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Other Real Estate Owned - Summary of Activity in Other Real Estate Owned (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Real Estate Owned, Disclosure of Detailed Components [Abstract]    
Beginning balance $ 33,351us-gaap_OtherRealEstate $ 39,850us-gaap_OtherRealEstate
Loans transferred to other real estate owned 11,972abcb_OtherRealEstateTransfersOfLoans 9,137abcb_OtherRealEstateTransfersOfLoans
Net gains (losses) on sale and write-downs (4,585)abcb_OtherRealEstateNetGainsLossesOnSaleAndWriteDowns (5,883)abcb_OtherRealEstateNetGainsLossesOnSaleAndWriteDowns
Sales proceeds (7,578)us-gaap_OtherRealEstateDisposals (9,753)us-gaap_OtherRealEstateDisposals
Ending balance $ 33,160us-gaap_OtherRealEstate $ 33,351us-gaap_OtherRealEstate