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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitments to extend credit | $ 3,816,556 | $ 4,412,818
Unused home equity lines of credit | 414,894 | 386,574
Financial standby letters of credit | 39,194 | 37,546
Mortgage interest rate lock commitments | $ 321,262 | $ 171,750

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- Definition Commitments to extend credit. + References No definition available. + Details
Name: | abcb_CommitmentsToExtendCredit
Namespace Prefix: | abcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Letter of credit maximum issuance. + References No definition available. + Details
Name: | abcb_LetterOfCreditMaximumIssuance
Namespace Prefix: | abcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Mortgage interest rate lock commitments. + References No definition available. + Details
Name: | abcb_MortgageInterestRateLockCommitments
Namespace Prefix: | abcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the amount of unused home equity lines of credit. + References No definition available. + Details
Name: | abcb_UnusedHomeEquityLinesOfCredit
Namespace Prefix: | abcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration