Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for Sale
Amortized Cost	$ 2,698,259	$ 2,992,513
Gross Unrealized Gains	1,569	301
Gross Unrealized Losses	(301,476)	(346,047)
Estimated Fair Value	2,398,352	2,646,767
Held to Maturity
Amortized Cost	1,267,922	1,321,256
Gross Unrealized Gains	0
Gross Unrealized Losses	(195,715)
Estimated Fair Value	1,072,207
U.S. Government securities
Available for Sale
Amortized Cost	42,475	226,140
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(314)	(7,655)
Estimated Fair Value	42,161	218,485
U.S. Government-sponsored agency securities
Available for Sale
Amortized Cost	1,038	1,050
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(28)	(42)
Estimated Fair Value	1,010	1,008
State and municipal securities
Available for Sale
Amortized Cost	1,200,571	1,284,245
Gross Unrealized Gains	1,089	283
Gross Unrealized Losses	(129,647)	(178,816)
Estimated Fair Value	1,072,013	1,105,712
Held to Maturity
Amortized Cost		1,321,256
Gross Unrealized Gains		0
Gross Unrealized Losses		(196,207)
Estimated Fair Value		1,125,049
Corporate debt securities
Available for Sale
Amortized Cost	480,714	459,792
Gross Unrealized Gains	473	0
Gross Unrealized Losses	(40,636)	(37,483)
Estimated Fair Value	440,551	422,309
Collateralized mortgage obligations
Available for Sale
Amortized Cost	122,824	147,155
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11,390)	(13,122)
Estimated Fair Value	111,434	134,033
Residential mortgage-backed securities
Available for Sale
Amortized Cost	223,273	242,527
Gross Unrealized Gains	7	18
Gross Unrealized Losses	(26,485)	(29,847)
Estimated Fair Value	196,795	212,698
Held to Maturity
Amortized Cost	407,075	457,325
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(51,805)	(57,480)
Estimated Fair Value	355,270	399,845
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	627,364	631,604
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(92,976)	(79,082)
Estimated Fair Value	534,388	552,522
Held to Maturity
Amortized Cost	860,847	863,931
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(143,910)	(138,727)
Estimated Fair Value	$ 716,937	$ 725,204

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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