CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 82,739,568	$ 58,752,036
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	4,388,093	2,940,923
Depreciation, amortization and accretion	(1,927,832)	1,220,878
Provision for loan losses	10,463,411	9,173,671
Gain on mortgage loans sold, net	(8,822,489)	(7,788,852)
Stock-based compensation expense	8,633,209	5,244,947
Deferred tax expense	15,371,727	1,750,526
Losses on dispositions of other real estate and other investments	36,874	218,568
Income from equity method investment	(16,577,455)	(14,791,834)
Excess tax benefit from stock compensation	(4,548,841)	(2,422,226)
Gain on other loans sold, net	(483,402)	(548,560)
Other loans held for sale:
Loans originated	(60,171,584)	(30,854,000)
Loans sold	71,874,960	22,079,777
Mortgage loans held for sale:
Loans originated	(268,698,182)	(195,638,601)
Loans sold	261,981,394	198,239,000
Increase in other assets	(4,092,485)	(18,585,336)
Increase (decrease) in other liabilities	(21,164,810)	30,286,044
Net cash provided by operating activities	69,002,156	59,276,961
Activities in securities available-for-sale:
Purchases	(611,442,128)	(265,495,464)
Sales	7,492,168	0
Maturities, prepayments and calls	118,629,440	104,509,440
Activities in securities held-to-maturity:
Purchases	0	(560,000)
Maturities, prepayments and calls	3,885,000	3,170,000
Increase in loans, net	(700,982,747)	(559,866,109)
Purchases of software, premises and equipment	(18,690,967)	(6,700,278)
Proceeds from sales of software, premises and equipment	0	1,949,036
Proceeds from sale of other real estate	2,910,226	2,323,953
Acquisitions, net of cash paid	155,141,674	0
Purchase of bank owned life insurance policies	(25,000,000)	0
Increase in equity method investment	0	(74,100,000)
Dividends received from equity method investment	14,916,867	21,824,256
Increase in other investments	(5,376,058)	(16,944,435)
Net cash used in investing activities	(1,058,516,525)	(789,889,601)
Financing activities:
Net increase in deposits	791,495,223	321,819,132
Net increase (decrease) in securities sold under agreements to repurchase	56,991,437	(5,767,418)
Advances from Federal Home Loan Bank:
Issuances	836,000,000	1,528,000,000
Payments/maturities	(517,034,260)	(1,045,064,801)
Increase (decrease) in other borrowings, net	(160,100)	87,976,401
Principal payments of capital lease obligation	(72,982)	0
Proceeds from common stock issuance, net	192,193,750	0
Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares	(709,045)	3,774,252
Excess tax benefit from stock compensation	0	2,422,226
Common stock dividends paid	(14,050,051)	(11,717,393)
Net cash provided by financing activities	1,344,653,972	881,442,399
Net increase in cash and cash equivalents	355,139,603	150,829,759
Cash and cash equivalents, beginning of period	183,645,420	320,951,333
Cash and cash equivalents, end of period	$ 538,785,023	$ 471,781,092