CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest income:
Loans, including fees	$ 43,695,658	$ 41,514,213
Securities:
Taxable	3,720,279	3,670,934
Tax-exempt	1,597,797	1,656,408
Federal funds sold and other	277,058	314,772
Total interest income	49,290,792	47,156,327
Interest expense:
Deposits	2,595,240	3,412,396
Securities sold under agreements to repurchase	30,515	77,816
Federal Home Loan Bank advances and other borrowings	757,222	907,641
Total interest expense	3,382,977	4,397,853
Net interest income	45,907,815	42,758,474
Provision for loan losses	487,638	2,172,404
Net interest income after provision for loan losses	45,420,177	40,586,070
Noninterest income:
Service charges on deposit accounts	2,790,968	2,480,244
Investment services	2,127,834	1,792,640
Insurance sales commissions	1,384,921	1,393,304
Gain on mortgage loans sold, net	952,222	1,813,488
Trust fees	1,145,751	944,332
Other noninterest income	4,334,360	3,478,348
Total noninterest income	12,736,056	11,902,356
Noninterest expense:
Salaries and employee benefits	21,749,960	19,572,356
Equipment and occupancy	5,709,030	5,113,050
Other real estate expense	651,152	720,962
Marketing and other business development	908,901	790,671
Postage and supplies	560,614	591,488
Amortization of intangibles	237,675	520,987
Other noninterest expense	3,832,221	5,130,495
Total noninterest expense	33,649,553	32,440,009
Income before income taxes	24,506,680	20,048,417
Income tax expense	8,139,557	6,600,292
Net income	$ 16,367,123	$ 13,448,125
Per share information:
Basic net income per common share (in dollars per share)	$ 0.47	$ 0.40
Diluted net income per common share (in dollars per share)	$ 0.47	$ 0.39
Weighted average shares outstanding:
Basic (in shares)	34,602,337	33,987,265
Diluted (in shares)	34,966,600	34,206,202