CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest income:
Loans, including fees	$ 39,288,048	$ 38,905,155	$ 77,925,767	$ 77,258,636
Securities:
Taxable	4,453,956	6,479,280	9,383,240	12,840,179
Tax-exempt	1,647,852	1,837,811	3,350,998	3,773,699
Federal funds sold and other	563,638	566,874	1,117,577	1,140,880
Total interest income	45,953,494	47,789,120	91,777,582	95,013,394
Interest expense:
Deposits	4,298,849	8,306,751	9,126,325	17,730,992
Securities sold under agreements to repurchase	115,450	345,444	271,026	727,013
Federal Home Loan Bank advances and other borrowings	1,354,132	1,341,546	2,691,163	2,739,377
Total interest expense	5,768,431	9,993,741	12,088,514	21,197,382
Net interest income	40,185,063	37,795,379	79,689,068	73,816,012
Provision for loan losses	634,072	6,587,189	1,668,317	12,726,327
Net interest income after provision for loan losses	39,550,991	31,208,190	78,020,751	61,089,685
Noninterest income:
Service charges on deposit accounts	2,439,376	2,330,206	4,763,338	4,591,663
Investment services	1,610,883	1,637,426	3,257,661	3,145,512
Insurance sales commissions	1,141,163	1,004,246	2,428,723	2,053,478
Gain on mortgage loans sold, net	1,456,783	789,258	2,951,255	1,398,635
Gain (loss) on sale of investment securities, net	98,917	610,302	212,517	451,199
Trust fees	770,239	769,935	1,565,674	1,499,923
Other noninterest income	2,392,485	2,668,041	4,680,016	4,993,061
Total noninterest income	9,909,846	9,809,414	19,859,184	18,133,471
Noninterest expense:
Salaries and employee benefits	19,237,178	18,523,531	39,029,744	36,447,153
Equipment and occupancy	5,053,111	5,060,014	10,061,766	10,066,724
Other real estate expense	3,104,276	3,825,608	7,780,340	8,159,726
Marketing and other business development	739,774	766,422	1,525,099	1,520,173
Postage and supplies	615,725	545,097	1,179,019	1,034,974
Amortization of intangibles	686,067	715,905	1,372,134	1,431,809
Other noninterest expense	4,479,403	4,920,766	8,787,138	10,397,612
Total noninterest expense	33,915,534	34,357,343	69,735,240	69,058,171
Income before income taxes	15,545,303	6,660,261	28,144,695	10,164,985
Income tax expense	5,105,659	288,414	9,340,097	288,414
Net income	10,439,644	6,371,847	18,804,598	9,876,571
Preferred stock dividends	760,349	1,200,694	1,660,868	2,388,194
Accretion on preferred stock discount	1,894,525	327,657	2,153,172	633,631
Net income available to common stockholders	$ 7,784,770	$ 4,843,496	$ 14,990,558	$ 6,854,746
Per share information:
Basic net income per common share available to common stockholders (in dollars per share)	$ 0.23	$ 0.14	$ 0.44	$ 0.21
Diluted net income per common share available to common stockholders (in dollars per share)	$ 0.23	$ 0.14	$ 0.44	$ 0.20
Weighted average shares outstanding:
Basic (in shares)	33,885,779	33,454,229	33,848,825	33,410,385
Diluted (in shares)	34,470,794	34,095,636	34,447,526	34,054,746