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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 3,024,001
Gross Unrealized Gains	75,149
Gross Unrealized Losses	(14,813)
Estimated Fair Value	3,084,337	$ 3,062,143
Amortized Cost, Held to Maturity	916,423	278,281
Gross Unrealized Gains, Held to Maturity	13,803
Gross Unrealized Losses, Held to Maturity	(20,070)
HTM securities	910,156
US Government Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	153,493
Gross Unrealized Gains	0
Gross Unrealized Losses	(283)
Estimated Fair Value	153,210
US Government Agencies Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	62,137
Gross Unrealized Gains	0
Gross Unrealized Losses	(71)
Estimated Fair Value	62,066
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,111,024	891,327
Gross Unrealized Gains	43,139	61,286
Gross Unrealized Losses	(3,769)	0
Estimated Fair Value	1,150,394	952,613
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	354,727	348,391
Gross Unrealized Gains	14,663	19,445
Gross Unrealized Losses	(52)	(691)
Estimated Fair Value	369,338	367,145
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	246,726	491,321
Gross Unrealized Gains	5,639	12,560
Gross Unrealized Losses	(330)	(115)
Estimated Fair Value	252,035	503,766
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	191,623	373,779
Gross Unrealized Gains	1,669	4,246
Gross Unrealized Losses	(3,169)	(27)
Estimated Fair Value	190,123	377,998
Amortized Cost, Held to Maturity	410,189	278,281
Gross Unrealized Gains, Held to Maturity	13,803	18,576
Gross Unrealized Losses, Held to Maturity	(6,514)	0
HTM securities	417,478	296,857
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	827,921	741,172
Gross Unrealized Gains	10,039	22,384
Gross Unrealized Losses	(5,922)	(1,141)
Estimated Fair Value	832,038	762,415
Amortized Cost, Held to Maturity	506,234
Gross Unrealized Gains, Held to Maturity	0
Gross Unrealized Losses, Held to Maturity	(13,556)
HTM securities	492,678
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	76,350	101,510
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,217)	(3,304)
Estimated Fair Value	$ 75,133	98,206
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,947,500
Gross Unrealized Gains		119,921
Gross Unrealized Losses		(5,278)
Estimated Fair Value		$ 3,062,143

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