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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities Available for Sale
Amortized Cost	$ 2,054,626	$ 2,138,533
Gross Unrealized Gains	802	1,007
Gross Unrealized Losses	(203,078)	(234,655)
Estimated Fair Value	1,852,350	1,904,885
Debt Securities Held to Maturity
Totals	106,868	111,866
Gross Unrealized Gains	5	5
Gross Unrealized Losses	(5,857)	(7,522)
Estimated Fair Value	101,016	104,349
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,242,037	1,268,654
Gross Unrealized Gains	288	16
Gross Unrealized Losses	(147,835)	(174,485)
Estimated Fair Value	1,094,490	1,094,185
Debt Securities Held to Maturity
Totals	104,146	109,155
Gross Unrealized Gains	3	3
Gross Unrealized Losses	(5,775)	(7,443)
Estimated Fair Value	98,374	101,715
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	241,062	249,627
Gross Unrealized Gains	42	66
Gross Unrealized Losses	(27,905)	(28,949)
Estimated Fair Value	213,199	220,744
Debt Securities Held to Maturity
Totals	2,722	2,711
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(82)	(79)
Estimated Fair Value	2,642	2,634
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,184	6,182
Gross Unrealized Gains	26	0
Gross Unrealized Losses	(229)	(345)
Estimated Fair Value	5,981	5,837
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	285,784	314,814
Gross Unrealized Gains	239	687
Gross Unrealized Losses	(1,513)	(1,238)
Estimated Fair Value	284,510	314,263
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	279,559	299,256
Gross Unrealized Gains	207	238
Gross Unrealized Losses	(25,596)	(29,638)
Estimated Fair Value	$ 254,170	$ 269,856

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