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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Amortized Cost	$ 3,034,088
Gross Unrealized Gains	892
Gross Unrealized Losses	(256,142)
Estimated Fair Value	2,778,838	$ 3,187,390
Amortized Cost, Held to Maturity	1,338,963	980,384
Gross Unrealized Gains, Held to Maturity	309	11,022
Gross Unrealized Losses, Held to Maturity	(123,947)	(25,539)
HTM securities	1,215,325	965,867
US Government Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	376,505	127,831
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5,239)	(213)
Estimated Fair Value	371,266	127,618
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,239,591	1,139,187
Gross Unrealized Gains	501	50,161
Gross Unrealized Losses	(156,615)	(678)
Estimated Fair Value	1,083,477	1,188,670
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	413,487	373,482
Gross Unrealized Gains	186	13,009
Gross Unrealized Losses	(20,112)	(358)
Estimated Fair Value	393,561	386,133
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	154,558	206,532
Gross Unrealized Gains	10	3,581
Gross Unrealized Losses	(6,465)	(754)
Estimated Fair Value	148,103	209,359
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	213,567	231,607
Gross Unrealized Gains	167	1,224
Gross Unrealized Losses	(18,375)	(3,036)
Estimated Fair Value	195,359	229,795
Amortized Cost, Held to Maturity	466,076	404,958
Gross Unrealized Gains, Held to Maturity	297	11,022
Gross Unrealized Losses, Held to Maturity	(35,444)	(7,067)
HTM securities	430,929	408,913
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	636,380	974,541
Gross Unrealized Gains	28	6,141
Gross Unrealized Losses	(49,336)	(9,534)
Estimated Fair Value	587,072	971,148
Amortized Cost, Held to Maturity	872,887	575,426
Gross Unrealized Gains, Held to Maturity	12	0
Gross Unrealized Losses, Held to Maturity	(88,503)	(18,472)
HTM securities	$ 784,396	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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