Investments - Amortized Cost and Fair Value of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 1,125,155	$ 1,022,470
Available-for-Sale, Gross Unrealized Gains	6,345	10,986
Available-for-Sale, Gross Unrealized Losses	(6,338)	(2,888)
Available-for-Sale, Fair Value	1,125,162	1,030,568
U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	25,676	25,960
Available-for-Sale, Gross Unrealized Gains	203	338
Available-for-Sale, Fair Value	25,879	26,298
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	38,665	35,134
Available-for-Sale, Gross Unrealized Gains	66	116
Available-for-Sale, Fair Value	38,731	35,250
Government-Sponsored Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	862,036	763,827
Available-for-Sale, Gross Unrealized Gains	5,282	9,598
Available-for-Sale, Gross Unrealized Losses	(4,250)	(1,280)
Available-for-Sale, Fair Value	863,068	772,145
Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	4,298	4,441
Available-for-Sale, Gross Unrealized Losses	(95)	(115)
Available-for-Sale, Fair Value	4,203	4,326
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	93,044	92,142
Available-for-Sale, Gross Unrealized Gains	641	734
Available-for-Sale, Gross Unrealized Losses	(1,325)	(1,078)
Available-for-Sale, Fair Value	92,360	91,798
Small Business Administration Loan Pools [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	77,400	80,199
Available-for-Sale, Gross Unrealized Gains	126	130
Available-for-Sale, Gross Unrealized Losses	(191)	(124)
Available-for-Sale, Fair Value	77,335	80,205
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	24,036	20,767
Available-for-Sale, Gross Unrealized Gains	27	70
Available-for-Sale, Gross Unrealized Losses	(477)	(291)
Available-for-Sale, Fair Value	$ 23,586	$ 20,546

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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