BUSINESS COMBINATIONS (Details 4) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Balance, beginning of year	$ 9,063	$ 15,578	$ 15,578
Accretion	1,487	4,466	9,658
Transfers to purchased non-covered other real estate owned	(1,243)	(1,094)
Transfer from covered loans due to loss-share expiration	0	0	1,665
Balance, ending of year	7,942	12,965	9,063
Non Covered Loan [Member]
Balance, beginning of year	771,554	674,239	674,239
Charge-offs, net of recoveries	(317)	(244)	(991)
Additions due to acquisitions	401,085	0	195,818
Accretion	2,647	3,111	10,590
Transfers to purchased non-covered other real estate owned	(1,243)	(1,094)	(4,473)
Transfer from covered loans due to loss-share expiration	0	0	50,568
Payments received	(43,807)	(32,920)	(154,666)
Other	0	0	469
Balance, ending of year	$ 1,129,919	$ 643,092	$ 771,554