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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 3,009,064
Gross Unrealized Gains	94,744
Gross Unrealized Losses	(6,433)
Estimated Fair Value	3,097,375	$ 3,062,143
Amortized Cost, Held to Maturity	824,283	278,281
Gross Unrealized Gains, Held to Maturity	15,470
Gross Unrealized Losses, Held to Maturity	(12,821)
HTM securities	826,932
US Government Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	153,885
Gross Unrealized Gains	0
Gross Unrealized Losses	(340)
Estimated Fair Value	153,545
US Government Agencies Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	62,529
Gross Unrealized Gains	0
Gross Unrealized Losses	(98)
Estimated Fair Value	62,431
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,002,146	891,327
Gross Unrealized Gains	53,924	61,286
Gross Unrealized Losses	(608)	0
Estimated Fair Value	1,055,462	952,613
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	354,593	348,391
Gross Unrealized Gains	16,876	19,445
Gross Unrealized Losses	(88)	(691)
Estimated Fair Value	371,381	367,145
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	299,333	491,321
Gross Unrealized Gains	7,965	12,560
Gross Unrealized Losses	(133)	(115)
Estimated Fair Value	307,165	503,766
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	201,654	373,779
Gross Unrealized Gains	1,641	4,246
Gross Unrealized Losses	(1,748)	(27)
Estimated Fair Value	201,547	377,998
Amortized Cost, Held to Maturity	439,220	278,281
Gross Unrealized Gains, Held to Maturity	15,470	18,576
Gross Unrealized Losses, Held to Maturity	(5,019)	0
HTM securities	449,671	296,857
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	858,574	741,172
Gross Unrealized Gains	14,338	22,384
Gross Unrealized Losses	(1,902)	(1,141)
Estimated Fair Value	871,010	762,415
Amortized Cost, Held to Maturity	385,063
Gross Unrealized Gains, Held to Maturity	0
Gross Unrealized Losses, Held to Maturity	(7,802)
HTM securities	377,261
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	76,350	101,510
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,516)	(3,304)
Estimated Fair Value	$ 74,834	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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