Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Investment securities	$ 91,086	$ 93,052	$ 74,512
Residential real estate loans	32,153	30,721	29,525
Commercial loans	164,966	145,631	127,450
Consumer and other loans	31,476	30,515	32,089
Total interest income	319,681	299,919	263,576
Interest Expense
Deposits	16,138	13,195	13,870
Securities sold under agreements to repurchase	1,021	865	867
Federal Home Loan Bank advances	8,841	9,570	10,610
Federal funds purchased and other borrowed funds	81	199	206
Subordinated debentures	3,194	3,137	3,205
Total interest expense	29,275	26,966	28,758
Net Interest Income	290,406	272,953	234,818
Provision for loan losses	2,284	1,912	6,887
Net interest income after provision for loan losses	288,122	271,041	227,931
Non-Interest Income
Service charges and other fees	57,321	54,089	49,478
Miscellaneous loan fees and charges	4,276	4,696	4,982
Gain on sale of loans	26,389	19,797	28,517
Gain (loss) on sale of investments	19	(188)	(299)
Other income	10,756	11,908	10,369
Total non-interest income	98,761	90,302	93,047
Non-Interest Expense
Compensation and employee benefits	134,409	118,571	104,221
Occupancy and equipment	31,149	27,498	24,875
Advertising and promotions	8,661	7,912	6,913
Data processing	5,833	6,607	4,493
Other real estate owned	3,693	2,568	7,196
Regulatory assessments and insurance	5,283	5,064	6,362
Core deposit intangible amortization	2,964	2,811	2,401
Other expense	44,765	41,648	38,856
Total non-interest expense	236,757	212,679	195,317
Income Before Income Taxes	150,126	148,664	125,661
Federal and state income tax expense	33,999	35,909	30,017
Net Income	$ 116,127	$ 112,755	$ 95,644
Basic earnings per share	$ 1.54	$ 1.51	$ 1.31
Diluted earnings per share	1.54	1.51	1.31
Dividends declared per share	$ 1.05	$ 0.98	$ 0.60
Average outstanding shares - basic	75,542,455	74,641,957	73,191,713
Average outstanding shares - diluted	75,595,581	74,687,315	73,260,278