Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Interest and fees on loans	$ 241.6	$ 191.7	$ 477.2	$ 343.4
Interest and dividends on investment securities:
Taxable	65.6	48.8	137.3	78.1
Exempt from federal taxes	1.3	1.4	2.7	2.7
Other Interest and Dividend Income	3.4	1.1	6.4	1.5
Interest on deposits in banks	5.4	3.4	9.6	5.1
Total interest income	317.3	246.4	633.2	430.8
Interest expense:
Interest on deposits	53.6	4.3	93.9	7.3
Interest on securities sold under repurchase agreements	1.5	0.3	2.6	0.6
Interest Expense, Other Short-term Borrowings	39.3	0.0	70.5	0.0
Interest on long-term debt	1.4	1.4	2.9	3.1
Interest on subordinated debentures held by subsidiary trusts	3.1	1.4	6.0	2.4
Total interest expense	98.9	7.4	175.9	13.4
Net interest income	218.4	239.0	457.3	417.4
Provision for (reduction of) credit losses	11.7	(1.7)	26.9	59.6
Net interest income after provision for credit losses	206.7	240.7	430.4	357.8
Non-interest income:
Payment Services Revenues	20.1	19.5	38.8	34.3
Mortgage banking revenues	2.6	5.0	4.9	13.4
Wealth management revenues	8.8	9.3	17.8	17.4
Service Charges on Deposit Accounts	5.8	6.3	11.0	14.0
Non-interest income	2.4	3.6	4.8	7.9
Debt Securities, Available-for-sale, Gain (Loss)	(0.1)	(0.1)	(23.5)	(0.2)
Other income	4.5	6.3	6.7	11.9
Total non-interest income	44.1	49.9	60.5	98.7
Non-interest expense:
Salaries and wages	68.1	74.8	133.7	134.8
Employee benefits	19.3	19.4	42.1	40.6
Outsourced technology services	15.3	12.8	30.0	24.1
Occupancy, net	11.7	11.2	24.2	21.2
Furniture and equipment	5.6	5.8	11.5	11.2
OREO expense, net of income	0.6	0.0	0.8	0.1
Professional fees	5.3	5.5	9.8	9.4
FDIC insurance premiums	4.7	2.8	10.4	6.1
Other intangibles amortization	3.9	4.1	7.9	7.7
Other expenses	29.4	28.1	59.3	51.3
Acquisition related expenses	0.0	45.8	0.0	111.0
Noninterest Expense	163.9	210.3	329.7	417.5
Income before income tax	86.9	80.3	161.2	39.0
Provision for income tax	19.9	16.2	37.9	8.3
Net income	$ 67.0	$ 64.1	$ 123.3	$ 30.7
Earnings per common share, basic (in dollars per share)	$ 0.65	$ 0.59	$ 1.19	$ 0.30
Earnings per common share, diluted (in dollars per share)	$ 0.65	$ 0.59	$ 1.19	$ 0.30
Weighted average common shares outstanding, basic (in shares)	103,820,649	109,106,891	103,779,386	101,025,926
Weighted average common shares outstanding, diluted (in shares)	103,822,891	109,131,718	103,821,925	101,076,331