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Consolidated Statements of Income - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest income:        
Interest and fees on loans   $ 404.3 $ 324.7 $ 259.2
Interest and dividends on investment securities:        
Taxable   55.4 42.8 32.2
Exempt from federal taxes   2.4 3.2 3.4
Interest on deposits in banks   11.3 7.1 2.6
Total interest income   473.4 377.8 297.4
Interest expense:        
Interest on deposits   32.6 21.4 12.7
Interest on securities sold under repurchase agreements   2.7 1.3 0.4
Interest on other borrowed funds   0.2 0.5 0.0
Interest on long-term debt   1.3 1.7 1.8
Interest on subordinated debentures held by subsidiary trusts   4.1 3.1 2.7
Total interest expense   40.9 28.0 17.6
Net interest income   432.5 349.8 279.8
Provision for loan losses   8.6 11.0 10.0
Net interest income after provision for loan losses   423.9 338.8 269.8
Non-interest income:        
Fees and Commissions, Mortgage Banking and Servicing $ 24.9   28.9 37.2
Loss on termination of interest rate swap 0.0   (1.1) 0.0
Investment securities (losses) gains, net (0.1) (0.1) 0.7 0.3
Other income 15.1   14.3 10.0
Non-recurring litigation recovery   0.0 0.0 4.2
Total non-interest income   143.3 141.8 136.5
Non-interest expense:        
Salaries and wages   146.4 122.7 108.7
Employee benefits   47.9 37.6 35.2
Information Technology and Data Processing   28.7 25.1 20.5
Occupancy, Net   25.4 22.4 17.7
Equipment Expense   12.7 11.5 9.6
FDIC insurance premiums   6.9 6.8 5.0
Federal Deposit Insurance Corporation Premium Expense   5.6 4.7 4.5
Mortgage servicing rights impairment recovery   3.1 3.0 3.0
OREO expense, net of income   0.0 (0.1) 0.0
Other Real Estate Owned Expense Net Of Income   0.3 0.4 0.0
Core deposit intangibles amortization   7.9 5.5 3.4
Other expenses   63.6 57.1 50.6
Acquisition related expenses   12.4 27.2 2.8
Total non-interest expense   360.9 323.9 261.0
Income before income tax expense   206.3 156.7 145.3
Income tax expense   46.1 50.2 49.6
Net income   $ 160.2 $ 106.5 $ 95.7
Basic earnings per common share (in dollars per share)   $ 2.77 $ 2.07 $ 2.15
Diluted earnings per common share (in dollars per share)   $ 2.75 $ 2.05 $ 2.13
Credit and Debit Card [Member]        
Interest expense:        
Revenue from Contract with Customer, Excluding Assessed Tax 43.3   $ 43.3 $ 34.4
Financial Service, Other [Member]        
Interest expense:        
Revenue from Contract with Customer, Excluding Assessed Tax 15.1   13.3 11.5
Investment Advisory, Management and Administrative Service [Member]        
Non-interest income:        
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions 23.2   21.1 20.5
Deposit Account [Member]        
Interest expense:        
Revenue from Contract with Customer, Excluding Assessed Tax $ 21.8   $ 21.3 $ 18.4