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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitments to extend credit | $ 3,768,159 | $ 3,578,227
Unused home equity lines of credit | 456,812 | 437,304
Financial standby letters of credit | 45,080 | 39,507
Mortgage interest rate lock commitments | $ 339,782 | $ 192,528

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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