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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2011 investor | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 05, 2008
Class of Stock [Line Items] |  |  |  |  |
Number of institutional investors that purchased warrant | 2 bmrc_NumberOfInstitutionalInvestorsThatPurchasedWarrant |  |  |  |
Cash dividends to common stockholders |  | $ 1,307 us-gaap_DividendsCommonStockCash | $ 1,120 us-gaap_DividendsCommonStockCash | $ 4,733 us-gaap_DividendsCommonStockCash |
Cash dividends paid per common share |  | $ 0.22 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.19 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Performance Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting period of performance-based stock awards |  | 3 years |  |  |
Performance Shares [Member] | Minimum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage of performance-based awards |  | 0.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage of performance-based awards |  | 200.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of common stock shares authorized to be purchased by warrant |  | 157,198 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
Exercise price of warrant to purchase common stock (usd per share) |  | $ 26.72 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
U.S. Treasury Capital Purchase Program (TCPP) | Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of common stock shares authorized to be purchased by warrant |  |  |  |  | 154,242 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ShareRepurchaseProgramAxis = bmrc_USTreasuryCapitalPurchaseProgramTcppMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Exercise price of warrant to purchase common stock (usd per share) |  |  |  |  | $ 27.23 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ShareRepurchaseProgramAxis = bmrc_USTreasuryCapitalPurchaseProgramTcppMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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