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6. LOANS AND LEASES - Outstanding loans and leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans and Leases Receivable $ 263,645us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 257,406us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 258,129us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Deferred loan and lease origination fees, net (287)us-gaap_LoansAndLeasesReceivableDeferredIncome (313)us-gaap_LoansAndLeasesReceivableDeferredIncome  
Allowance for loan and lease losses (5,301)us-gaap_LoansAndLeasesReceivableAllowance (5,346)us-gaap_LoansAndLeasesReceivableAllowance  
Outstanding loans and leases 258,057us-gaap_LoansAndLeasesReceivableNetReportedAmount 251,747us-gaap_LoansAndLeasesReceivableNetReportedAmount  
Real estate-commercial      
Loans and Leases Receivable 193,871us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
184,204us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
180,126us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Real estate-construction      
Loans and Leases Receivable 8,028us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_RealEstateConstructionMember
9,633us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_RealEstateConstructionMember
6,918us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_RealEstateConstructionMember
Real estate-multi-family      
Loans and Leases Receivable 14,167us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_RealEstateMultiFamilyMember
11,085us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_RealEstateMultiFamilyMember
9,155us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_RealEstateMultiFamilyMember
Real Estate Residential      
Loans and Leases Receivable 13,309us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalResidentialRealEstateMember
17,703us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalResidentialRealEstateMember
17,701us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalResidentialRealEstateMember
Commercial      
Loans and Leases Receivable 25,186us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalCommercialMember
24,545us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalCommercialMember
30,811us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalCommercialMember
Lease financing receivable      
Loans and Leases Receivable 1,286us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_LeaseFinancingReceivableMember
1,344us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_LeaseFinancingReceivableMember
 
Agriculture      
Loans and Leases Receivable 2,882us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_AgricultureMember
3,120us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_AgricultureMember
3,340us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_AgricultureMember
Consumer      
Loans and Leases Receivable $ 4,916us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalConsumerMember
$ 5,772us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalConsumerMember
$ 8,569us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= amrb_TotalConsumerMember