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Assets Acquired in FDIC-Assisted Acquisitions - Changes in FDIC Loss Share Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Combinations [Abstract]    
Beginning balance $ 65,441us-gaap_FDICIndemnificationAsset $ 159,724us-gaap_FDICIndemnificationAsset
Payments received from FDIC (22,494)us-gaap_FDICIndemnificationAssetCashPaymentsReceived (68,822)us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Accretion (amortization) (18,449)abcb_FederalDepositInsuranceCorporationLossShareReceivableAccretionAmortization (34,533)abcb_FederalDepositInsuranceCorporationLossShareReceivableAccretionAmortization
Change in clawback liability (1,222)abcb_FederalDepositInsuranceCorporationClawbackLiability (3,398)abcb_FederalDepositInsuranceCorporationClawbackLiability
Charge-offs on covered loans 3,372abcb_ChargeOffsOnCoveredLoans 6,156abcb_ChargeOffsOnCoveredLoans
Write downs of covered other real estate owned 4,771us-gaap_OtherRealEstateCoveredValuationAdjustments 13,117us-gaap_OtherRealEstateCoveredValuationAdjustments
Reimbursable expenses on covered assets 1,078abcb_ExpensesOnCoveredAssetsReimbursableByFederalDepositInsuranceCorporation 5,820abcb_ExpensesOnCoveredAssetsReimbursableByFederalDepositInsuranceCorporation
Other activity, net (1,146)abcb_FederalDepositInsuranceCorporationLossShareReceivableOtherActivityNet (12,623)abcb_FederalDepositInsuranceCorporationLossShareReceivableOtherActivityNet
Ending balance $ 31,351us-gaap_FDICIndemnificationAsset $ 65,441us-gaap_FDICIndemnificationAsset