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Benefit Plans - Defined Benefit Plan (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]    
Percentage of salary paid upon retirement 25.00%bmrc_DefinedBenefitPlanPercentageOfSalaryPaidUponRetirement  
Period before ratable vesting begins 5 years  
Age ratable vesting ends 65 years  
Liability under the Salary Continuation Plan $ 644us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet $ 493us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet