Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Interest income:
Interest and fees on loans	$ 202.3	$ 238.9	$ 408.7	$ 481.0
Interest and dividends on investment securities:
Taxable	58.8	49.6	114.0	100.9
Exempt from federal taxes	0.7	0.7	1.4	1.4
Other Interest and Dividend Income	1.3	2.1	2.5	5.0
Interest on deposits in banks	7.5	6.2	15.3	12.5
Total interest income	270.6	297.5	541.9	600.8
Interest expense:
Interest on deposits	62.5	75.3	127.1	150.4
Interest on securities sold under repurchase agreements	0.9	1.1	1.9	2.3
Interest Expense, Other Short-term Borrowings	0.0	8.3	0.0	25.8
Interest on long-term debt	2.6	2.7	5.2	4.4
Interest on subordinated debentures held by subsidiary trusts	2.4	2.9	4.8	5.7
Interest Expense, Operating	68.4	90.3	139.0	188.6
Net interest income	202.2	207.2	402.9	412.2
Provision for Loan, Lease, and Other Losses	(3.2)	(0.3)	3.5	19.7
Net interest income after provision for credit losses	205.4	207.5	399.4	392.5
Noninterest income:
Payment Services Revenues	16.8	17.8	32.4	34.9
Mortgage banking revenues	1.5	1.8	2.8	3.2
Wealth management revenues	10.6	9.7	21.1	19.5
Service Charges on Deposit Accounts	6.6	6.9	13.1	13.5
Non-interest income	1.9	2.1	4.0	4.4
Other income	4.8	2.8	9.9	7.6
Gain on sale of branches, net	19.5	0.0	19.5	0.0
Total noninterest income	61.7	41.1	102.8	83.1
Noninterest expense:
Salaries and wages	64.9	65.0	133.4	133.6
Employee benefits	19.0	17.9	40.2	37.9
Outsourced technology services	16.7	13.3	32.6	27.5
Occupancy, net	13.6	13.4	27.0	27.1
Furniture and equipment	4.4	5.2	9.6	10.2
OREO expense, net	0.6	0.0	(0.5)	0.5
Professional fees	6.1	5.7	11.0	11.2
FDIC insurance premiums	3.4	4.0	6.2	8.3
Other intangibles amortization	3.3	3.4	6.6	6.8
Other expenses	26.9	27.2	50.4	52.6
Noninterest Expense	158.9	155.1	316.5	315.7
Income before income tax	108.2	93.5	185.7	159.9
Provision for income tax	24.3	21.8	41.6	38.0
Net income	$ 83.9	$ 71.7	$ 144.1	$ 121.9
Earnings per common share, basic (in dollars per share)	$ 0.87	$ 0.69	$ 1.47	$ 1.18
Earnings per common share, diluted (in dollars per share)	$ 0.87	$ 0.69	$ 1.47	$ 1.18
Weighted average common shares outstanding, basic (in shares)	96,583,247	103,260,996	97,725,651	103,177,077
Weighted average common shares outstanding, diluted (in shares)	96,785,949	103,363,692	98,012,697	103,404,063