CONDENSED FINANCIAL INFORMATION OF AMERIS BANCORP (PARENT COMPANY ONLY) - Schedule of Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OPERATING ACTIVITIES
Net income	$ 358,685	$ 269,105	$ 346,540
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	13,440	9,950	6,706
Decrease in interest payable	(11,176)	26,946	6,217
Increase in tax payable	29,846	2,271	5,177
Provision for deferred taxes	(20,078)	(20,468)	(35,677)
Gain on sale of other investments	(12,314)	0	(270)
Change attributable to other operating activities	(25,496)	22,157	(4,991)
Net cash provided by operating activities	154,193	568,959	1,062,473
INVESTING ACTIVITIES
Net cash used in investing activities	(846,682)	(338,194)	(4,874,530)
Financing Activities, net of effects of business combinations
Purchase of treasury shares	(7,954)	(20,346)	(22,421)
Dividends paid - common stock	(41,460)	(41,649)	(41,610)
Repayment of other borrowings	(6,526,963)	(17,207,845)	(2,814,576)
Proceeds from exercise of stock options	0	476	2,799
Net cash provided by (used in) financing activities	745,562	(181,593)	865,532
Net increase (decrease) in cash, cash equivalents and restricted cash	53,073	49,172	(2,946,525)
Cash, cash equivalents and restricted cash at beginning of period	1,167,304	1,118,132	4,064,657
Cash, cash equivalents and restricted cash at end of period	1,220,377	1,167,304	1,118,132
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	540,270	418,445	86,643
Cash received during the year for income taxes	102,511	101,328	133,894
Ameris Bancorp
OPERATING ACTIVITIES
Net income	358,685	269,105	346,540
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	13,440	9,950	6,706
Undistributed earnings of subsidiaries	(240,883)	(121,331)	(320,866)
Decrease in interest payable	(204)	(319)	(961)
Increase in tax payable	1,540	3,021	8,596
Provision for deferred taxes	(788)	(1,165)	(649)
Gain on sale of other investments	(24)	0	(270)
Change attributable to other operating activities	2,179	1,188	200
Total adjustments	(224,740)	(108,656)	(307,244)
Net cash provided by operating activities	133,945	160,449	39,296
INVESTING ACTIVITIES
Net (increase) decrease in other investments	0	0	213
Investment in subsidiary	0	0	(65,000)
Net cash used in investing activities	0	0	(64,787)
Financing Activities, net of effects of business combinations
Purchase of treasury shares	(7,954)	(20,346)	(22,421)
Dividends paid - common stock	(41,460)	(41,649)	(41,610)
Repayment of other borrowings	(107,874)	(86,850)	0
Proceeds from exercise of stock options	0	476	2,799
Net cash provided by (used in) financing activities	(157,288)	(148,369)	(61,232)
Net increase (decrease) in cash, cash equivalents and restricted cash	(23,343)	12,080	(86,723)
Cash, cash equivalents and restricted cash at beginning of period	165,179	153,099	239,822
Cash, cash equivalents and restricted cash at end of period	141,836	165,179	153,099
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	22,708	24,887	23,131
Cash received during the year for income taxes	$ (10,338)	$ (12,593)	$ (16,499)