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Derivative Financial Instruments and Hedging Activities (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014	Jun. 30, 2011 derivative	Aug. 31, 2010 derivative
Derivatives, Fair Value [Line Items]
Lower threshold requiring collateral to be posted, liabilities	$ 100,000bmrc_ThresholdRequiringCollateralToBePostedLiabilityPositionDerivatives
Higher threshold requiring collateral to be posted, liabilities	250,000.00bmrc_ThresholdRequiringCollateralToBePostedDerivativesInLiabilityPosition
Fair value hedge
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness, derivatives	11,000us-gaap_DerivativeNetHedgeIneffectivenessGainLoss / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember		158,000us-gaap_DerivativeNetHedgeIneffectivenessGainLoss / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember
Designated as hedging instrument | Fair value hedge
Derivatives, Fair Value [Line Items]
Accrued interest on swaps	40,000bmrc_DerivativeAccruedInterestInterestRateSwaps / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember				41,000bmrc_DerivativeAccruedInterestInterestRateSwaps / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swap | Not Designated as Hedging Instrument | Fair value hedge | Forward swap
Derivatives, Fair Value [Line Items]
Number of derivative instruments						1us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	1us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Interest rate swap | Designated as hedging instrument | Fair value hedge
Derivatives, Fair Value [Line Items]
Number of derivative instruments qualifying for short-cut hedge treatment	1bmrc_NumberOfDerivativeInstrumentsQualifyingForShortCutHedgeTreatment / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Number of derivative instruments	8us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swap | Designated as hedging instrument | Fair value hedge | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Asset derivatives	0us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember				4,589,000us-gaap_DerivativeAssetNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swap | Designated as hedging instrument | Fair value hedge | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Liability derivatives	30,992,000us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember				26,899,000us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swap | Designated as hedging instrument | Fair value hedge | Forward swap
Derivatives, Fair Value [Line Items]
Number of derivative instruments						1us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	1us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Interest income | Fair value hedge
Derivatives, Fair Value [Line Items]
(Decrease) increase in value of designated interest rate swaps recognized in interest income	(546,000)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember		736,000us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember
Payment on interest rate swaps recorded in interest income	(235,000)bmrc_DerivativePaymentOnInterestRateDerivative / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember		(253,000)bmrc_DerivativePaymentOnInterestRateDerivative / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember
Increase (decrease) in value of hedged loans recognized in interest income	571,000us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember		(531,000)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember
Decrease in value of yield maintenance agreement recognized against interest income	(14,000)bmrc_DerivativeIncreaseDecreaseInValueOfYieldMaintenanceAgreement / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember		(47,000)bmrc_DerivativeIncreaseDecreaseInValueOfYieldMaintenanceAgreement / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember
Net loss on derivatives recognized against interest income	(224,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember	[1]	(95,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember	[1]
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Fair value hedge | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives	0us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember				61,000us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Fair value hedge | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Liability derivatives	$ 2,481,000us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember				$ 1,996,000us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
[1] Includes hedge ineffectiveness gain of $11 thousand and gain of $158 thousand for the quarters ended March 31, 2015 and March 31, 2014, respectively. Changes in value of swaps were included in the assessment of hedge effectiveness.

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- Details

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