XML 28 R124.htm IDEA: XBRL DOCUMENT v2.4.1.9
Preferred Stock - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended
Nov. 21, 2008
Dec. 31, 2014
Dec. 31, 2012
Aug. 22, 2012
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Partners Capital And Distributions [Line Items]              
Preferred shares sold 52,000us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued     0us-gaap_PreferredStockSharesIssued   28,000us-gaap_PreferredStockSharesIssued
Common stock purchased 679,443us-gaap_TreasuryStockSharesAcquired            
Proceeds from preferred stock and warrant $ 52,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants            
Fair value allocated to preferred stock 48,980,000abcb_FairValueAllocatedToPreferredSharesIssued            
Fair value allocated to warrant 3,020,000us-gaap_ProceedsFromIssuanceOfWarrants            
Cumulative dividends   5.00%us-gaap_PreferredStockDividendRatePercentage          
Cumulative dividends payment term   First five years          
Cumulative dividends   9.00%abcb_PreferredStockDividendRatePercentageAfterFiveYears          
Redeemed price of preferred stock   $ 1,000us-gaap_PreferredStockRedemptionPricePerShare     1,000us-gaap_PreferredStockRedemptionPricePerShare    
Repurchase of warrant     2,670,000us-gaap_PaymentsForRepurchaseOfWarrants        
Preferred stock outstanding   0us-gaap_PreferredStockSharesOutstanding     0us-gaap_PreferredStockSharesOutstanding   28,000us-gaap_PreferredStockSharesOutstanding
Warrant [Member]              
Partners Capital And Distributions [Line Items]              
Repurchase of warrant       $ 2,670,000us-gaap_PaymentsForRepurchaseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Preferred Stock [Member]              
Partners Capital And Distributions [Line Items]              
Repurchase of preferred stock         28,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
24,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember