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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Total interest income	$ 178,783	$ 179,934	$ 185,018	$ 182,768	$ 194,076	$ 188,361	$ 129,028	$ 124,929	$ 726,503	$ 636,394	$ 413,326
Expense
Interest expense	15,327	17,396	21,204	34,823	38,725	39,592	27,377	25,534	88,750	131,228	69,934
Other expense									75,780	53,484	35,607
Income before income tax expense	125,993	150,182	40,845	23,224	82,207	27,076	50,968	51,333	340,244	211,584	151,490
Income tax benefit	(31,708)	(34,037)	(8,609)	(3,902)	(20,959)	(5,692)	(12,064)	(11,428)	(78,256)	(50,143)	(30,463)
Net income	$ 94,285	$ 116,145	$ 32,236	$ 19,322	$ 61,248	$ 21,384	$ 38,904	$ 39,905	261,988	161,441	121,027
Ameris Bancorp
Income
Dividends from subsidiaries									93,000	67,200	46,000
Other income									910	493	4,726
Total interest income									93,910	67,693	50,726
Expense
Interest expense									17,616	16,264	12,670
Other expense									8,300	12,199	8,578
Total noninterest expense									25,916	28,463	21,248
Income before income tax expense									67,994	39,230	29,478
Income tax benefit									5,225	5,603	5,051
Income before equity in undistributed income of subsidiaries									73,219	44,833	34,529
Equity in undistributed income of subsidiaries									188,769	116,608	86,498
Net income									$ 261,988	$ 161,441	$ 121,027