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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Interest income:    
Interest and fees on loans $ 69,441 $ 52,384
Interest and dividends on taxable investments 15,525 13,566
Interest on nontaxable investments 3,438 4,008
Total interest income 88,404 69,958
Interest expense:    
Interest on deposits 2,132 1,730
Interest on borrowings 480 149
Interest on subordinated debt held by unconsolidated subsidiary trusts 1,168 805
Total interest expense 3,780 2,684
Net interest income 84,624 67,274
Provision for loan losses 3,679 1,828
Net interest income after provision for loan losses 80,945 65,446
Noninterest revenues:    
Deposit service fees 19,177 14,707
Other banking services 1,243 1,159
Employee benefit services 23,006 17,189
Insurance revenues 7,359 6,400
Wealth management services 6,706 4,861
Gain on sales of investment securities 0 2
Total noninterest revenues 57,491 44,318
Noninterest expenses:    
Salaries and employee benefits 51,859 42,907
Occupancy and equipment 10,531 8,196
Data processing and communications 8,742 8,521
Amortization of intangible assets 4,798 2,768
Legal and professional fees 2,781 2,414
Office supplies and postage 1,879 1,674
Business development and marketing 2,059 2,081
FDIC insurance premiums 752 753
Acquisition expenses (8) 1,716
Other expenses 2,938 2,545
Total noninterest expenses 86,331 73,575
Income before income taxes 52,105 36,189
Income taxes 11,999 9,932
Net income $ 40,106 $ 26,257
Basic earnings per share (in dollars per share) $ 0.78 $ 0.58
Diluted earnings per share (in dollars per share) 0.78 0.57
Cash dividends declared per share (in dollars per share) $ 0.34 $ 0.32