CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest Income
Interest and fees on loans	$ 1,257,389	$ 1,284,707	$ 1,198,908
Interest and dividends on investment securities:
Taxable	56,026	70,249	86,926
Tax-exempt	11,716	14,563	17,420
Dividends	7,357	11,644	12,023
Interest on federal funds sold and other short-term investments	1,738	2,556	5,723
Total interest income	1,334,226	1,383,719	1,321,000
Interest on deposits:
Savings, NOW and money market	42,879	76,169	145,177
Time	25,094	106,067	166,693
Interest on short-term borrowings	5,374	11,372	47,862
Interest on long-term borrowings and junior subordinated debentures	50,978	71,207	63,220
Total interest expense	124,325	264,815	422,952
Net Interest Income	1,209,901	1,118,904	898,048
(Credit) provision for credit losses for held to maturity securities	(263)	635	0
Provision for credit losses for loans	32,896	125,087	24,218
Net Interest Income After Provision for Credit Losses	1,177,268	993,182	873,830
Non-Interest Income
Insurance commissions	7,810	7,398	10,409
Gains (losses) on securities transactions, net	1,758	524	(150)
Other-than-temporary impairment losses on securities	0	0	(2,928)
Fees from loan servicing	11,651	10,352	9,794
Gains on sales of loans, net	26,669	42,251	18,914
Gains (losses) on sales of assets, net	901	(1,891)	78,333
Bank owned life insurance	8,817	10,083	8,232
Other	61,073	83,643	55,634
Non-interest income	155,013	183,032	214,520
Non-Interest Expense
Salary and employee benefits expense	375,865	333,221	327,431
Net occupancy and equipment expense	132,098	129,002	118,191
FDIC insurance assessment	14,183	18,949	21,710
Amortization of other intangible assets	21,827	24,645	18,080
Professional and legal fees	38,432	32,348	20,810
Loss on extinguishment of debt	8,406	12,036	31,995
Amortization of tax credit investments	10,910	13,335	20,392
Telecommunication expenses	11,409	10,737	9,883
Other	78,412	71,875	63,063
Total non-interest expense	691,542	646,148	631,555
Income Before Income Taxes	640,739	530,066	456,795
Income tax expense	166,899	139,460	147,002
Net Income	473,840	390,606	309,793
Dividends on preferred stock	12,688	12,688	12,688
Net Income Available to Common Shareholders	$ 461,152	$ 377,918	$ 297,105
Earnings Per Common Share:
Basic (in USD per share)	$ 1.13	$ 0.94	$ 0.88
Diluted (in USD per share)	1.12	0.93	0.87
Cash dividends declared per common share (in USD per share)	$ 0.44	$ 0.44	$ 0.44
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	407,445,379	403,754,356	337,792,270
Diluted (in shares)	410,018,328	405,046,207	340,117,808
Trust and Investment Services
Non-Interest Income
Services	$ 14,910	$ 12,415	$ 12,646
Deposit Account
Non-Interest Income
Services	$ 21,424	$ 18,257	$ 23,636