Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Feb. 29, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-13901
Entity Registrant Name	AMERIS BANCORP
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1456434
Entity Address, Address Line One	3490 Piedmont Road N.E., Suite 1550
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30305
City Area Code	404
Local Phone Number	639-6500
Title of 12(b) Security	Common Stock, par value $1 per share
Trading Symbol	ABCB
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,820
Entity Common Stock, Shares Outstanding		69,336,749
Documents Incorporated by Reference	None
Amendment Flag	true
Amendment Description	This Form 10-K/A amends Ameris Bancorp’s Annual Report on Form 10-K for the year ended December 31, 2019 (the "Original Filing"), as filed with the Securities and Exchange Commission on March 9, 2020 (the "Original Filing Date").We are filing this Form 10-K/A to amend the report of Crowe LLP ("Crowe") relating to the effectiveness of our internal control over financial reporting included in Item 15 of the Original Filing (the "Audit Report") to include certain omitted language on the exclusion of Fidelity Southern Corporation from the scope of Crowe's audit of internal control over financial reporting. This amendment to the Audit Report does not affect Crowe's unqualified opinion on our consolidated financial statements or Crowe's adverse opinion on the effectiveness of our internal control over financial reporting as of December 31, 2019.In addition to amending the Audit Report as described above, Part IV, Item 15 of the Form 10-K/A includes: (1) a new consent of Crowe as Exhibit 23.1 thereto; and (2) new certifications of our chief executive officer and chief financial officer as Exhibits 31.1, 31.2, 32.1 and 32.2 thereto.No other changes were made to the Original Filing. This Form 10-K/A speaks as of the Original Filing Date, does not reflect events that may have occurred subsequent to the Original Filing Date and, except as described above, does not modify or update in any way disclosures made in the Original Filing.
Entity Central Index Key	0000351569
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31