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Fair Value of Assets and Liabilities - Recorded on Nonrecurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value $ 25,110us-gaap_ImpairedFinancingReceivableRecordedInvestment $ 25,223us-gaap_ImpairedFinancingReceivableRecordedInvestment
Specific valuation allowance for impaired loans 961us-gaap_ImpairedFinancingReceivableRelatedAllowance 1,138us-gaap_ImpairedFinancingReceivableRelatedAllowance
Discount rate for selling costs applied to all properties 6.00%us-gaap_FairValueInputsDiscountRate  
OREO acquired 421bmrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherRealEstateOwned 461bmrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherRealEstateOwned
Changed in estimated value of OREO 40bmrc_BusinessCombinationOtherRealEstateOwnedChangeinEstimatedFairValueasofAcquisitionDate  
Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Specific valuation allowance for impaired loans 10us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= bmrc_ImpairedLoansReceivableMember		 26us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
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Financial instruments at fair value measured on a nonrecurring basis | Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 13us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 77us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1]
Financial instruments at fair value measured on a nonrecurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Financial instruments at fair value measured on a nonrecurring basis | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Financial instruments at fair value measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 13us-gaap_ImpairedFinancingReceivableRecordedInvestment
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Installment and other consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 1,693us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 1,793us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Specific valuation allowance for impaired loans 188us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 284us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Installment and other consumer | Financial instruments at fair value measured on a nonrecurring basis | Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 13us-gaap_ImpairedFinancingReceivableRecordedInvestment
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Installment and other consumer | Financial instruments at fair value measured on a nonrecurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Installment and other consumer | Financial instruments at fair value measured on a nonrecurring basis | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Installment and other consumer | Financial instruments at fair value measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value, carrying value $ 13us-gaap_ImpairedFinancingReceivableRecordedInvestment
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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[1] Represents collateral-dependent loan principal balances that had been generally written down to the values of the underlying collateral, net of specific valuation allowances of $10 thousand and $26 thousand at March 31, 2015 and December 31, 2014, respectively. The carrying value of loans fully charged-off, which includes unsecured lines of credit, overdrafts and all other loans, is zero.