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Other Borrowings - Summary of Other Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Total other borrowings $ 78,881us-gaap_OtherBorrowings $ 194,572us-gaap_OtherBorrowings
Daily Rate Credit From Federal Home Loan Bank [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Advance from Federal Home Loan Bank with a fixed interest rate of 0.17%, due January 24, 2014. 35,000abcb_DebtInstrumentAdvance
/ 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]    
Advance from Federal Home Loan Bank with a fixed interest rate of 0.17%, due January 24, 2014.   165,000abcb_DebtInstrumentAdvance
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Revolving Credit Facility 1 [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Advance from Federal Home Loan Bank with a fixed interest rate of 0.17%, due January 24, 2014. 24,000abcb_DebtInstrumentAdvance
/ us-gaap_DebtInstrumentAxis
= abcb_RevolvingCreditFacilityOneMember		  
Revolving Credit Facility [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Advance from Federal Home Loan Bank with a fixed interest rate of 0.17%, due January 24, 2014.   10,000abcb_DebtInstrumentAdvance
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
Correspondent Bank Advances [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Advance from correspondent bank with a fixed interest rate of 4.50%, due November 27, 2017, secured by subsidiary bank loan receivable. 4,881abcb_AdvancesFromCorrespondentBank
/ us-gaap_DebtInstrumentAxis
= abcb_CorrespondentBankAdvancesMember		  
Subordinated Debt One [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Subordinated debt issued by Prosperity Bank due June 2016 with an interest rate of 90-day LIBOR plus 1.60% (1.84% at December 31, 2013).   5,000abcb_SubordinatedDebtIssued
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtOneMember
Subordinated Debt Two [Member]    
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]    
Subordinated debt issued by Prosperity Bank due June 2016 with an interest rate of 90-day LIBOR plus 1.60% (1.84% at December 31, 2013). $ 15,000abcb_SubordinatedDebtIssued
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtTwoMember		 $ 14,572abcb_SubordinatedDebtIssued
/ us-gaap_DebtInstrumentAxis
= abcb_SubordinatedDebtTwoMember