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9. INTEREST-BEARING DEPOSITS - Interest-bearing deposits (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Interest-bearing Deposits $ 354,995us-gaap_InterestBearingDepositLiabilities $ 338,174us-gaap_InterestBearingDepositLiabilities
Savings [Member]    
Interest-bearing Deposits 58,820us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_SavingsDepositsMember		 51,733us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_SavingsDepositsMember
Money Market [Member]    
Interest-bearing Deposits 147,625us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_MoneyMarketDepositsMember		 135,169us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_MoneyMarketDepositsMember
NOW Accounts [Member]    
Interest-bearing Deposits 60,862us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_NOWAccountsDepositsMember		 59,042us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_NOWAccountsDepositsMember
Time, $100,000 or more [Member]    
Interest-bearing Deposits 65,569us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_TimeDepositsMember		 68,990us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_TimeDepositsMember
Other Time [Member]    
Interest-bearing Deposits $ 22,119us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_OtherTimeDepositsMember		 $ 23,240us-gaap_InterestBearingDepositLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= amrb_OtherTimeDepositsMember