BUSINESS COMBINATIONS (Details 5) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Covered Loans Acquired Accretable Discounts [Line Items]
Balance, beginning of year	$ 9,063	$ 15,578	$ 15,578
Accretion	(2,647)	(3,111)
Transfer from covered loans due to loss-share expiration	0	0	1,665
Transfers between non-accretable and accretable discounts, net	366	1,853	4,808
Balance, ending of year	7,942	12,965	9,063
Non Covered Loan [Member]
Schedule Of Covered Loans Acquired Accretable Discounts [Line Items]
Balance, beginning of year	771,554	674,239	674,239
Additions due to acquisitions	401,085	0	195,818
Transfer from covered loans due to loss-share expiration	0	0	50,568
Balance, ending of year	1,129,919	643,092	771,554
Discount Accretion [Member] | Non Covered Loan [Member]
Schedule Of Covered Loans Acquired Accretable Discounts [Line Items]
Balance, beginning of year	24,785	25,716	25,716
Additions due to acquisitions	9,991	0	5,788
Accretion	(2,647)	(3,111)	(10,590)
Transfer from covered loans due to loss-share expiration	0	0	1,665
Accretable discounts removed due to charge-offs	(11)	(1,380)	(1,768)
Transfers between non-accretable and accretable discounts, net	353	(996)	3,974
Balance, ending of year	$ 32,471	$ 20,229	$ 24,785