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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 2,693,919
Gross Unrealized Gains	79,411
Gross Unrealized Losses	(14,733)
Estimated Fair Value	2,758,597	$ 3,062,143
Amortized Cost, Held to Maturity	853,413	278,281
Gross Unrealized Gains, Held to Maturity	16,303
Gross Unrealized Losses, Held to Maturity	(25,973)
HTM securities	843,743
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	953,601
Gross Unrealized Gains	42,412
Gross Unrealized Losses	(1,253)
Estimated Fair Value	994,760
Amortized Cost, Held to Maturity	376,200
Amortized Cost		891,327
Gross Unrealized Gains		61,286
Gross Unrealized Losses		0
Estimated Fair Value		952,613
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	348,162
Gross Unrealized Gains	11,970
Gross Unrealized Losses	(761)
Estimated Fair Value	359,371
Amortized Cost		348,391
Gross Unrealized Gains		19,445
Gross Unrealized Losses		(691)
Estimated Fair Value		367,145
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	390,253
Gross Unrealized Gains	10,633
Gross Unrealized Losses	(1,005)
Estimated Fair Value	399,881
Amortized Cost		491,321
Gross Unrealized Gains		12,560
Gross Unrealized Losses		(115)
Estimated Fair Value		503,766
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	257,409
Gross Unrealized Gains	1,941
Gross Unrealized Losses	(3,986)
Estimated Fair Value	255,364
Amortized Cost, Held to Maturity	467,461	278,281
Gross Unrealized Gains, Held to Maturity	16,303	18,576
Gross Unrealized Losses, Held to Maturity	(8,025)	0
HTM securities	475,739	296,857
Amortized Cost		373,779
Gross Unrealized Gains		4,246
Gross Unrealized Losses		(27)
Estimated Fair Value		377,998
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	668,144
Gross Unrealized Gains	12,455
Gross Unrealized Losses	(7,582)
Estimated Fair Value	673,017
Amortized Cost, Held to Maturity	385,952
Gross Unrealized Gains, Held to Maturity	0
Gross Unrealized Losses, Held to Maturity	(17,948)
HTM securities	368,004
Amortized Cost		741,172
Gross Unrealized Gains		22,384
Gross Unrealized Losses		(1,141)
Estimated Fair Value		762,415
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	76,350
Gross Unrealized Gains	0
Gross Unrealized Losses	(146)
Estimated Fair Value	$ 76,204
Amortized Cost		101,510
Gross Unrealized Gains		0
Gross Unrealized Losses		(3,304)
Estimated Fair Value		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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