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	79,428	79,856
Available for sale, Gross Unrealized Losses	(7,975)	(10,985)
Securities available for sale, at fair value	71,453	68,871
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	50,295	50,682
Available for sale, Gross Unrealized Gains	1
Available for sale, Gross Unrealized Losses	(5,767)	(7,357)
Securities available for sale, at fair value	44,529	43,325
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	36,883	36,902
Available for sale, Gross Unrealized Gains		12
Available for sale, Gross Unrealized Losses	(3,517)	(4,999)
Securities available for sale, at fair value	$ 33,366	$ 31,915
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.

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