Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income:
Interest and fees on loans	$ 258.9	$ 249.9	$ 763.8	$ 727.1
Interest and dividends on investment securities:
Taxable	60.7	66.0	187.5	204.3
Exempt from federal taxes	0.7	0.8	2.1	2.5
Other Interest and Dividend Income	2.8	2.9	9.4	9.3
Interest on deposits in banks	4.9	3.0	13.9	12.6
Total interest income	328.0	322.6	976.7	955.8
Interest expense:
Interest on deposits	84.2	68.8	244.2	162.7
Interest on securities sold under repurchase agreements	1.4	1.7	5.6	4.3
Interest Expense, Other Short-term Borrowings	32.0	33.6	99.4	104.1
Interest on long-term debt	1.6	1.5	10.3	4.4
Interest on subordinated debentures held by subsidiary trusts	3.3	3.3	9.9	9.3
Total interest expense	122.5	108.9	369.4	284.8
Net interest income	205.5	213.7	607.3	671.0
Provision for credit losses	19.8	(0.1)	34.1	26.8
Net interest income after provision for credit losses	185.7	213.8	573.2	644.2
Non-interest income:
Payment Services Revenues	18.7	19.2	55.7	58.0
Mortgage banking revenues	1.7	2.0	5.1	6.9
Wealth management revenues	9.6	8.7	28.2	26.5
Service Charges on Deposit Accounts	6.6	6.0	19.0	17.0
Non-interest income	2.2	2.2	6.5	7.0
Debt Securities, Available-for-sale, Gain (Loss)	0.0	0.0	0.0	(23.5)
Other income	7.6	3.9	16.6	10.6
Total non-interest income	46.4	42.0	131.1	102.5
Non-interest expense:
Salaries and wages	70.9	65.4	202.4	199.1
Employee benefits	19.7	19.7	55.9	61.8
Outsourced technology services	14.6	14.5	42.2	44.5
Occupancy, net	11.8	11.7	35.8	35.9
Furniture and equipment	5.2	5.3	15.4	16.8
OREO expense, net of income	0.0	0.5	4.0	1.3
Professional fees	4.2	5.1	16.1	14.9
FDIC insurance premiums	5.2	5.0	19.2	15.4
Other intangibles amortization	3.6	3.9	11.0	11.8
Other expenses	24.2	30.0	74.5	89.3
Noninterest Expense	159.4	161.1	476.5	490.8
Income before income tax	72.7	94.7	227.8	255.9
Provision for income tax	17.2	22.0	53.9	59.9
Net income	$ 55.5	$ 72.7	$ 173.9	$ 196.0
Earnings per common share, basic (in dollars per share)	$ 0.54	$ 0.70	$ 1.69	$ 1.89
Earnings per common share, diluted (in dollars per share)	$ 0.54	$ 0.70	$ 1.69	$ 1.89
Weighted average common shares outstanding, basic (in shares)	102,970,851	103,822,311	102,917,610	103,793,851
Weighted average common shares outstanding, diluted (in shares)	103,233,618	103,826,427	103,125,059	103,824,276