CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income	$ 27,965,264	$ 21,842,711
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	1,303,239	1,152,427
Depreciation and amortization	(428,254)	2,165,601
Provision for loan losses	3,893,570	315,091
Gain on mortgage loans sold, net	(3,567,551)	(1,941,254)
Gain on sale of investment securities	0	(6,003)
Stock-based compensation expense	2,628,788	1,653,662
Deferred tax (expense) benefit	921,718	1,046,983
(Gains) losses on dispositions of other real estate and other investments	(32,400)	(389,731)
Gains (losses) from equity method investment	(5,147,524)	(3,201,302)
Excess tax benefit from stock compensation	(159,168)	(1,348,751)
Change in other loans held for sale	(10,504,481)	0
Mortgage loans held for sale:
Loans originated	(147,888,687)	(98,711,742)
Loans sold	163,949,000	95,782,000
Increase in other assets	(6,736,913)	(7,631,523)
Decrease in other liabilities	(2,169,127)	(5,480,950)
Net cash provided by operating activities	24,027,474	5,247,219
Activities in securities available-for-sale:
Purchases	(102,041,878)	(64,826,118)
Sales	0	216,300
Maturities, prepayments and calls	28,996,005	29,890,467
Activities in securities held-to-maturity:
Purchases	0	(1,035,995)
Maturities, prepayments and calls	148,426	235,000
Increase in loans, net	(289,043,266)	(65,558,107)
Purchases of software, premises and equipment	(2,849,721)	(1,222,077)
Increase in equity-method investment	(74,100,000)	(75,000,000)
Dividends received from equity-method investment	4,920,103	0
(Increase) decrease in other investments	(1,918,978)	(122,500)
Net cash used in investing activities	(435,889,309)	(177,423,030)
Financing activities:
Net increase in deposits	109,015,688	6,704,511
Net decrease in securities sold under agreements to repurchase	(16,282,804)	(25,941,606)
Advances from Federal Home Loan Bank:
Issuances	631,000,000	455,370,280
Payments/maturities	(315,015,246)	(195,385,928)
Increase (decrease) in other borrowings, net	67,344,645	39,375,000
Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares	3,058,559	878,138
Excess tax benefit from stock compensation	159,168	1,348,751
Common stock dividends paid	(5,791,835)	(4,304,125)
Net cash provided by financing activities	473,488,175	278,045,021
Net increase in cash and cash equivalents	61,626,340	105,869,210
Cash and cash equivalents, beginning of period	320,951,333	187,907,510
Cash and cash equivalents, end of period	$ 382,577,673	$ 293,776,720