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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, 2023	Dec. 31, 2022
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Securities available for sale, at fair value	$ 313,930	$ 354,341	[1]
Investment securities, Amortized Cost	383,731	413,015
Investment securities, Gross Unrealized Gains		175
Investment securities, Gross Unrealized Losses	(69,801)	(58,849)
Investment securities, Fair Value	313,930	354,341
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	51,122	60,018
Available for sale, Gross Unrealized Losses	(9,845)	(9,025)
Securities available for sale, at fair value	41,277	50,993
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	72,063	80,073
Available for sale, Gross Unrealized Losses	(12,651)	(12,911)
Securities available for sale, at fair value	59,412	67,162
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	223,638	230,015
Available for sale, Gross Unrealized Gains		51
Available for sale, Gross Unrealized Losses	(42,905)	(33,730)
Securities available for sale, at fair value	180,733	196,336
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	36,908	42,909
Available for sale, Gross Unrealized Gains		124
Available for sale, Gross Unrealized Losses	(4,400)	(3,183)
Securities available for sale, at fair value	$ 32,508	$ 39,850
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.

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