CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)	Common Stock [Member]	Common Stock [Member] Bankers Healthcare Group, LLC [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Bankers Healthcare Group, LLC [Member]	Retained Earnings [Member]	Retained Earnings [Member] Bankers Healthcare Group, LLC [Member]	Accumulated Other Comp. Income (Loss), Net [Member]	Accumulated Other Comp. Income (Loss), Net [Member] Bankers Healthcare Group, LLC [Member]	Total	Bankers Healthcare Group, LLC [Member]
Balances at Dec. 31, 2014	$ 35,732,483		$ 561,431,449		$ 201,371,081		$ 4,158,368		$ 802,693,381
Balances (in shares) at Dec. 31, 2014	35,732,483
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options and related tax benefits	$ 65,270		2,924,061		0		0		2,989,331
Exercise of employee common stock options and related tax benefits (in shares)	65,270
Common dividends paid	$ 0		0		(4,304,125)		0		(4,304,125)
Issuance of restricted common shares, net of forfeitures	$ 121,877		(121,877)		0		0		0
Issuance of restricted common shares, net of forfeitures (in shares)	121,877
Restricted shares withheld for taxes and related tax benefit	$ (54,963)		(2,056,229)		0		0		(2,111,192)
Restricted shares withheld for taxes and related tax benefit (in shares)	(54,963)
Compensation expense for restricted shares	$ 0		1,653,662		0		0		1,653,662
Net income	0		0		21,842,711		0		21,842,711
Other comprehensive income (loss)	0		0		0		1,386,878		1,386,878
Ending Balances at Mar. 31, 2015	$ 35,864,667		563,831,066		218,909,667		5,545,246		824,150,646
Balances (in shares) at Mar. 31, 2015	35,864,667
Balances at Dec. 31, 2015	$ 40,906,064		839,617,050		278,573,408		(3,485,222)		1,155,611,300
Balances (in shares) at Dec. 31, 2015	40,906,064
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options and related tax benefits	$ 152,949		3,699,161		0		0		3,852,110
Exercise of employee common stock options and related tax benefits (in shares)	152,949
Common dividends paid	$ 0		0		(5,791,835)		0		(5,791,835)
Issuance of restricted common shares, net of forfeitures	$ 127,462		(127,462)		0		0		0
Issuance of restricted common shares, net of forfeitures (in shares)	127,462
Common stock issued in conjunction with acquisition		$ 860,470		$ 38,939,530		$ 0		$ 0		$ 39,800,000
Common stock issued in conjunction with acquisition (in shares)		860,470
Restricted shares withheld for taxes and related tax benefit	$ (51,990)		(741,561)		0		0		(793,551)
Restricted shares withheld for taxes and related tax benefit (in shares)	(51,990)
Compensation expense for restricted shares	$ 0		2,628,788		0		0		2,628,788
Net income	0		0		27,965,264		0		27,965,264
Other comprehensive income (loss)	0		0		0		5,507,765		5,507,765
Ending Balances at Mar. 31, 2016	$ 41,994,955		$ 884,015,506		$ 300,746,837		$ 2,022,543		$ 1,228,779,841
Balances (in shares) at Mar. 31, 2016	41,994,955