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13. SHAREHOLDERS' EQUITY (Details Narrative) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 21, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 211,024us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 277,923us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 305,670us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 271,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 277,923us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 24,830us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 11,448us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award

Of the 24,830 restricted common shares, 13,560 will vest one year from the date of the award and 11,270 will vest 20% per year from the date of the award.

     
Weighted average contractual term over which the restricted stock will vest 1 year 2 months 19 days      
Common Stock, Shares Outstanding 8,089,615us-gaap_CommonStockSharesOutstanding 8,489,247us-gaap_CommonStockSharesOutstanding    
The 2012 Program [Member]        
Treasury Stock, Shares, Acquired     575,389us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= amrb_The2012ProgramMember
 
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)     7.29us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_PlanNameAxis
= amrb_The2012ProgramMember
 
The 2013 Program [Member]        
Treasury Stock, Shares, Acquired   849,404us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= amrb_The2013ProgramMember
   
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)   8.24us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_PlanNameAxis
= amrb_The2013ProgramMember
   
Stock Repurchase Program, Percentage of Outstanding Shares   10.00%amrb_StockRepurchaseProgramPercentageOfOutstandingShares
/ us-gaap_PlanNameAxis
= amrb_The2013ProgramMember
   
The 2014 Program [Member]        
Treasury Stock, Shares, Acquired 424,462us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= amrb_The2014ProgramMember
     
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) 9.77us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_PlanNameAxis
= amrb_The2014ProgramMember
     
Stock Repurchase Program, Percentage of Outstanding Shares 5.00%amrb_StockRepurchaseProgramPercentageOfOutstandingShares
/ us-gaap_PlanNameAxis
= amrb_The2014ProgramMember
     
The 2015 Program [Member]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 404,481us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_PlanNameAxis
= amrb_The2015ProgramMember
     
Common Stock, Shares Outstanding 8,089,615us-gaap_CommonStockSharesOutstanding
/ us-gaap_PlanNameAxis
= amrb_The2015ProgramMember
     
The 2015 Program [Member] | Subsequent Event [Member]        
Stock Repurchase Program, Percentage of Outstanding Shares       5.00%amrb_StockRepurchaseProgramPercentageOfOutstandingShares
/ us-gaap_PlanNameAxis
= amrb_The2015ProgramMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
2000 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 221,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= amrb_IncentivePlan2000Member
     
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,416,330us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= amrb_IncentivePlan2010Member