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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities Available for Sale
Amortized Cost	$ 2,004,864	$ 2,138,533
Gross Unrealized Gains	1,110	1,007
Gross Unrealized Losses	(190,598)	(234,655)
Estimated Fair Value	1,815,376	1,904,885
Debt Securities Held to Maturity
Totals	101,672	111,866
Gross Unrealized Gains	4	5
Gross Unrealized Losses	(4,703)	(7,522)
Estimated Fair Value	96,973	104,349
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,221,272	1,268,654
Gross Unrealized Gains	727	16
Gross Unrealized Losses	(135,917)	(174,485)
Estimated Fair Value	1,086,082	1,094,185
Debt Securities Held to Maturity
Totals	98,940	109,155
Gross Unrealized Gains	3	3
Gross Unrealized Losses	(4,646)	(7,443)
Estimated Fair Value	94,297	101,715
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	240,719	249,627
Gross Unrealized Gains	34	66
Gross Unrealized Losses	(28,182)	(28,949)
Estimated Fair Value	212,571	220,744
Debt Securities Held to Maturity
Totals	2,732	2,711
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(57)	(79)
Estimated Fair Value	2,676	2,634
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	5,690	6,182
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(191)	(345)
Estimated Fair Value	5,503	5,837
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	265,749	314,814
Gross Unrealized Gains	171	687
Gross Unrealized Losses	(2,241)	(1,238)
Estimated Fair Value	263,679	314,263
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	271,434	299,256
Gross Unrealized Gains	174	238
Gross Unrealized Losses	(24,067)	(29,638)
Estimated Fair Value	$ 247,541	$ 269,856

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