Investments - Amortized Cost and Fair Value of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 1,079,252	$ 997,196
Available-for-Sale, Gross Unrealized Gains	1,336	3,974
Available-for-Sale, Gross Unrealized Losses	(76,133)	(81,522)
Available-for-Sale, Fair Value	1,004,455	919,648
U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	71,173	39,103
Available-for-Sale, Gross Unrealized Gains	68
Available-for-Sale, Gross Unrealized Losses	(6,147)	(6,016)
Available-for-Sale, Fair Value	65,094	33,087
U.S. Treasury securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	86,523	89,999
Available-for-Sale, Gross Unrealized Gains	118	28
Available-for-Sale, Gross Unrealized Losses	(78)	(771)
Available-for-Sale, Fair Value	86,563	89,256
Government-Sponsored Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	624,228	560,674
Available-for-Sale, Gross Unrealized Gains	946	3,872
Available-for-Sale, Gross Unrealized Losses	(36,002)	(35,403)
Available-for-Sale, Fair Value	589,172	529,143
Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	144,971	161,174
Available-for-Sale, Gross Unrealized Losses	(20,307)	(23,333)
Available-for-Sale, Fair Value	124,664	137,841
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	61,947	56,722
Available-for-Sale, Gross Unrealized Gains	177
Available-for-Sale, Gross Unrealized Losses	(3,472)	(7,039)
Available-for-Sale, Fair Value	58,652	49,683
Small Business Administration Loan Pools [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	6,542	8,066
Available-for-Sale, Gross Unrealized Losses	(276)	(339)
Available-for-Sale, Fair Value	6,266	7,727
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	83,868	81,458
Available-for-Sale, Gross Unrealized Gains	27	74
Available-for-Sale, Gross Unrealized Losses	(9,851)	(8,621)
Available-for-Sale, Fair Value	$ 74,044	$ 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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