Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Interest and fees on loans	$ 120.0	$ 103.9	$ 352.3	$ 292.1
Interest and dividends on investment securities:
Taxable	15.1	13.9	45.9	41.0
Exempt from federal taxes	0.5	0.6	1.5	1.8
Interest on deposits in banks	5.7	2.8	14.3	6.9
Total interest income	141.3	121.2	414.0	341.8
Interest expense:
Interest on deposits	13.4	8.9	39.6	22.3
Interest on securities sold under repurchase agreements	1.0	0.7	3.1	1.8
Interest on other borrowed funds	0.0	0.1	0.0	0.2
Interest on other debt	0.3	0.4	1.0	0.9
Interest on subordinated debentures held by subsidiary trusts	1.1	1.1	3.5	3.0
Total interest expense	15.8	11.2	47.2	28.2
Net interest income	125.5	110.0	366.8	313.6
Provision for loan losses	2.6	2.0	10.1	7.0
Net interest income after provision for loan losses	122.9	108.0	356.7	306.6
Non-interest income:
Mortgage banking revenues	10.5	6.7	24.3	19.3
Investment securities gains (losses), net	0.1	0.0	0.1	0.0
Other income	4.0	4.5	13.4	11.0
Total non-interest income	40.8	36.2	114.7	109.0
Non-interest expense:
Salaries and wages	40.6	36.8	117.1	105.7
Employee benefits	11.9	11.9	40.3	35.5
Outsourced technology services	7.9	6.8	23.9	20.9
Occupancy, net	7.1	6.5	21.2	18.8
Furniture and equipment	3.3	3.5	10.2	9.5
OREO expense, net of income	(0.8)	0.2	(0.5)	0.3
Professional fees	3.5	1.9	7.7	5.2
FDIC insurance premiums	0.4	1.4	3.5	4.3
Mortgage servicing rights amortization	1.2	0.8	3.1	2.3
Core deposit intangibles amortization	3.0	2.0	8.3	5.5
Other expenses	17.4	15.8	50.8	48.1
Acquisition related expenses	3.8	3.1	19.6	5.4
Total non-interest expense	99.3	90.7	305.2	261.5
Income before income tax expense	64.4	53.5	166.2	154.1
Income tax expense	15.3	12.1	37.6	34.3
Net income	$ 49.1	$ 41.4	$ 128.6	$ 119.8
Earnings per common share, basic (in dollars per share)	$ 0.76	$ 0.71	$ 2.03	$ 2.10
Earnings per common share, diluted (in dollars per share)	$ 0.76	$ 0.71	$ 2.03	$ 2.09
Weighted average common shares outstanding, basic (in shares)	64,832,324	58,254,575	63,232,575	56,951,029
Weighted average common shares outstanding, diluted (in shares)	65,043,486	58,640,475	63,471,283	57,330,027
Payment services revenues
Non-interest income:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 10.8	$ 10.1	$ 30.7	$ 33.5
Wealth management revenues
Non-interest income:
Wealth management revenues	5.9	5.8	17.8	17.5
Service charges on deposit accounts
Non-interest income:
Revenue from Contract with Customer, Excluding Assessed Tax	5.3	5.7	15.7	16.6
Other service charges, commissions and fees
Non-interest income:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4.2	$ 3.4	$ 12.7	$ 11.1