Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest income:
Interest and fees on loans	$ 242.1	$ 252.1
Interest and dividends on investment securities:
Taxable	51.3	64.5
Exempt from federal taxes	0.7	0.7
Other Interest and Dividend Income	2.9	3.3
Interest on deposits in banks	6.3	4.1
Total interest income	303.3	324.7
Interest expense:
Interest on deposits	75.1	79.1
Interest on securities sold under repurchase agreements	1.2	2.3
Interest Expense, Other Short-term Borrowings	17.5	35.6
Interest on long-term debt	1.7	4.3
Interest on subordinated debentures held by subsidiary trusts	2.8	3.3
Interest Expense, Operating	98.3	124.6
Net interest income	205.0	200.1
Provision for Loan, Lease, and Other Losses	20.0	5.3
Net interest income after provision for credit losses	185.0	194.8
Noninterest income:
Payment Services Revenues	17.1	18.4
Mortgage banking revenues	1.4	1.7
Wealth management revenues	9.8	9.2
Service Charges on Deposit Accounts	6.6	6.0
Non-interest income	2.3	2.2
Other income	4.8	4.6
Total noninterest income	42.0	42.1
Noninterest expense:
Salaries and wages	68.6	65.2
Employee benefits	20.0	19.3
Outsourced technology services	14.2	13.6
Occupancy, net	13.7	12.3
Furniture and equipment	5.0	5.0
OREO expense, net	0.5	2.0
Professional fees	5.5	6.8
FDIC insurance premiums	4.3	7.4
Other intangibles amortization	3.4	3.7
Other expenses	25.4	24.9
Noninterest Expense	160.6	160.2
Income before income tax	66.4	76.7
Provision for income tax	16.2	18.3
Net income	$ 50.2	$ 58.4
Earnings per common share, basic (in dollars per share)	$ 0.49	$ 0.57
Earnings per common share, diluted (in dollars per share)	$ 0.49	$ 0.57
Weighted average common shares outstanding, basic (in shares)	103,092,225	102,844,397
Weighted average common shares outstanding, diluted (in shares)	103,415,987	103,040,034