ASSETS ACQUIRED IN FDIC-ASSISTED ACQUISITIONS (Details 1) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Covered Assets [Line Items]
Covered loans	$ 205,757	$ 345,172	$ 296,724
Less: Fair value adjustments	14,736	31,583	25,445
Total covered loans	191,021	313,589	271,279
OREO	14,452	33,315	23,408
Less: Fair value adjustments	2,249	4,432	3,501
Total covered OREO	12,203	28,883	19,907
Total covered assets	203,224	342,472	291,186
FDIC indemnification asset	4,506	38,233	31,351	$ 65,441
American United Bank [Member]
Covered Assets [Line Items]
Covered loans	0	8,902	0
Less: Fair value adjustments	0	0	0
Total covered loans	0	8,902	0
OREO	0	666	0
Less: Fair value adjustments	0	0	0
Total covered OREO	0	666	0
Total covered assets	0	9,568	0
FDIC indemnification asset	115	882	188
United Security Bank [Member]
Covered Assets [Line Items]
Covered loans	3,686	13,576	4,350
Less: Fair value adjustments	17	351	150
Total covered loans	3,669	13,225	4,200
OREO	165	2,134	165
Less: Fair value adjustments	0	48	0
Total covered OREO	165	2,086	165
Total covered assets	3,834	15,311	4,365
FDIC indemnification asset	(1,453)	(439)	(1,197)
Satilla Community Bank [Member]
Covered Assets [Line Items]
Covered loans	5,269	28,534	26,686
Less: Fair value adjustments	174	789	602
Total covered loans	5,095	27,745	26,084
OREO	0	2,665	2,849
Less: Fair value adjustments	0	308	389
Total covered OREO	0	2,357	2,460
Total covered assets	5,095	30,102	28,544
FDIC indemnification asset	280	1,855	1,828
First Bank of Jacksonville [Member]
Covered Assets [Line Items]
Covered loans	13,826	22,421	21,243
Less: Fair value adjustments	991	2,346	1,825
Total covered loans	12,835	20,075	19,418
OREO	984	1,578	632
Less: Fair value adjustments	171	90	0
Total covered OREO	813	1,488	632
Total covered assets	13,648	21,563	20,050
FDIC indemnification asset	679	2,138	1,885
Darby Bank and Trust [Member]
Covered Assets [Line Items]
Covered loans	44,112	75,683	64,338
Less: Fair value adjustments	3,107	8,531	6,437
Total covered loans	41,005	67,152	57,901
OREO	5,044	9,804	6,655
Less: Fair value adjustments	624	1,024	514
Total covered OREO	4,420	8,780	6,141
Total covered assets	45,425	75,932	64,042
FDIC indemnification asset	(1,737)	9,337	6,860
Tifton Banking Company [Member]
Covered Assets [Line Items]
Covered loans	16,813	25,577	23,487
Less: Fair value adjustments	481	1,465	1,117
Total covered loans	16,332	24,112	22,370
OREO	1,480	3,552	2,388
Less: Fair value adjustments	116	394	367
Total covered OREO	1,364	3,158	2,021
Total covered assets	17,696	27,270	24,391
FDIC indemnification asset	(2,225)	2,542	3,287
High Trust Bank [Member]
Covered Assets [Line Items]
Covered loans	45,345	54,317	52,699
Less: Fair value adjustments	3,999	5,761	5,120
Total covered loans	41,346	48,556	47,579
OREO	2,985	3,477	3,670
Less: Fair value adjustments	955	1,239	1,283
Total covered OREO	2,030	2,238	2,387
Total covered assets	43,376	50,794	49,966
FDIC indemnification asset	4,108	7,152	6,459
One Georgia Bank [Member]
Covered Assets [Line Items]
Covered loans	28,309	48,889	42,971
Less: Fair value adjustments	1,971	4,160	3,785
Total covered loans	26,338	44,729	39,186
OREO	320	2,244	2,244
Less: Fair value adjustments	39	39	39
Total covered OREO	281	2,205	2,205
Total covered assets	26,619	46,934	41,391
FDIC indemnification asset	1,517	5,803	3,906
Central Bank of Georgia [Member]
Covered Assets [Line Items]
Covered loans	48,397	67,273	60,950
Less: Fair value adjustments	3,996	8,180	6,409
Total covered loans	44,401	59,093	54,541
OREO	3,474	7,195	4,805
Less: Fair value adjustments	344	1,290	909
Total covered OREO	3,130	5,905	3,896
Total covered assets	47,531	64,998	58,437
FDIC indemnification asset	$ 3,222	$ 8,963	$ 8,135