LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 20) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				$ 21,157				$ 22,377	$ 21,157	$ 22,377	$ 23,593
Provision for loan losses	$ 553	$ 986	$ 2,656	1,069	$ 888	$ 1,669	$ 1,365	1,726	5,264	5,648	11,486
Loans charged off									(9,133)	(9,560)	(14,823)
Recoveries of loans previously charged off									3,774	2,692	2,121
Balance	21,062				21,157				21,062	21,157	22,377
Loans individually evaluated for impairment												$ 4,131	$ 3,890	$ 3,585
Loans collectively evaluated for impairment												16,931	17,267	18,792
Balance	21,062			21,157	21,157			22,377	21,157	21,157	22,377	21,062	21,157	22,377
Individually evaluated for impairment												23,712	27,649	39,203
Collectively evaluated for impairment												3,697,437	2,563,652	2,134,029
Acquired with deteriorated credit quality												187,774	244,098	284,212
Ending balance												3,908,923	2,835,399	2,457,444
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				2,004				1,823	2,004	1,823	2,439
Provision for loan losses									(73)	1,427	711
Loans charged off									(1,438)	(1,567)	(1,759)
Recoveries of loans previously charged off									651	321	432
Balance	1,144				2,004				1,144	2,004	1,823
Loans individually evaluated for impairment												126	375	356
Loans collectively evaluated for impairment												1,018	1,629	1,467
Balance	1,144			2,004	2,004			1,823	2,004	2,004	1,823	1,144	2,004	1,823
Individually evaluated for impairment												323	490	3,457
Collectively evaluated for impairment												449,300	319,164	240,916
Acquired with deteriorated credit quality												0	0	0
Ending balance												449,623	319,654	244,373
Real Estate Construction And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				5,030				5,538	5,030	5,538	5,343
Provision for loan losses									278	(265)	1,742
Loans charged off									(622)	(592)	(2,020)
Recoveries of loans previously charged off									323	349	473
Balance	5,009				5,030				5,009	5,030	5,538
Loans individually evaluated for impairment												759	743	407
Loans collectively evaluated for impairment												4,250	4,287	5,131
Balance	5,009			5,030	5,030			5,538	5,030	5,030	5,538	5,009	5,030	5,538
Individually evaluated for impairment												1,958	3,709	3,581
Collectively evaluated for impairment												242,735	157,798	142,790
Acquired with deteriorated credit quality												0	0	0
Ending balance												244,693	161,507	146,371
Real Estate Commercial And Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				8,823				8,393	8,823	8,393	9,157
Provision for loan losses									1,221	3,444	2,777
Loans charged off									(2,367)	(3,288)	(3,571)
Recoveries of loans previously charged off									317	274	30
Balance	7,994				8,823				7,994	8,823	8,393
Loans individually evaluated for impairment												1,074	1,861	1,427
Loans collectively evaluated for impairment												6,920	6,962	6,966
Balance	7,994			8,823	8,823			8,393	8,823	8,823	8,393	7,994	8,823	8,393
Individually evaluated for impairment												11,877	14,546	15,240
Collectively evaluated for impairment												1,093,114	892,978	793,083
Acquired with deteriorated credit quality												0	0	0
Ending balance												1,104,991	907,524	808,323
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				4,129				6,034	4,129	6,034	5,898
Provision for loan losses									2,067	(452)	4,463
Loans charged off									(1,587)	(1,707)	(5,215)
Recoveries of loans previously charged off									151	254	888
Balance	4,760				4,129				4,760	4,129	6,034
Loans individually evaluated for impairment												2,172	911	1,395
Loans collectively evaluated for impairment												2,588	3,218	4,639
Balance	4,760			4,129	4,129			6,034	4,129	4,129	6,034	4,760	4,129	6,034
Individually evaluated for impairment												9,554	8,904	16,925
Collectively evaluated for impairment												560,876	447,202	349,957
Acquired with deteriorated credit quality												0	0	0
Ending balance												570,430	456,106	366,882
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				1,171				589	1,171	589	756
Provision for loan losses									676	567	254
Loans charged off									(410)	(471)	(719)
Recoveries of loans previously charged off									137	486	298
Balance	1,574				1,171				1,574	1,171	589
Loans individually evaluated for impairment												0	0	0
Loans collectively evaluated for impairment												1,574	1,171	589
Balance	1,574			1,171	1,171			589	1,171	1,171	589	1,574	1,171	589
Individually evaluated for impairment												0	0	0
Collectively evaluated for impairment												37,140	45,090	52,505
Acquired with deteriorated credit quality												0	0	0
Ending balance												37,140	45,090	52,505
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				0				0	0	0	0
Provision for loan losses									751	843	1,539
Loans charged off									(1,759)	(1,851)	(1,539)
Recoveries of loans previously charged off									1,008	1,008	0
Balance	0				0				0	0	0
Loans individually evaluated for impairment												0	0	0
Loans collectively evaluated for impairment												0	0	0
Balance	0			0	0			0	0	0	0	0	0	0
Individually evaluated for impairment												0	0	0
Collectively evaluated for impairment												52,451	122,248	173,190
Acquired with deteriorated credit quality												85,078	149,031	217,047
Ending balance												56,705	65,555	390,237
Covered Loans [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												5,188	10,845
Covered Loans [Member] | Real Estate Construction And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												15,119	11,621
Covered Loans [Member] | Real Estate Commercial And Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												20,508	23,349
Covered Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												15,830	19,629
Purchased Non Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				0				0	0	0	0
Provision for loan losses									344	84	0
Loans charged off									(950)	(84)	0
Recoveries of loans previously charged off									1,187	0	0
Balance	581				0				581	0	0
Loans individually evaluated for impairment												0	0	0
Loans collectively evaluated for impairment												581	0	0
Balance	$ 581			$ 0	$ 0			$ 0	$ 0	$ 0	$ 0	581	0	0
Individually evaluated for impairment												0	0	0
Collectively evaluated for impairment												1,261,821	579,172	381,588
Acquired with deteriorated credit quality												102,696	95,067	67,165
Ending balance												42,129	26,885	$ 448,753
Purchased Non Covered Loans [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												3,103	499
Purchased Non Covered Loans [Member] | Real Estate Construction And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												8,987	2,210
Purchased Non Covered Loans [Member] | Real Estate Commercial And Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												14,999	13,520
Purchased Non Covered Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance												$ 14,946	$ 10,487