Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income:
Interest and fees on loans	$ 252.8	$ 241.6	$ 504.9	$ 477.2
Interest and dividends on investment securities:
Taxable	62.3	66.1	126.8	138.3
Exempt from federal taxes	0.7	0.8	1.4	1.7
Other Interest and Dividend Income	3.3	3.4	6.6	6.4
Interest on deposits in banks	4.9	5.4	9.0	9.6
Total interest income	324.0	317.3	648.7	633.2
Interest expense:
Interest on deposits	80.9	53.6	160.0	93.9
Interest on securities sold under repurchase agreements	1.9	1.5	4.2	2.6
Interest Expense, Other Short-term Borrowings	31.8	39.3	67.4	70.5
Interest on long-term debt	4.4	1.4	8.7	2.9
Interest on subordinated debentures held by subsidiary trusts	3.3	3.1	6.6	6.0
Total interest expense	122.3	98.9	246.9	175.9
Net interest income	201.7	218.4	401.8	457.3
Provision for credit losses	9.0	11.7	14.3	26.9
Net interest income after provision for credit losses	192.7	206.7	387.5	430.4
Non-interest income:
Payment Services Revenues	18.6	20.1	37.0	38.8
Mortgage banking revenues	1.7	2.6	3.4	4.9
Wealth management revenues	9.4	8.8	18.6	17.8
Service Charges on Deposit Accounts	6.4	5.8	12.4	11.0
Non-interest income	2.1	2.4	4.3	4.8
Debt Securities, Available-for-sale, Gain (Loss)	0.0	(0.1)	0.0	(23.5)
Other income	4.4	4.5	9.0	6.7
Total non-interest income	42.6	44.1	84.7	60.5
Non-interest expense:
Salaries and wages	66.3	68.1	131.5	133.7
Employee benefits	16.9	19.3	36.2	42.1
Outsourced technology services	14.0	15.3	27.6	30.0
Occupancy, net	11.7	11.7	24.0	24.2
Furniture and equipment	5.2	5.6	10.2	11.5
OREO expense, net of income	2.0	0.6	4.0	0.8
Professional fees	5.1	5.3	11.9	9.8
FDIC insurance premiums	6.6	4.7	14.0	10.4
Other intangibles amortization	3.7	3.9	7.4	7.9
Other expenses	25.4	29.4	50.3	59.3
Noninterest Expense	156.9	163.9	317.1	329.7
Income before income tax	78.4	86.9	155.1	161.2
Provision for income tax	18.4	19.9	36.7	37.9
Net income	$ 60.0	$ 67.0	$ 118.4	$ 123.3
Earnings per common share, basic (in dollars per share)	$ 0.58	$ 0.65	$ 1.15	$ 1.19
Earnings per common share, diluted (in dollars per share)	$ 0.58	$ 0.65	$ 1.15	$ 1.19
Weighted average common shares outstanding, basic (in shares)	102,936,996	103,820,649	102,890,697	103,779,386
Weighted average common shares outstanding, diluted (in shares)	103,093,135	103,822,891	103,075,443	103,821,925