CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 18,804,598	$ 9,876,571
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	3,879,647	3,673,938
Depreciation and amortization	4,923,028	5,650,951
Provision for loan losses	1,668,317	12,726,327
Gain on mortgage loan sales, net	(2,951,255)	(1,398,635)
(Gain) loss on sale of investment securities, net	(212,517)	(451,199)
Stock-based compensation expense	2,922,294	2,542,367
Deferred tax benefit	1,664,563	(568,101)
Losses on dispositions of other real estate and other investments	7,222,829	6,107,869
Excess tax benefit from stock compensation	(11,243)	(7,117)
Mortgage loans held for sale:
Loans originated	(222,373,087)	(136,038,263)
Loans sold	224,388,000	139,486,474
Decrease in other assets	18,852,041	19,894,737
(Decrease) increase in other liabilities	(2,652,747)	4,078,621
Net cash provided by operating activities	56,124,468	65,574,540
Activities in securities available-for-sale:
Purchases	(37,244,793)	(69,910,259)
Sales	32,632,321	51,116,046
Maturities, prepayments and calls	106,431,284	118,391,346
Activities in securities held-to-maturity:
Maturities, prepayments and calls	1,575,000	1,584,999
Increase in loans, net	(166,516,932)	(32,148,545)
Purchases of software, premises and equipment	(1,940,817)	(1,329,819)
Other investments	(1,149,065)	(255,349)
Net cash (used in) provided by investing activities	(66,213,002)	67,448,419
Financing activities:
Net increase (decrease) in deposits	55,480,883	(71,503,872)
Net decrease in securities sold under agreements to repurchase	(3,968,857)	(21,780,716)
Advances from Federal Home Loan Bank:
Issuances	285,000,000	0
Payments/maturities	(240,035,833)	(10,156,762)
Increase in other borrowings	25,000,000	0
Exercise of common stock options and stock appreciation rights	633,487	451,739
Excess tax benefit from stock compensation	11,243	7,117
Preferred dividends paid	(2,127,605)	(2,375,000)
Repurchase of preferred shares outstanding	(71,250,000)	0
Net cash provided by (used in) financing activities	48,743,318	(105,357,494)
Net increase in cash and cash equivalents	38,654,785	27,665,465
Cash and cash equivalents, beginning of period	172,163,040	188,586,181
Cash and cash equivalents, end of period	$ 210,817,824	$ 216,251,646