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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income, Net of Taxes
--- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 180,887 us-gaap_StockholdersEquity | $ 80,095 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 101,464 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (672)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance (in shares) at Dec. 31, 2013 |  | 5,877,524 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 19,771 us-gaap_NetIncomeLoss |  | 19,771 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | 1,760 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  | 1,760 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Stock options exercised (in shares) |  | 49,415 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options exercised | 1,452 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 1,452 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Excess tax benefit - stock-based compensation | 172 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 172 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued under employee stock purchase plan (in shares) |  | 521 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued under employee stock purchase plan | 23 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 23 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Restricted stock granted (in shares) |  | 8,523 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Restricted stock granted | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Restricted stock forfeited/cancelled (in shares) |  | (2,067)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Restricted stock forfeited/cancelled | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock-based compensation - stock options | 200 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition | 200 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock-based compensation - restricted stock | 246 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition | 246 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends paid on common stock | (4,733)us-gaap_DividendsCommonStockCash |  | (4,733)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock purchased by directors under director stock plan (in shares) |  | 260 bmrc_StockIssuedDuringPeriodSharesNonemployeeDirectorStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock purchased by directors under director stock plan | 12 bmrc_StockIssuedDuringPeriodValueNonemployeeDirectorStockPurchasePlans | 12 bmrc_StockIssuedDuringPeriodValueNonemployeeDirectorStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued in payment of director fees (in shares) |  | 5,306 bmrc_StockIssuedInPaymentOfDirectorFeesShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued in payment of director fees | 236 bmrc_StockIssuedInPaymentOfDirectorFees | 236 bmrc_StockIssuedInPaymentOfDirectorFees / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Balance at Dec. 31, 2014 | 200,026 us-gaap_StockholdersEquity | 82,436 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 116,502 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,088 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance (in shares) at Dec. 31, 2014 | 5,939,482 us-gaap_CommonStockSharesOutstanding | 5,939,482 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 4,457 us-gaap_NetIncomeLoss |  | 4,457 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | 755 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  | 755 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Stock options exercised (in shares) |  | 9,371 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options exercised | 312 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 312 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Excess tax benefit - stock-based compensation | 28 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 28 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued under employee stock purchase plan (in shares) |  | 96 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued under employee stock purchase plan | 5 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 5 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Restricted stock granted (in shares) |  | 15,970 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Restricted stock granted | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock-based compensation - stock options | 36 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition | 36 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock-based compensation - restricted stock | 56 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition | 56 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends paid on common stock | (1,307)us-gaap_DividendsCommonStockCash |  | (1,307)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock issued in payment of director fees (in shares) |  | 2,695 bmrc_StockIssuedInPaymentOfDirectorFeesShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issued in payment of director fees | 138 bmrc_StockIssuedInPaymentOfDirectorFees | 138 bmrc_StockIssuedInPaymentOfDirectorFees / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Balance at Mar. 31, 2015 | $ 204,506 us-gaap_StockholdersEquity | $ 83,011 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 119,652 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,843 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance (in shares) at Mar. 31, 2015 | 5,967,614 us-gaap_CommonStockSharesOutstanding | 5,967,614 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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