Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Investment securities	$ 90,392	$ 91,086	$ 93,052
Residential real estate loans	33,410	32,153	30,721
Commercial loans	188,949	164,966	145,631
Consumer and other loans	31,402	31,476	30,515
Total interest income	344,153	319,681	299,919
Interest Expense
Deposits	18,402	16,138	13,195
Securities sold under agreements to repurchase	1,207	1,021	865
Federal Home Loan Bank advances	6,221	8,841	9,570
Federal funds purchased and other borrowed funds	67	81	199
Subordinated debentures	3,734	3,194	3,137
Total interest expense	29,631	29,275	26,966
Net Interest Income	314,522	290,406	272,953
Provision for loan losses	2,333	2,284	1,912
Net interest income after provision for loan losses	312,189	288,122	271,041
Non-Interest Income
Service charges and other fees	62,405	59,286	56,043
Miscellaneous loan fees and charges	4,613	4,276	4,696
Gain on sale of loans	33,606	26,389	19,797
(Loss) gain on sale of investments	(1,463)	19	(188)
Other income	8,157	8,791	9,954
Total non-interest income	107,318	98,761	90,302
Non-Interest Expense
Compensation and employee benefits	151,697	134,409	118,571
Occupancy and equipment	25,979	25,505	22,718
Advertising and promotions	8,433	8,661	7,912
Data processing	14,800	11,477	11,387
Other real estate owned	2,895	3,693	2,568
Regulatory assessments and insurance	4,780	5,283	5,064
Core deposit intangible amortization	2,970	2,964	2,811
Other expense	47,160	44,765	41,648
Total non-interest expense	258,714	236,757	212,679
Income Before Income Taxes	160,793	150,126	148,664
Federal and state income tax expense	39,662	33,999	35,909
Net Income	$ 121,131	$ 116,127	$ 112,755
Basic earnings per share	$ 1.59	$ 1.54	$ 1.51
Diluted earnings per share	1.59	1.54	1.51
Dividends declared per share	$ 1.10	$ 1.05	$ 0.98
Average outstanding shares - basic	76,278,463	75,542,455	74,641,957
Average outstanding shares - diluted	76,341,836	75,595,581	74,687,315