Investments - Amortized Cost and Fair Value of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 1,126,806	$ 997,196
Available-for-Sale, Gross Unrecognized Gains	829	3,974
Available-for-Sale, Gross Unrecognized Losses	(85,459)	(81,522)
Available-for-Sale, Fair Value	1,042,176	919,648
U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	81,808	39,103
Available-for-Sale, Gross Unrecognized Losses	(6,676)	(6,016)
Available-for-Sale, Fair Value	75,132	33,087
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	95,779	89,999
Available-for-Sale, Gross Unrecognized Gains	1	28
Available-for-Sale, Gross Unrecognized Losses	(741)	(771)
Available-for-Sale, Fair Value	95,039	89,256
Government-Sponsored Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	642,210	560,674
Available-for-Sale, Gross Unrecognized Gains	758	3,872
Available-for-Sale, Gross Unrecognized Losses	(39,121)	(35,403)
Available-for-Sale, Fair Value	603,847	529,143
Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	152,161	161,174
Available-for-Sale, Gross Unrecognized Losses	(23,096)	(23,333)
Available-for-Sale, Fair Value	129,065	137,841
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	61,274	56,722
Available-for-Sale, Gross Unrecognized Gains	45
Available-for-Sale, Gross Unrecognized Losses	(5,224)	(7,039)
Available-for-Sale, Fair Value	56,095	49,683
Small Business Administration Loan Pools [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	7,203	8,066
Available-for-Sale, Gross Unrecognized Losses	(330)	(339)
Available-for-Sale, Fair Value	6,873	7,727
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	86,371	81,458
Available-for-Sale, Gross Unrecognized Gains	25	74
Available-for-Sale, Gross Unrecognized Losses	(10,271)	(8,621)
Available-for-Sale, Fair Value	$ 76,125	$ 72,911

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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Amortized cost of 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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