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Other Borrowings - Summary of Other Borrowings (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Daily Rate Credit From Federal Home Loan Bank [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
90-day LIBOR interest rate at period end 0.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_DailyRateCreditFromFederalHomeLoanBankMember		  
Federal Home Loan Bank Advances [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
90-day LIBOR interest rate at period end 0.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 0.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Maturity period of advances Jan. 24, 2014 Jan. 24, 2014
Revolving Credit Facility 1 [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Interest rate description 90-day LIBOR plus 3.50% (3.73% at December 31, 2014)  
Interest rate, margin to be added 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= abcb_RevolvingCreditFacilityOneMember		  
90-day LIBOR interest rate at period end 3.73%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_RevolvingCreditFacilityOneMember		  
Maturity period of Federal Home Loan Bank advances 2016-08  
Revolving Credit Facility [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Interest rate description 90-day LIBOR plus 4.00% (4.24% at December 31, 2013) 90-day LIBOR plus 4.00% (4.24% at December 31, 2013)
Interest rate, margin to be added 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
90-day LIBOR interest rate at period end 4.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		 4.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
Maturity period of Federal Home Loan Bank advances 2016-08 2016-08
Correspondent Bank Advances [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
90-day LIBOR interest rate at period end 4.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_CorrespondentBankAdvancesMember		  
Maturity period of advances Nov. 27, 2017  
Subordinated Debt One [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Interest rate description 90-day LIBOR plus 1.60% (1.84% at December 31, 2013) 90-day LIBOR plus 1.60% (1.84% at December 31, 2013)
Interest rate, margin to be added 1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtOneMember		 1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtOneMember
90-day LIBOR interest rate at period end 1.84%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtOneMember		 1.84%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtOneMember
Maturity period of Federal Home Loan Bank advances 2016-06 2016-06
Subordinated Debt Two [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Interest rate description 90-day LIBOR plus 1.75% (1.99% at December 31, 2014) 90-day LIBOR plus 1.75% (1.99% at December 31, 2014)
Interest rate, margin to be added 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtTwoMember		 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtTwoMember
90-day LIBOR interest rate at period end 1.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtTwoMember		 1.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtTwoMember
Maturity period of Federal Home Loan Bank advances 2016-09 2016-09