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Fair Value of Financial Instruments - Difference Between Fair Value and Principal Balance for Mortgage Loans Held for Sale Measured at Fair Value (Detail) (Mortgage Loans Held for Sale [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans Held for Sale [Member]
    
Assets And Liabilities Carrying Value And Fair Value [Line Items]    
Aggregate Fair Value of Mortgage Loans held for sale $ 94,759abcb_AggregateFairValueOfLoansHeldForSale
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember		 $ 67,278abcb_AggregateFairValueOfLoansHeldForSale
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember
Aggregate Unpaid Principal Balance 90,418abcb_AggregateUnpaidPrincipalBalanceOfItemsForWhichFairValueOptionWasElected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember		 65,522abcb_AggregateUnpaidPrincipalBalanceOfItemsForWhichFairValueOptionWasElected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember
Past due loans of 90 days or more 0us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember		 0us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember
Nonaccrual loans $ 0us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatusAggregatedDifference
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember		 $ 0us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatusAggregatedDifference
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= abcb_MortgageLoansHeldForSaleMember