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10. BORROWING ARRANGEMENTS (Details Narrative) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
BORROWING ARRANGEMENTS {2}    
Unsecured short-term borrowing arrangements with two of its correspondent banks $ 17,000amrb_UnsecuredShortTermBorrowingArrangementsWithTwoOfItsCorrespondentBanks $ 17,000amrb_UnsecuredShortTermBorrowingArrangementsWithTwoOfItsCorrespondentBanks
FHLB advances 11,000us-gaap_FederalHomeLoanBankAdvances 16,000us-gaap_FederalHomeLoanBankAdvances
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Range from 0.24%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeFrom 1.19%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeFrom
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Range to 1.91%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeTo 2.73%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeTo
Remaining amounts available under the borrowing arrangement with the FHLB 67,228us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds 56,230us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
Secured borrowing agreement with the Federal Reserve Bank of San Francisco $ 17,335us-gaap_SecuredDebt $ 21,358us-gaap_SecuredDebt