CONDENSED FINANCIAL INFORMATION OF AMERIS BANCORP (PARENT COMPANY ONLY) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net income	$ 376,913	$ 261,988	$ 161,441
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	7,948	3,810	3,424
(Decrease) increase in interest payable	(1,175)	(6,036)	5,855
(Increase) decrease in tax receivable	7,005	(12,062)	(3,597)
Provision for deferred taxes	38,411	(7,929)	22,821
Change attributable to other operating activities	247	(97,730)	40,758
Net cash provided by (used in) operating activities	9,140	798,396	(940,211)
INVESTING ACTIVITIES
Proceeds from bank owned life insurance	1,309	3,381	7,429
Net cash used in investing activities	(420,984)	(1,200,726)	(487,087)
Financing Activities, net of effects of business combinations
Purchase of treasury shares	(9,439)	(7,995)	(18,410)
Dividends paid - common stock	(41,798)	(41,685)	(24,675)
Proceeds from other borrowings	0	7,202,981	5,236,572
Repayment of other borrowings	(296,325)	(8,176,491)	(4,141,349)
Proceeds from exercise of stock options	4,532	2,262	5,139
Net cash provided by financing activities	2,359,195	1,897,787	1,369,620
Net increase (decrease) in cash, cash equivalents and restricted cash	1,947,351	1,495,457	(57,678)
Cash, cash equivalents and restricted cash at beginning of period	2,117,306	621,849	679,527
Cash, cash equivalents and restricted cash at end of period	4,064,657	2,117,306	621,849
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	48,960	94,786	125,373
Cash received during the year for income taxes	71,807	98,609	35,865
Ameris Bancorp
OPERATING ACTIVITIES
Net income	376,913	261,988	161,441
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	7,948	3,810	3,424
Undistributed earnings of subsidiaries	(260,575)	(188,769)	(116,608)
(Decrease) increase in interest payable	(36)	847	33
(Increase) decrease in tax receivable	(6,238)	6,001	(6,860)
Provision for deferred taxes	1,694	(1,225)	1,595
Gain on sale of equity security	0	0	(61)
Change attributable to other operating activities	3,678	7,652	(2,396)
Total adjustments	(253,529)	(171,684)	(120,873)
Net cash provided by (used in) operating activities	123,384	90,304	40,568
INVESTING ACTIVITIES
(Increase) decrease in other investments	(4,500)	(8,012)	282
Repayment of advances to subsidiary bank	0	0	10,000
Investment in subsidiary	0	(75,000)	0
Net cash proceeds received from acquisitions	0	0	34,939
Proceeds from bank owned life insurance	0	2,383	0
Net cash used in investing activities	(4,500)	(80,629)	45,221
Financing Activities, net of effects of business combinations
Purchase of treasury shares	(9,439)	(7,995)	(18,410)
Dividends paid - common stock	(41,798)	(41,685)	(24,675)
Proceeds from other borrowings	0	108,149	117,572
Repayment of other borrowings	0	(5,155)	(70,000)
Proceeds from exercise of stock options	4,532	2,262	5,139
Net cash provided by financing activities	(46,705)	55,576	9,626
Net increase (decrease) in cash, cash equivalents and restricted cash	72,179	65,251	95,415
Cash, cash equivalents and restricted cash at beginning of period	167,643	102,392	6,977
Cash, cash equivalents and restricted cash at end of period	239,822	167,643	102,392
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	19,646	16,769	16,173
Cash received during the year for income taxes	$ (2,367)	$ (10,000)	$ 0