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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Total interest income	$ 122,749	$ 121,119	$ 89,946	$ 79,512	$ 79,564	$ 76,322	$ 71,411	$ 67,050	$ 413,326	$ 294,347	$ 239,065
Expense
Interest expense	23,195	22,081	13,947	10,711	10,041	9,467	8,254	6,460	69,934	34,222	19,694
Other expense									35,446	28,078	25,308
Total noninterest expense	74,813	72,077	67,995	58,263	58,916	63,675	55,739	52,691	293,647	231,936	215,835
Income (loss) before taxes and equity in undistributed income of subsidiaries	50,553	54,761	11,810	34,366	31,213	28,300	33,402	31,367	151,490	124,282	105,246
Income tax benefit	(7,017)	(13,317)	(2,423)	(7,706)	(22,063)	(8,142)	(10,315)	(10,214)	(30,463)	(50,734)	(33,146)
Net income	$ 43,536	$ 41,444	$ 9,387	$ 26,660	$ 9,150	$ 20,158	$ 23,087	$ 21,153	121,027	73,548	72,100
Ameris Bancorp
Income
Dividends from subsidiaries									46,000	0	34,631
Other income									4,726	132	208
Total interest income									50,726	132	34,839
Expense
Interest expense									12,670	9,065	6,280
Other expense									8,578	4,612	2,825
Total noninterest expense									21,248	13,677	9,105
Income (loss) before taxes and equity in undistributed income of subsidiaries									29,478	(13,545)	25,734
Income tax benefit									5,051	10,622	2,972
Income (loss) before equity in undistributed income of subsidiaries									34,529	(2,923)	28,706
Equity in undistributed income of subsidiaries									86,498	76,471	43,394
Net income									$ 121,027	$ 73,548	$ 72,100