OTHER REAL ESTATE OWNED - Summary of Activity in Purchased Other Real Estate Owned (Details) - Purchased Other Real Estate Owned - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Real Estate Owned
January 1	$ 12,540	$ 19,344
Loans transferred to other real estate owned	4,294	6,262
Acquired in acquisitions	0	1,838
Portion of gains (losses) on sale and write-downs payable to (receivable from) the FDIC under loss-sharing agreements	76	0
Net gains (losses) on sale and write-downs recorded in statement of income	265	(568)
Sales proceeds	(7,229)	(11,750)
Ending balance	$ 9,946	$ 15,126

Amount of gain loss on sale and write down payable (receivable) of FDIC under loss sharing agreements.

No definition available.

Name:	abcb_GainLossOnSaleAndWriteDownPayableReceivableFromFdicUnderLossSharingAgreemets
Namespace Prefix:	abcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Other Real Estate Non Covered Net Gains Losses On Sale And Write Downs

+ References

No definition available.

+ Details

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

- Definition

Other Real Estate Non Covered Transfers Of Loans

+ References

No definition available.

+ Details

Name:	abcb_OtherRealEstateNonCoveredTransfersOfLoans
Namespace Prefix:	abcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount of other real estate not covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherRealEstateNonCovered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Additions of other real estate not covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherRealEstateNonCoveredAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disposals of other real estate not covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherRealEstateNonCoveredDisposals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstateOwnedValuationAllowanceRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=abcb_PurchasedOtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: