CONDENSED FINANCIAL INFORMATION OF AMERIS BANCORP (PARENT COMPANY ONLY) - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income
Total interest income	$ 79,564	$ 76,322	$ 71,411	$ 67,050	$ 62,956	$ 62,210	$ 59,340	$ 54,559	$ 294,347	$ 239,065	$ 190,393
Expense
Interest expense	10,041	9,467	8,254	6,460	5,677	5,143	4,751	4,123	34,222	19,694	14,856
Other expense									28,078	25,308	24,405
Total noninterest expense	58,916	63,675	55,739	52,691	54,660	53,199	52,359	49,241	231,936	215,835	199,115
Income (loss) before taxes and equity in undistributed income of subsidiaries	31,213	28,300	33,402	31,367	25,164	31,921	29,720	18,441	124,282	105,246	56,744
Income tax benefit	(22,063)	(8,142)	(10,315)	(10,214)	(6,987)	(10,364)	(9,671)	(6,124)	(50,734)	(33,146)	(15,897)
Net income	$ 9,150	$ 20,158	$ 23,087	$ 21,153	$ 18,177	$ 21,557	$ 20,049	$ 12,317	73,548	72,100	40,847
Ameris Bancorp
Income
Dividends from subsidiaries									0	34,631	10,000
Other income									132	208	59
Total interest income									132	34,839	10,059
Expense
Interest expense									9,065	6,280	4,813
Other expense									4,612	2,825	1,521
Total noninterest expense									13,677	9,105	6,334
Income (loss) before taxes and equity in undistributed income of subsidiaries									(13,545)	25,734	3,725
Income tax benefit									10,622	2,972	2,382
Income (loss) before equity in undistributed income of subsidiaries									(2,923)	28,706	6,107
Equity in undistributed income of subsidiaries									76,471	43,394	34,740
Net income									$ 73,548	$ 72,100	$ 40,847