Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Interest and fees on loans	$ 112.0	$ 111.4
Interest and dividends on investment securities:
Taxable	17.2	15.1
Exempt from federal taxes	0.5	0.5
Interest on deposits in banks	2.5	3.6
Total interest income	132.2	130.6
Interest expense:
Interest on deposits	7.3	12.1
Interest on securities sold under repurchase agreements	0.5	1.0
Interest on other debt	0.3	0.3
Interest on subordinated debentures held by subsidiary trusts	1.0	1.2
Total interest expense	9.1	14.6
Net interest income	123.1	116.0
Provision for credit losses	29.0	3.7
Net interest income after provision for credit losses	94.1	112.3
Non-interest income:
Mortgage banking revenues	13.6	4.1
Investment securities gains (losses), net	0.0	0.0
Other income	3.6	4.3
Total non-interest income	43.7	33.2
Non-interest expense:
Salaries and wages	39.9	35.1
Employee benefits	14.2	14.4
Outsourced technology services	7.8	7.9
Occupancy, net	7.3	7.0
Furniture and equipment	2.8	3.5
OREO expense, net of income	(0.5)	0.1
Professional fees	2.7	3.2
FDIC insurance premiums	1.6	1.5
Mortgage servicing rights amortization	1.5	0.9
Mortgage servicing rights impairment	2.9	0.0
Core deposit intangibles amortization	2.9	2.3
Other expenses	17.2	14.3
Acquisition related expenses	0.0	2.3
Total non-interest expense	100.3	92.5
Income before income tax expense	37.5	53.0
Income tax expense	8.2	11.4
Net income	$ 29.3	$ 41.6
Earnings per common share, basic (in dollars per share)	$ 0.45	$ 0.69
Earnings per common share, diluted (in dollars per share)	$ 0.45	$ 0.69
Weighted average common shares outstanding, basic (in shares)	64,790,186	60,311,171
Weighted average common shares outstanding, diluted (in shares)	64,937,107	60,598,070
Payment services revenues
Non-interest income:
Non-interest income	$ 10.2	$ 9.4
Wealth management revenues
Non-interest income:
Wealth management revenues	6.2	6.1
Service charges on deposit accounts
Non-interest income:
Non-interest income	5.4	5.0
Other service charges, commissions and fees
Non-interest income:
Non-interest income	$ 4.7	$ 4.3