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Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Modifications, Recorded Investment, Removal From Troubled Debt Restructuring | $ 108,000 bmrc_FinancingReceivableModificationsRecordedInvestmentRemovalFromTroubledDebtRestructuring |  | $ 0 bmrc_FinancingReceivableModificationsRecordedInvestmentRemovalFromTroubledDebtRestructuring |
Recorded investment in Troubled Debt Restructurings | 22,317,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | [1] | 22,703,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | [1]
TDR loans accruing interest as of period end | 15,600,000 bmrc_FinancingReceivableModificationsAccruing |  | 15,900,000 bmrc_FinancingReceivableModificationsAccruing |
TDR loans acquired | 1,600,000 bmrc_TroubledDebtRestructuringLoansAcquired |  | 1,800,000 bmrc_TroubledDebtRestructuringLoansAcquired |
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | 3,477,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember | [1] | 3,584,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember | [1]
Commercial real estate, owner-occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | 8,427,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bmrc_CommercialRealEstateOwnerOccupiedFinancingReceivableMember | [1] | 8,459,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bmrc_CommercialRealEstateOwnerOccupiedFinancingReceivableMember | [1]
Commercial real estate, investor |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | 522,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bmrc_CommercialRealEstateInvestorFinancingReceivableMember | [1] | 524,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bmrc_CommercialRealEstateInvestorFinancingReceivableMember | [1]
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | 5,657,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember | [1] | 5,684,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember | [1]
Home equity |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | 561,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityLoanMember | [1] | 694,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityLoanMember | [1]
Other residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | 2,037,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bmrc_OtherResidentialFinancingReceivableMember | [1] | 2,045,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bmrc_OtherResidentialFinancingReceivableMember | [1]
Installment and other consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment in Troubled Debt Restructurings | $ 1,636,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | [1] | $ 1,713,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | [1]
[1] | Includes $15.6 million and $15.9 million of TDR loans that were accruing interest as of March 31, 2015 and December 31, 2014, respectively. Includes $1.6 million and $1.8 million of acquired loans at March 31, 2015 and December 31, 2014, respectively.

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