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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for Sale
Amortized Cost	$ 2,992,513	$ 3,129,530
Gross Unrealized Gains	301	74,116
Gross Unrealized Losses	(346,047)	(16,256)
Estimated Fair Value	2,646,767	3,187,390
Held to Maturity
Amortized Cost	1,321,256	980,384
Gross Unrealized Gains	0
Gross Unrealized Losses	(196,207)
Estimated Fair Value	1,125,049
U.S. Government securities
Available for Sale
Amortized Cost	226,140	127,831
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,655)	(213)
Estimated Fair Value	218,485	127,618
State and municipal securities
Available for Sale
Amortized Cost	1,284,245	1,139,187
Gross Unrealized Gains	283	50,161
Gross Unrealized Losses	(178,816)	(678)
Estimated Fair Value	1,105,712	1,188,670
Held to Maturity
Amortized Cost		980,384
Gross Unrealized Gains		11,022
Gross Unrealized Losses		(25,539)
Estimated Fair Value		965,867
Corporate debt securities
Available for Sale
Amortized Cost	459,792	373,482
Gross Unrealized Gains	0	13,009
Gross Unrealized Losses	(37,483)	(358)
Estimated Fair Value	422,309	386,133
Collateralized mortgage obligations
Available for Sale
Amortized Cost	147,155	206,532
Gross Unrealized Gains	0	3,581
Gross Unrealized Losses	(13,122)	(754)
Estimated Fair Value	134,033	209,359
Residential mortgage-backed securities
Available for Sale
Amortized Cost	242,527	231,607
Gross Unrealized Gains	18	1,224
Gross Unrealized Losses	(29,847)	(3,036)
Estimated Fair Value	212,698	229,795
Held to Maturity
Amortized Cost	457,325	404,958
Gross Unrealized Gains	0	11,022
Gross Unrealized Losses	(57,480)	(7,067)
Estimated Fair Value	399,845	408,913
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	631,604	974,541
Gross Unrealized Gains	0	6,141
Gross Unrealized Losses	(79,082)	(9,534)
Estimated Fair Value	552,522	971,148
Held to Maturity
Amortized Cost	863,931	575,426
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(138,727)	(18,472)
Estimated Fair Value	$ 725,204	556,954
Auction rate securities
Available for Sale
Amortized Cost		76,350
Gross Unrealized Gains		0
Gross Unrealized Losses		(1,683)
Estimated Fair Value		$ 74,667

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