XML 67 R57.htm IDEA: XBRL DOCUMENT
v3.25.2

Stockholders' Equity - Schedule of Cashless Exercise Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Equity [Abstract] |  |
Number of shares withheld (in shares) | 4,325 | 3,504
Total amount withheld (in thousands) | $ 103 | $ 58
Weighted-average price (usd per share) | $ 23.93 | $ 16.59

X
- Definition Adjustments Related To Tax Withholding And Exercise Of Options For Share-Based Compensation + References No definition available. + Details
Name: | bmrc_AdjustmentsRelatedToTaxWithholdingAndExerciseOfOptionsForShareBasedCompensation
Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Tax Withholding And Exercises in Period, Weighted Average Exercise Price + References No definition available. + Details
Name: | bmrc_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsTaxWithholdingAndExercisesinPeriodWeightedAverageExercisePrice
Namespace Prefix: | bmrc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration