CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest income:
Loans, including fees	$ 41,514,213	$ 38,637,719
Securities:
Taxable	3,670,934	4,929,284
Tax-exempt	1,656,408	1,703,146
Federal funds sold and other	314,772	553,939
Total interest income	47,156,327	45,824,088
Interest expense:
Deposits	3,412,396	4,827,476
Securities sold under agreements to repurchase	77,816	155,576
Federal Home Loan Bank advances and other borrowings	907,641	1,337,031
Total interest expense	4,397,853	6,320,083
Net interest income	42,758,474	39,504,005
Provision for loan losses	2,172,404	1,034,245
Net interest income after provision for loan losses	40,586,070	38,469,760
Noninterest income:
Service charges on deposit accounts	2,480,244	2,323,962
Investment services	1,792,640	1,646,778
Insurance sales commissions	1,393,304	1,287,560
Trust fees	944,332	795,435
Gain on mortgage loans sold, net	1,813,488	1,494,472
Gain on sale of investment securities, net	0	113,600
Other noninterest income	3,478,348	2,287,531
Total noninterest income	11,902,356	9,949,338
Noninterest expense:
Salaries and employee benefits	19,572,356	19,792,566
Equipment and occupancy	5,113,050	5,008,655
Other real estate expense	720,962	4,676,064
Marketing and other business development	790,671	785,325
Postage and supplies	591,488	563,294
Amortization of intangibles	520,987	686,067
Other noninterest expense	5,130,495	4,307,735
Total noninterest expense	32,440,009	35,819,706
Income before income taxes	20,048,417	12,599,392
Income tax expense	6,600,292	4,234,438
Net income	13,448,125	8,364,954
Preferred stock dividends	0	900,519
Accretion on preferred stock discount	0	258,647
Net income available to common stockholders	$ 13,448,125	$ 7,205,788
Per share information:
Basic net income per common share available to common stockholders (in dollars per share)	$ 0.40	$ 0.21
Diluted net income per common share available to common stockholders (in dollars per share)	$ 0.39	$ 0.21
Weighted average shares outstanding:
Basic (in shares)	33,987,265	33,811,871
Diluted (in shares)	34,206,202	34,423,898