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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income
Total interest income	$ 194,076	$ 188,361	$ 129,028	$ 124,929	$ 122,749	$ 121,119	$ 89,946	$ 79,512	$ 636,394	$ 413,326	$ 294,347
Expense
Interest expense	38,725	39,592	27,377	25,534	23,195	22,081	13,947	10,711	131,228	69,934	34,222
Other expense									53,484	35,607	28,311
Total noninterest expense									471,937	293,647	231,936
Income (loss) before taxes and equity in undistributed income of subsidiaries	82,207	27,076	50,968	51,333	50,553	54,761	11,810	34,366	211,584	151,490	124,282
Income tax benefit	(20,959)	(5,692)	(12,064)	(11,428)	(7,017)	(13,317)	(2,423)	(7,706)	(50,143)	(30,463)	(50,734)
Net income	$ 61,248	$ 21,384	$ 38,904	$ 39,905	$ 43,536	$ 41,444	$ 9,387	$ 26,660	161,441	121,027	73,548
Ameris Bancorp
Income
Dividends from subsidiaries									67,200	46,000	0
Other income									493	4,726	132
Total interest income									67,693	50,726	132
Expense
Interest expense									16,264	12,670	9,065
Other expense									12,199	8,578	4,612
Total noninterest expense									28,463	21,248	13,677
Income (loss) before taxes and equity in undistributed income of subsidiaries									39,230	29,478	(13,545)
Income tax benefit									5,603	5,051	10,622
Income (loss) before equity in undistributed income of subsidiaries									44,833	34,529	(2,923)
Equity in undistributed income of subsidiaries									116,608	86,498	76,471
Net income									$ 161,441	$ 121,027	$ 73,548