Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income:
Interest and fees on loans	$ 235.6	$ 151.7
Interest and dividends on investment securities:
Taxable	71.7	29.3
Exempt from federal taxes	1.4	1.3
Other Interest and Dividend Income	3.0	0.4
Interest on deposits in banks	4.2	1.7
Total interest income	315.9	184.4
Interest expense:
Interest on deposits	40.3	3.0
Interest on securities sold under repurchase agreements	1.1	0.3
Interest Expense, Other Short-term Borrowings	31.2	0.0
Interest on long-term debt	1.5	1.7
Interest on subordinated debentures held by subsidiary trusts	2.9	1.0
Total interest expense	77.0	6.0
Net interest income	238.9	178.4
Provision for credit losses	15.2	61.3
Net interest income after provision for credit losses	223.7	117.1
Non-interest income:
Payment Services Revenues	18.7	14.8
Mortgage banking revenues	2.3	8.4
Wealth management revenues	9.0	8.1
Service Charges on Deposit Accounts	5.2	7.7
Non-interest income	2.4	4.3
Debt Securities, Available-for-sale, Gain (Loss)	(23.4)	(0.1)
Other income	2.2	5.6
Total non-interest income	16.4	48.8
Non-interest expense:
Salaries and wages	65.6	60.0
Employee benefits	22.8	21.2
Outsourced technology services	14.7	11.3
Occupancy, net	12.5	10.0
Furniture and equipment	5.9	5.4
OREO expense, net of income	0.2	0.1
Professional fees	4.5	3.9
FDIC insurance premiums	5.7	3.3
Other intangibles amortization	4.0	3.6
Other expenses	29.9	23.2
Acquisition related expenses	0.0	65.2
Noninterest Expense	165.8	207.2
Income (loss) before income tax	74.3	(41.3)
Provision for (benefit from) income tax	18.0	(7.9)
Net income (loss)	$ 56.3	$ (33.4)
Earnings per common share, basic (in dollars per share)	$ 0.54	$ (0.36)
Earnings per common share, diluted (in dollars per share)	$ 0.54	$ (0.36)
Weighted average common shares outstanding, basic (in shares)	103,737,664	92,855,173
Weighted average common shares outstanding, diluted (in shares)	103,818,719	92,855,173