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Derivative Instruments And Hedging Activities - Net Gains (Losses) Related to Derivative Financial Instruments (Detail) (Mortgage Banking Activity [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Forward Contracts Related to Mortgage Loans Held for Sale [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Mortgage banking activity $ (249)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= abcb_MortgageBankingActivityMember		 $ 98us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= abcb_MortgageBankingActivityMember		 $ (37)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= abcb_MortgageBankingActivityMember
Interest Rate Lock Commitments [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Mortgage banking activity $ 1,757us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementLocationAxis
= abcb_MortgageBankingActivityMember		 $ 1,082us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementLocationAxis
= abcb_MortgageBankingActivityMember		 $ 1,162us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementLocationAxis
= abcb_MortgageBankingActivityMember