Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available for Sale
Amortized Cost	$ 3,719,516	$ 2,698,259
Gross Unrealized Gains	5,888	1,569
Gross Unrealized Losses	(314,505)	(301,476)
Estimated Fair Value	3,410,899	2,398,352
Held to Maturity
Amortized Cost	1,395,569	1,267,922
Gross Unrealized Gains	2
Gross Unrealized Losses	(212,122)
Estimated Fair Value	1,183,449
U.S. Government securities
Available for Sale
Amortized Cost		42,475
Gross Unrealized Gains		0
Gross Unrealized Losses		(314)
Estimated Fair Value		42,161
U.S. Government-sponsored agency securities
Available for Sale
Amortized Cost		1,038
Gross Unrealized Gains		0
Gross Unrealized Losses		(28)
Estimated Fair Value		1,010
State and municipal securities
Available for Sale
Amortized Cost	960,227	1,200,571
Gross Unrealized Gains	106	1,089
Gross Unrealized Losses	(145,446)	(129,647)
Estimated Fair Value	814,887	1,072,013
Held to Maturity
Amortized Cost		1,267,922
Gross Unrealized Gains		0
Gross Unrealized Losses		(195,715)
Estimated Fair Value		1,072,207
Corporate debt securities
Available for Sale
Amortized Cost	313,681	480,714
Gross Unrealized Gains	1,123	473
Gross Unrealized Losses	(14,434)	(40,636)
Estimated Fair Value	300,370	440,551
Collateralized mortgage obligations
Available for Sale
Amortized Cost	798,157	122,824
Gross Unrealized Gains	4,629	0
Gross Unrealized Losses	(13,901)	(11,390)
Estimated Fair Value	788,885	111,434
Residential mortgage-backed securities
Available for Sale
Amortized Cost	1,029,846	223,273
Gross Unrealized Gains	30	7
Gross Unrealized Losses	(40,001)	(26,485)
Estimated Fair Value	989,875	196,795
Held to Maturity
Amortized Cost	537,856	407,075
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(60,162)	(51,805)
Estimated Fair Value	477,696	355,270
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	617,605	627,364
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(100,723)	(92,976)
Estimated Fair Value	516,882	534,388
Held to Maturity
Amortized Cost	857,713	860,847
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(151,960)	(143,910)
Estimated Fair Value	$ 705,753	$ 716,937

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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