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Other Real Estate Owned - Summary of Activity in Other Real Estate Owned (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Real Estate Owned, Disclosure of Detailed Components [Abstract]      
Beginning balance $ 33,160us-gaap_OtherRealEstate $ 33,351us-gaap_OtherRealEstate $ 33,351us-gaap_OtherRealEstate
Loans transferred to other real estate owned 2,444abcb_OtherRealEstateTransfersOfLoans 2,554abcb_OtherRealEstateTransfersOfLoans 11,972abcb_OtherRealEstateTransfersOfLoans
Net gains (losses) on sale and write-downs (958)abcb_OtherRealEstateNetGainsLossesOnSaleAndWriteDowns (750)abcb_OtherRealEstateNetGainsLossesOnSaleAndWriteDowns (4,585)abcb_OtherRealEstateNetGainsLossesOnSaleAndWriteDowns
Sales proceeds (2,307)us-gaap_OtherRealEstateDisposals (1,316)us-gaap_OtherRealEstateDisposals (7,578)us-gaap_OtherRealEstateDisposals
Ending balance $ 32,339us-gaap_OtherRealEstate $ 33,839us-gaap_OtherRealEstate $ 33,160us-gaap_OtherRealEstate