CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans, including fees	$ 49,466,706	$ 43,695,658
Securities:
Taxable	3,444,599	3,720,279
Tax-exempt	1,483,307	1,597,797
Federal funds sold and other	283,978	277,058
Total interest income	54,678,590	49,290,792
Interest expense:
Deposits	2,430,742	2,595,240
Securities sold under agreements to repurchase	30,917	30,515
Federal Home Loan Bank advances and other borrowings	948,552	757,222
Total interest expense	3,410,211	3,382,977
Net interest income	51,268,379	45,907,815
Provision for loan losses	315,091	487,638
Net interest income after provision for loan losses	50,953,288	45,420,177
Noninterest income:
Service charges on deposit accounts	2,912,549	2,790,968
Investment services	2,259,440	2,127,834
Insurance sales commissions	1,512,618	1,384,921
Gain on mortgage loans sold, net	1,941,254	1,234,872
Loss on sale of investment securities, net	6,003	0
Trust fees	1,311,985	1,145,751
Other noninterest income	5,348,151	4,048,017
Income from other investments	3,201,302	0
Total noninterest income	18,493,302	12,732,363
Noninterest expense:
Salaries and employee benefits	23,530,860	21,749,960
Equipment and occupancy	6,046,223	5,709,030
Other real estate expense	395,288	651,152
Marketing and other business development	959,750	908,901
Postage and supplies	649,251	560,614
Amortization of intangibles	227,414	237,675
Other noninterest expense	5,022,236	3,828,528
Total noninterest expense	36,831,022	33,645,860
Income before income taxes	32,615,568	24,506,680
Income tax expense	10,772,857	8,139,557
Net income	$ 21,842,711	$ 16,367,123
Per share information:
Basic net income per common share (in dollars per share)	$ 0.62	$ 0.47
Diluted net income per common share (in dollars per share)	$ 0.62	$ 0.47
Weighted average shares outstanding:
Basic (in shares)	35,041,203	34,602,337
Diluted (in shares)	35,380,529	34,966,600