INVESTMENT SECURITIES - Schedule of Gain (Loss) on Securities (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Net realized gains on sales of securities available for sale	$ 37	$ 37
Unrealized holding losses on equity securities	(123)	0
Total gain (loss) on securities	$ (86)	$ 37

Debt Securities, Available-For-Sale, Realized Gain (Loss)

No definition available.

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Namespace Prefix:	abcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration