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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, 2025	Dec. 31, 2024
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Securities available for sale, at fair value	$ 341,354	$ 312,035	[1]
Investment securities, Amortized Cost	382,452	367,569
Investment securities, Gross Unrealized Gains	474	0
Investment securities, Gross Unrealized Losses	(41,572)	(55,534)
Investment securities, Fair Value	341,354	312,035
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	219,457	199,453
Available for sale, Gross Unrealized Gains	406	0
Available for sale, Gross Unrealized Losses	(27,369)	(35,015)
Securities available for sale, at fair value	192,494	164,438
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	78,905	79,430
Available for sale, Gross Unrealized Gains	0	0
Available for sale, Gross Unrealized Losses	(6,866)	(9,975)
Securities available for sale, at fair value	72,039	69,455
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	49,352	50,233
Available for sale, Gross Unrealized Gains	1	0
Available for sale, Gross Unrealized Losses	(5,060)	(7,296)
Securities available for sale, at fair value	44,293	42,937
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	34,738	38,453
Available for sale, Gross Unrealized Gains	67	0
Available for sale, Gross Unrealized Losses	(2,277)	(3,248)
Securities available for sale, at fair value	$ 32,528	$ 35,205
[1] Derived from audited December 31, 2024 Consolidated Financial Statements.

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