Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income:
Interest and fees on loans	$ 191.7	$ 105.4	$ 343.4	$ 213.2
Interest and dividends on investment securities:
Taxable	48.8	15.8	78.1	31.6
Exempt from federal taxes	1.4	1.4	2.7	2.8
Interest on deposits in banks	3.4	0.7	5.1	1.0
Total interest income	245.3	123.3	429.3	248.6
Interest expense:
Interest on deposits	4.3	2.2	7.3	4.5
Interest on securities sold under repurchase agreements	0.3	0.1	0.6	0.2
Interest on long-term debt	1.4	1.5	3.1	3.0
Interest on subordinated debentures held by subsidiary trusts	1.4	0.7	2.4	1.4
Total interest expense	7.4	4.5	13.4	9.1
Net interest income	237.9	118.8	415.9	239.5
Provision for (reversal of) credit losses	(1.7)	0.0	59.6	(5.1)
Net interest income after provision for (reversal of) credit losses	239.6	118.8	356.3	244.6
Non-interest income:
Debt Securities, Available-for-sale, Gain (Loss)	(0.1)	(0.1)	(0.2)	(0.1)
Mortgage banking revenues	5.0	9.6	13.4	21.2
Other income	7.4	2.6	13.4	6.7
Total non-interest income	51.0	35.3	100.2	73.4
Non-interest expense:
Salaries and wages	74.8	41.6	134.8	80.6
Employee benefits	19.4	14.7	40.6	30.8
Outsourced technology services	12.8	8.4	24.1	16.5
Occupancy, net	11.2	7.1	21.2	14.4
Furniture and equipment	5.8	4.1	11.2	8.5
OREO expense, net of income	0.0	0.0	0.1	(0.1)
Professional fees	5.5	3.2	9.4	6.6
FDIC insurance premiums	2.8	1.5	6.1	3.1
Other intangibles amortization	4.1	2.5	7.7	5.0
Other expenses	28.1	15.9	51.3	32.0
Acquisition related expenses	45.8	0.0	111.0	0.0
Noninterest Expense	210.3	99.0	417.5	197.4
Income before income tax	80.3	55.1	39.0	120.6
Provision for income tax	16.2	12.6	8.3	26.7
Net income	$ 64.1	$ 42.5	$ 30.7	$ 93.9
Earnings per common share, basic (in dollars per share)	$ 0.59	$ 0.69	$ 0.30	$ 1.52
Earnings per common share, diluted (in dollars per share)	$ 0.59	$ 0.69	$ 0.30	$ 1.52
Weighted average common shares outstanding, basic (in shares)	109,106,891	61,657,593	101,025,926	61,624,917
Weighted average common shares outstanding, diluted (in shares)	109,131,718	61,727,821	101,076,331	61,723,142
Payment services revenues
Non-interest income:
Non-interest income	$ 19.5	$ 11.4	$ 34.3	$ 21.6
Wealth management revenues
Non-interest income:
Wealth management revenues	9.3	6.3	17.4	12.6
Service charges on deposit accounts
Non-interest income:
Non-interest income	6.3	3.9	14.0	7.7
Other service charges, commissions, and fees
Non-interest income:
Non-interest income	$ 3.6	$ 1.6	$ 7.9	$ 3.7