LOANS (Details 19) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 21,062	$ 21,157	$ 21,157
Provision for loan losses	681	1,069	5,264
Loans charged off	(1,814)	(1,648)	(9,133)
Recoveries of loans previously charged off	1,553	1,274	3,774
Balance	21,482	21,852	21,062
Loans individually evaluated for impairment				$ 5,142	$ 4,131	$ 4,817
Loans collectively evaluated for impairment				16,340	16,931	17,035
Balance	21,062	21,157	21,062	21,482	21,062	21,852
Individually evaluated for impairment				62,454	23,712	28,987
Collectively evaluated for impairment				4,168,502	3,697,437	2,631,383
Acquired with deteriorated credit quality				213,983	187,774	227,887
Ending balance				4,444,939	3,908,923	2,888,257
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,144	2,004	2,004
Provision for loan losses	788	(498)	(73)
Loans charged off	(406)	(392)	(1,438)
Recoveries of loans previously charged off	73	285	651
Balance	1,599	1,399	1,144
Loans individually evaluated for impairment				400	126	230
Loans collectively evaluated for impairment				1,199	1,018	1,169
Balance	1,144	2,004	1,144	1,599	1,144	1,399
Individually evaluated for impairment				799	323	324
Collectively evaluated for impairment				433,274	449,300	334,593
Acquired with deteriorated credit quality				0	0	0
Ending balance				434,073	449,623	334,917
Real Estate Construction And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	5,009	5,030	5,030
Provision for loan losses	(1,051)	347	278
Loans charged off	(155)	(97)	(622)
Recoveries of loans previously charged off	122	31	323
Balance	3,925	5,311	5,009
Loans individually evaluated for impairment				733	759	627
Loans collectively evaluated for impairment				3,192	4,250	4,684
Balance	5,009	5,030	5,009	3,925	5,009	5,311
Individually evaluated for impairment				1,604	1,958	2,982
Collectively evaluated for impairment				263,216	242,735	175,586
Acquired with deteriorated credit quality				0	0	0
Ending balance				264,820	244,693	178,568
Real estate - commercial & farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	7,994	8,823	8,823
Provision for loan losses	(669)	(56)	1,221
Loans charged off	(347)	(12)	(2,367)
Recoveries of loans previously charged off	121	15	317
Balance	7,099	8,770	7,994
Loans individually evaluated for impairment				873	1,074	2,123
Loans collectively evaluated for impairment				6,226	6,920	6,647
Balance	7,994	8,823	7,994	7,099	7,994	8,770
Individually evaluated for impairment				12,050	11,877	14,557
Collectively evaluated for impairment				1,142,837	1,093,114	932,717
Acquired with deteriorated credit quality				0	0	0
Ending balance				1,154,887	1,104,991	947,274
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,760	4,129	4,129
Provision for loan losses	25	1,090	2,067
Loans charged off	(468)	(268)	(1,587)
Recoveries of loans previously charged off	314	57	151
Balance	4,631	5,008	4,760
Loans individually evaluated for impairment				2,153	2,172	1,837
Loans collectively evaluated for impairment				2,478	2,588	3,171
Balance	4,760	4,129	4,760	4,631	4,760	5,008
Individually evaluated for impairment				9,540	9,554	11,124
Collectively evaluated for impairment				619,598	560,876	484,919
Acquired with deteriorated credit quality				0	0	0
Ending balance				629,138	570,430	496,043
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,574	1,171	1,171
Provision for loan losses	399	217	676
Loans charged off	(59)	(86)	(410)
Recoveries of loans previously charged off	25	62	137
Balance	1,939	1,364	1,574
Loans individually evaluated for impairment				0	0	0
Loans collectively evaluated for impairment				1,939	1,574	1,364
Balance	1,574	1,171	1,574	1,939	1,574	1,364
Individually evaluated for impairment				0	0	0
Collectively evaluated for impairment				45,089	37,140	42,618
Acquired with deteriorated credit quality				0	0	0
Ending balance				45,089	37,140	42,618
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	0	0	0
Provision for loan losses	361	401	751
Loans charged off	(72)	(563)	(1,759)
Recoveries of loans previously charged off	240	162	1,008
Balance	529	0	0
Loans individually evaluated for impairment				529	0	0
Loans collectively evaluated for impairment				0	0	0
Balance	0	0	0	529	0	0
Individually evaluated for impairment				21,429	0	0
Collectively evaluated for impairment				28,937	52,451	108,113
Acquired with deteriorated credit quality				79,913	85,078	137,632
Ending balance				38,961	56,705	97,212
Covered Loans [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				4,842	5,188	13,512
Covered Loans [Member] | Real Estate Construction And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				8,347	15,119	24,503
Covered Loans [Member] | Real estate - commercial & farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				10,264	20,508	35,493
Covered Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				15,457	15,830	23,585
Purchased Non Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	581	0	0
Provision for loan losses	828	(432)	344
Loans charged off	(307)	(230)	(950)
Recoveries of loans previously charged off	658	662	1,187
Balance	1,760	0	581
Loans individually evaluated for impairment				454	0	0
Loans collectively evaluated for impairment				1,306	581	0
Balance	$ 581	$ 0	$ 581	1,760	581	0
Individually evaluated for impairment				17,032	0	0
Collectively evaluated for impairment				1,635,551	1,261,821	552,837
Acquired with deteriorated credit quality				134,070	102,696	90,255
Ending balance				31,450	42,129	29,616
Purchased Non Covered Loans [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				2,632	3,103	1,331
Purchased Non Covered Loans [Member] | Real Estate Construction And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				3,599	8,987	2,153
Purchased Non Covered Loans [Member] | Real estate - commercial & farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				15,358	14,999	13,911
Purchased Non Covered Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance				$ 9,774	$ 14,946	$ 12,183