Deposits - Scheduled Maturities of Brokered Deposits and Weighted Average Costs (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Deposits [Line Items]
Balance, 2013	$ 21,799
Balance, 2014	5,970
Balance, Total	$ 27,769
Average Cost, 2013	3.29%
Average Cost, 2014	3.00%
Average Cost	3.23%

Brokered Deposits Weighted Average Interest Rate Maturities Year One

No definition available.

Name:	abcb_BrokeredDepositsWeightedAverageInterestRateMaturitiesYearOne
Namespace Prefix:	abcb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant