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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Amortized Cost	$ 3,465,368
Gross Unrealized Gains	6,189
Gross Unrealized Losses	(147,224)
Estimated Fair Value	3,324,333	$ 3,187,390
Amortized Cost, Held to Maturity	964,341	980,384
Gross Unrealized Gains, Held to Maturity	1,686	11,022
Gross Unrealized Losses, Held to Maturity	(77,038)	(25,539)
HTM securities	888,989	965,867
US Government Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	376,986	127,831
Gross Unrealized Gains	88	0
Gross Unrealized Losses	(3,357)	(213)
Estimated Fair Value	373,717	127,618
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,192,156	1,139,187
Gross Unrealized Gains	3,870	50,161
Gross Unrealized Losses	(51,380)	(678)
Estimated Fair Value	1,144,646	1,188,670
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	401,142	373,482
Gross Unrealized Gains	1,517	13,009
Gross Unrealized Losses	(7,062)	(358)
Estimated Fair Value	395,597	386,133
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	175,270	206,532
Gross Unrealized Gains	153	3,581
Gross Unrealized Losses	(4,159)	(754)
Estimated Fair Value	171,264	209,359
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	295,590	231,607
Gross Unrealized Gains	326	1,224
Gross Unrealized Losses	(20,314)	(3,036)
Estimated Fair Value	275,602	229,795
Amortized Cost, Held to Maturity	384,675	404,958
Gross Unrealized Gains, Held to Maturity	1,686	11,022
Gross Unrealized Losses, Held to Maturity	(21,097)	(7,067)
HTM securities	365,264	408,913
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,024,224	974,541
Gross Unrealized Gains	235	6,141
Gross Unrealized Losses	(60,952)	(9,534)
Estimated Fair Value	963,507	971,148
Amortized Cost, Held to Maturity	579,666	575,426
Gross Unrealized Gains, Held to Maturity	0	0
Gross Unrealized Losses, Held to Maturity	(55,941)	(18,472)
HTM securities	$ 523,725	556,954
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		76,350
Gross Unrealized Gains		0
Gross Unrealized Losses		(1,683)
Estimated Fair Value		74,667
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		3,129,530
Gross Unrealized Gains		74,116
Gross Unrealized Losses		(16,256)
Estimated Fair Value		$ 3,187,390

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