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Assets Acquired in FDIC-Assisted Acquisitions - Schedule of Changes in Accretable Discounts Related Acquired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Combinations [Abstract]    
Balance, beginning of year $ 25,493us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ 16,698us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
Accretion (22,188)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAccretion (42,208)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAccretion
Transfers between non-accretable and accretable discounts, net 12,273abcb_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesNonAccretableAndAccretableDiscountsNet 51,003abcb_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesNonAccretableAndAccretableDiscountsNet
Balance, end of year $ 15,578us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ 25,493us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield