CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income	$ 33,537,102	$ 27,758,657
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	2,154,065	2,373,927
Depreciation and amortization	4,598,989	4,622,942
Provision for loan losses	741,986	4,946,452
Loss on sale of investment securities, net	0	25,241
Gain on mortgage loans sold, net	(2,903,475)	(3,803,942)
Stock-based compensation expense	2,581,483	1,995,809
Deferred tax benefit	(136,855)	67,794
(Gains) losses on dispositions of other real estate and other investments	141,913	1,877,964
Excess tax benefit from stock compensation	(1,166,463)	(140,181)
Mortgage loans held for sale:
Loans originated	(153,548,739)	(226,714,093)
Loans sold	144,711,000	243,750,000
Decrease in other assets	(1,504,523)	10,576,616
Decrease in other liabilities	(4,207,922)	(12,608,365)
Net cash provided by operating activities	24,998,561	54,728,821
Activities in securities available-for-sale:
Purchases	(96,556,556)	(128,922,089)
Sales	1,273,528	1,213,584
Maturities, prepayments and calls	59,975,601	77,932,668
Activities in securities held-to-maturity:
Purchases	0	(2,045,030)
Maturities, prepayments and calls	864,028	2,325,000
Increase in loans, net	(171,994,156)	(221,126,597)
Purchases of software, premises and equipment	(3,265,513)	(3,388,292)
Purchase of bank owned life insurance	0	(30,000,000)
Increase in other investments	(178,118)	(3,325,587)
Net cash used in investing activities	(209,881,186)	(307,336,343)
Financing activities:
Net decrease in deposits	118,040,619	81,390,021
Net increase (decrease) in securities sold under agreements to repurchase	(8,192,656)	2,678,252
Advances from Federal Home Loan Bank:
Issuances	410,000,000	324,038,282
Payments/maturities	(330,047,151)	(74,091,731)
Decrease in other borrowings	(1,250,000)	(6,250,000)
Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares	3,014,285	584,892
Excess tax benefit from stock compensation	1,166,463	140,181
Common stock dividends paid	(5,679,659)	0
Net cash provided by financing activities	187,051,901	328,489,897
Net decrease in cash and cash equivalents	2,169,276	75,882,375
Cash and cash equivalents, beginning of period	208,938,737	165,288,669
Cash and cash equivalents, end of period	$ 211,108,013	$ 241,171,044