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Commitments and Contingencies (Details) (USD $)
0 Months Ended
Jan. 14, 2015
request
Mar. 31, 2015
Dec. 31, 2014
Operating Leases      
2015   $ 2,822,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016   3,788,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017   3,781,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2018   3,810,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2019   3,553,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears  
Thereafter   6,786,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter  
Total   24,540,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Visa Inc.      
Litigation Matters      
Number of requests by merchants rejoining class settlement 1,179bmrc_NumberOfRequestsByMerchantsRejoiningClassSettlement
/ dei_LegalEntityAxis
= bmrc_VisaIncMember
   
Loan commitments and standby letters of credit, unused      
Loss Contingencies [Line Items]      
Loan commitments and standby letters of credit, off-balance sheet   343,700,000bmrc_OffBalanceSheetArrangementsLiabilitiesCurrentExposure
/ us-gaap_FinancialInstrumentAxis
= bmrc_LinesOfCreditAndLettersOfCreditUnusedCommitmentsMember
 
Loan commitments and standby letters of credit, unused | Interest payable and other liabilities      
Loss Contingencies [Line Items]      
Allowance for off balance sheet commitments   811,000bmrc_AllowanceForOffBalanceSheetCommitments
/ us-gaap_BalanceSheetLocationAxis
= bmrc_InterestPayableAndOtherLiabilitiesMember
/ us-gaap_FinancialInstrumentAxis
= bmrc_LinesOfCreditAndLettersOfCreditUnusedCommitmentsMember
1,000,000bmrc_AllowanceForOffBalanceSheetCommitments
/ us-gaap_BalanceSheetLocationAxis
= bmrc_InterestPayableAndOtherLiabilitiesMember
/ us-gaap_FinancialInstrumentAxis
= bmrc_LinesOfCreditAndLettersOfCreditUnusedCommitmentsMember
Commercial lines of credit      
Loss Contingencies [Line Items]      
Loan commitments and standby letters of credit, off-balance sheet   177,200,000bmrc_OffBalanceSheetArrangementsLiabilitiesCurrentExposure
/ us-gaap_FinancialInstrumentAxis
= bmrc_CommercialLinesOfCreditMember
 
Revolving home equity lines      
Loss Contingencies [Line Items]      
Loan commitments and standby letters of credit, off-balance sheet   118,300,000bmrc_OffBalanceSheetArrangementsLiabilitiesCurrentExposure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
 
Undisbursed construction loans      
Loss Contingencies [Line Items]      
Loan commitments and standby letters of credit, off-balance sheet   34,500,000bmrc_OffBalanceSheetArrangementsLiabilitiesCurrentExposure
/ us-gaap_FinancialInstrumentAxis
= bmrc_UndisbursedConstructionLoansMember
 
Standby letters of credit      
Loss Contingencies [Line Items]      
Loan commitments and standby letters of credit, off-balance sheet   2,300,000bmrc_OffBalanceSheetArrangementsLiabilitiesCurrentExposure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
 
Personal and other lines of credit      
Loss Contingencies [Line Items]      
Loan commitments and standby letters of credit, off-balance sheet   $ 11,400,000bmrc_OffBalanceSheetArrangementsLiabilitiesCurrentExposure
/ us-gaap_FinancialInstrumentAxis
= bmrc_ConsumerAndOtherLinesOfCreditMember