Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income:
Interest and fees on loans	$ 249.9	$ 218.3	$ 727.1	$ 561.7
Interest and dividends on investment securities:
Taxable	66.0	64.3	203.3	142.4
Exempt from federal taxes	0.8	1.4	3.5	4.1
Other Interest and Dividend Income	2.9	1.3	9.3	2.8
Interest on deposits in banks	3.0	1.4	12.6	6.5
Total interest income	322.6	286.7	955.8	717.5
Interest expense:
Interest on deposits	68.8	13.3	162.7	20.6
Interest on securities sold under repurchase agreements	1.7	0.8	4.3	1.4
Interest Expense, Other Short-term Borrowings	33.6	2.4	104.1	2.4
Interest on long-term debt	1.5	1.5	4.4	4.6
Interest on subordinated debentures held by subsidiary trusts	3.3	1.9	9.3	4.3
Total interest expense	108.9	19.9	284.8	33.3
Net interest income	213.7	266.8	671.0	684.2
(Reduction of) provision for credit losses	(0.1)	8.4	26.8	68.0
Net interest income after provision for credit losses	213.8	258.4	644.2	616.2
Non-interest income:
Payment Services Revenues	19.2	20.4	58.0	54.7
Mortgage banking revenues	2.0	2.7	6.9	16.1
Wealth management revenues	8.7	8.5	26.5	25.9
Service Charges on Deposit Accounts	6.0	5.7	17.0	19.7
Non-interest income	2.2	4.7	7.0	12.6
Debt Securities, Available-for-sale, Gain (Loss)	0.0	(24.2)	(23.5)	(24.4)
Other income	3.9	5.1	10.6	17.0
Total non-interest income	42.0	22.9	102.5	121.6
Non-interest expense:
Salaries and wages	65.4	71.9	199.1	206.7
Employee benefits	19.7	19.6	61.8	60.2
Outsourced technology services	14.5	15.9	44.5	40.0
Occupancy, net	11.7	11.3	35.9	32.5
Furniture and equipment	5.3	5.8	16.8	17.0
OREO expense, net of income	0.5	0.0	1.3	0.1
Professional fees	5.1	5.1	14.9	14.5
FDIC insurance premiums	5.0	4.1	15.4	10.2
Other intangibles amortization	3.9	4.1	11.8	11.8
Other expenses	30.0	31.4	89.3	82.7
Acquisition related expenses	0.0	4.0	0.0	115.0
Noninterest Expense	161.1	173.2	490.8	590.7
Income before income tax	94.7	108.1	255.9	147.1
Provision for income tax	22.0	22.4	59.9	30.7
Net income	$ 72.7	$ 85.7	$ 196.0	$ 116.4
Earnings per common share, basic (in dollars per share)	$ 0.70	$ 0.80	$ 1.89	$ 1.13
Earnings per common share, diluted (in dollars per share)	$ 0.70	$ 0.80	$ 1.89	$ 1.13
Weighted average common shares outstanding, basic (in shares)	103,822,311	106,525,974	103,793,851	102,879,422
Weighted average common shares outstanding, diluted (in shares)	103,826,427	106,589,699	103,824,276	102,935,360