INVESTMENT IN US PREMIUM FINANCE HOLDING COMPANY - Summary of Investment in USPF (Details) - US Premium Financing Holding Company $ / shares in Units, $ in Thousands	Jan. 18, 2017 USD ($) $ / shares shares
Schedule of Cost-method Investments [Line Items]
Ameris common shares issued (in shares) \| shares	128,572
Price per share of the Company's common stock (in dollars per share) \| $ / shares	$ 45.45
Fair value of consideration transferred \| $	$ 5,844

Fair value portion of investments accounted under the cost method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75030709&loc=d3e39828-111592

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