Investments - Amortized Cost and Fair Value of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 1,022,470	$ 1,079,252
Available-for-Sale, Gross Unrealized Gains	10,986	1,336
Available-for-Sale, Gross Unrealized Losses	(2,888)	(76,133)
Available-for-Sale, Fair Value	1,030,568	1,004,455
U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	25,960	71,173
Available-for-Sale, Gross Unrealized Gains	338	68
Available-for-Sale, Gross Unrealized Losses		(6,147)
Available-for-Sale, Fair Value	26,298	65,094
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	35,134	86,523
Available-for-Sale, Gross Unrealized Gains	116	118
Available-for-Sale, Gross Unrealized Losses		(78)
Available-for-Sale, Fair Value	35,250	86,563
Government-Sponsored Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	763,827	600,558
Available-for-Sale, Gross Unrealized Gains	9,598	887
Available-for-Sale, Gross Unrealized Losses	(1,280)	(35,935)
Available-for-Sale, Fair Value	772,145	565,510
Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	4,441	144,971
Available-for-Sale, Gross Unrealized Losses	(115)	(20,307)
Available-for-Sale, Fair Value	4,326	124,664
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	92,142	61,947
Available-for-Sale, Gross Unrealized Gains	734	177
Available-for-Sale, Gross Unrealized Losses	(1,078)	(3,472)
Available-for-Sale, Fair Value	91,798	58,652
Small Business Administration Loan Pools [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	80,199	30,212
Available-for-Sale, Gross Unrealized Gains	130	59
Available-for-Sale, Gross Unrealized Losses	(124)	(343)
Available-for-Sale, Fair Value	80,205	29,928
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	20,767	83,868
Available-for-Sale, Gross Unrealized Gains	70	27
Available-for-Sale, Gross Unrealized Losses	(291)	(9,851)
Available-for-Sale, Fair Value	$ 20,546	$ 74,044

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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