CONDENSED FINANCIAL INFORMATION OF AMERIS BANCORP (PARENT COMPANY ONLY) - Condensed Statements of Cash Flows (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
OPERATING ACTIVITIES
Net income	$ 43,536	$ 41,444	$ 9,387	$ 26,660	$ 9,150	$ 20,158	$ 23,087	$ 21,153	$ 121,027	$ 73,548	$ 72,100
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense									6,241	3,316	2,261
Increase (decrease) in interest payable									2,411	1,757	446
Decrease (increase) in tax receivable									4,032	(473)	(8,328)
Provision for deferred taxes									1,374	12,430	847
Other operating activities									(10,761)	10,895	(5,128)
FINANCING ACTIVITIES
Issuance of common stock									0	88,656	0
Purchase of treasury shares									(2,062)	(886)	(1,225)
Dividends paid - common stock									(16,405)	(14,650)	(8,584)
Proceeds from other borrowings									1,530,000	1,837,692	635,886
Repayment of other borrowings									(1,844,258)	(2,079,554)	(231,020)
Net change in cash and cash equivalents									348,869	132,273	(192,178)
Cash and cash equivalents at beginning of year				139,313					139,313
Cash and cash equivalents at end of year	172,036				139,313				172,036	139,313
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest									67,523	32,465	19,248
Cash paid (received) during the year for income taxes									20,026	38,939	40,575
Ameris Bancorp
OPERATING ACTIVITIES
Net income									121,027	73,548	72,100
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense									6,241	3,316	2,261
Undistributed earnings of subsidiaries									(86,498)	(76,471)	(43,394)
Increase (decrease) in interest payable									313	1,142	(63)
Decrease (increase) in tax receivable									1,436	5,176	(3,224)
Provision for deferred taxes									195	(4,620)	508
Other operating activities									(2,051)	1,230	(528)
Total adjustments									(80,364)	(70,227)	(44,440)
Net cash provided by operating activities									40,663	3,321	27,660
INVESTING ACTIVITIES
Investment in subsidiary									0	(110,000)	0
Net cash proceeds received from (paid for) acquisitions									(90,542)	0	(23,205)
Net cash used in investing activities									(90,542)	(110,000)	(23,205)
FINANCING ACTIVITIES
Issuance of common stock									0	88,656	0
Purchase of treasury shares									(2,062)	(886)	(1,225)
Dividends paid - common stock									(16,405)	(14,650)	(8,584)
Proceeds from other borrowings									70,000	73,692	14,000
Repayment of other borrowings									0	(38,850)	(15,000)
Proceeds from exercise of stock options									914	2,669	964
Net cash provided by (used in) financing activities									52,447	110,631	(9,845)
Net change in cash and cash equivalents									2,568	3,952	(5,390)
Cash and cash equivalents at beginning of year				$ 4,409				$ 457	4,409	457	5,847
Cash and cash equivalents at end of year	$ 6,977				$ 4,409				6,977	4,409	457
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest									12,357	7,923	6,343
Cash paid (received) during the year for income taxes									$ (7,500)	$ (11,000)	$ 0