CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net income	$ 16,367,123	$ 13,448,125
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	957,133	988,811
Depreciation and amortization	2,258,990	2,432,535
Provision for loan losses	487,638	2,172,404
Gain on mortgage loans sold, net	(952,222)	(1,813,488)
Stock-based compensation expense	1,201,111	962,969
Deferred tax benefit	(16,406)	(698,661)
(Gains) losses on dispositions of other real estate and other investments	13,112	(866,306)
Excess tax benefit from stock compensation	(1,099,570)	(28,628)
Mortgage loans held for sale:
Loans originated	(61,458,365)	(107,845,659)
Loans sold	61,290,000	120,569,000
Decrease in other assets	527,594	3,050,703
Decrease in other liabilities	(6,576,105)	(8,339,670)
Net cash provided by operating activities	13,000,033	24,032,135
Activities in securities available-for-sale:
Purchases	(57,753,116)	(65,204,465)
Sales	0	0
Maturities, prepayments and calls	23,192,675	43,551,916
Activities in securities held-to-maturity:
Purchases	0	0
Maturities, prepayments and calls	860,000	75,868
Increase in loans, net	(40,306,647)	(63,167,119)
Purchases of software, premises and equipment	(604,626)	(1,442,076)
Purchase of bank owned life insurance	0	(30,000,000)
Increase in other investments	(2,216)	(303,750)
Net cash used in investing activities	(74,613,930)	(116,489,626)
Financing activities:
Net decrease in deposits	(32,895,938)	(112,293,132)
Net increase (decrease) in securities sold under agreements to repurchase	(2,372,676)	14,432,033
Advances from Federal Home Loan Bank:
Issuances	175,000,000	240,000,000
Payments/maturities	(115,016,116)	(115,036,641)
Decrease in other borrowings	(625,000)	(625,000)
Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares	1,247,220	222,200
Excess tax benefit from stock compensation	1,099,570	28,628
Common stock dividends paid	(2,824,493)	0
Net cash provided by financing activities	23,612,567	26,728,088
Net decrease in cash and cash equivalents	(38,001,330)	(65,729,403)
Cash and cash equivalents, beginning of period	208,938,737	165,288,669
Cash and cash equivalents, end of period	$ 170,937,407	$ 99,559,266