Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cash Transactions:
Interest paid				$ 29,310,536	$ 14,722,572
Income taxes paid, net				25,035,510	22,364,686
Noncash Transactions:
Loans charged-off to the allowance for loan losses		$ 5,157,000	$ 7,146,000	10,320,665	16,372,819
Loans foreclosed upon and transferred to other real estate owned				1,520,444	2,464,945
Loans foreclosed upon and transferred to other assets				446,487	1,673,946
Common stock issued in connection with equity-method investment (in shares)				$ 0	$ 39,694,036
Common stock issued in connection with acquisitions (in shares)	[1]			1,858,132,809	0

[1] See Note 2 to these consolidated financial statements for more detailed information.