CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 51,733,929	$ 42,405,607
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	3,353,794	3,444,484
Depreciation and amortization	6,987,533	6,918,189
Provision for loan losses	1,593,180	5,631,408
Loss on sale of investment securities, net	(29,221)	1,466,475
Gain on mortgage loans sold, net	(4,256,451)	(5,130,411)
Stock-based compensation expense	3,969,973	3,027,231
Deferred tax benefit	(361,424)	(51,547)
(Gains) losses on dispositions of other real estate and other investments	(92,577)	2,889,742
Excess tax benefit from stock compensation	(1,526,772)	(232,776)
Mortgage loans held for sale:
Loans originated	(242,784,212)	(320,203,874)
Loans sold	240,761,000	349,567,000
Decrease in other assets	3,978,907	12,875,979
Decrease in other liabilities	(2,526,028)	(3,105,860)
Net cash provided by operating activities	60,801,631	99,501,647
Activities in securities available-for-sale:
Purchases	(97,806,318)	(182,289,872)
Sales	2,360,478	1,414,628
Maturities, prepayments and calls	86,531,771	111,542,890
Activities in securities held-to-maturity:
Purchases	0	(2,452,919)
Maturities, prepayments and calls	1,094,966	2,982,450
Increase in loans, net	(283,931,233)	(269,103,013)
Purchases of software, premises and equipment	(3,991,211)	(4,371,613)
Purchase of bank owned life insurance	0	(30,000,000)
Increase in other investments	31,553	(3,611,128)
Net cash used in investing activities	(295,709,994)	(375,888,577)
Financing activities:
Net decrease in deposits	128,858,023	318,355,000
Net increase (decrease) in securities sold under agreements to repurchase	(5,692,815)	(30,635,547)
Advances from Federal Home Loan Bank:
Issuances	585,000,000	624,000,000
Payments/maturities	(460,063,036)	(584,128,201)
Decrease in other borrowings	(1,875,000)	(6,875,000)
Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares	4,321,128	1,290,692
Excess tax benefit from stock compensation	1,526,772	232,776
Common stock dividends paid	(8,535,894)	0
Net cash provided by financing activities	243,539,178	322,239,720
Net decrease in cash and cash equivalents	8,630,815	45,852,790
Cash and cash equivalents, beginning of period	208,938,737	165,288,669
Cash and cash equivalents, end of period	$ 217,569,552	$ 211,141,459