Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Interest income:
Interest and fees on loans	$ 206.4	$ 242.1
Interest and dividends on investment securities:
Taxable	55.2	51.3
Exempt from federal taxes	0.7	0.7
Other Interest and Dividend Income	1.2	2.9
Interest on deposits in banks	7.8	6.3
Total interest income	271.3	303.3
Interest expense:
Interest on deposits	64.6	75.1
Interest on securities sold under repurchase agreements	1.0	1.2
Interest Expense, Other Short-term Borrowings	0.0	17.5
Interest on long-term debt	2.6	1.7
Interest on subordinated debentures held by subsidiary trusts	2.4	2.8
Interest Expense, Operating	70.6	98.3
Net interest income	200.7	205.0
Provision for Loan, Lease, and Other Losses	6.7	20.0
Net interest income after provision for credit losses	194.0	185.0
Noninterest income:
Payment Services Revenues	15.6	17.1
Mortgage banking revenues	1.3	1.4
Wealth management revenues	10.5	9.8
Service Charges on Deposit Accounts	6.5	6.6
Non-interest income	2.1	2.3
Other income	5.1	4.8
Total noninterest income	41.1	42.0
Noninterest expense:
Salaries and wages	68.5	68.6
Employee benefits	21.2	20.0
Outsourced technology services	15.9	14.2
Occupancy, net	13.4	13.7
Furniture and equipment	5.2	5.0
OREO expense, net	(1.1)	0.5
Professional fees	4.9	5.5
FDIC insurance premiums	2.8	4.3
Other intangibles amortization	3.3	3.4
Other expenses	23.5	25.4
Noninterest Expense	157.6	160.6
Income before income tax	77.5	66.4
Provision for income tax	17.3	16.2
Net income	$ 60.2	$ 50.2
Earnings per common share, basic (in dollars per share)	$ 0.61	$ 0.49
Earnings per common share, diluted (in dollars per share)	$ 0.61	$ 0.49
Weighted average common shares outstanding, basic (in shares)	98,880,749	103,092,225
Weighted average common shares outstanding, diluted (in shares)	99,241,041	103,415,987