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Deposits - Schedule of Composition of Network Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Reciprocal |  |
CDARS | $ 46,162 | $ 11,031
ICS | 245,577 | 100,749
DDM | 132,276 | 62,219
Total network deposits | 424,015 | 173,999
One Way |  |
CDARS | 2,164 | 2,162
ICS | 0 | 0
DDM | 0 | 0
Total network deposits | $ 2,164 | $ 2,162

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- Definition Deposits Money Market Deposits Demand Deposit Marketplace + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Deposits Money Market Deposits Demand Deposit Marketplace One Way + References No definition available. + Details
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Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
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- Definition Deposits, Money Market Deposits, Insured Cash Sweep (ICS) + References No definition available. + Details
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Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
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- Definition Deposits Money Market Deposits Insured Cash Sweep ICS One Way + References No definition available. + Details
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Namespace Prefix: | bmrc_
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- Definition One Way [Abstract] + References No definition available. + Details
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- Definition Reciprocal [Abstract] + References No definition available. + Details
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- Definition Certificate of Deposit Account Registry Service, a special type of certificate of deposit whereby the participating bank accepts deposits in excess of the FDIC insured maximum and places the deposits through a network to member banks in the CDARS(R) network in increments of less than the FDIC insured maximum to provide the depositor full FDIC insurance coverage. + References No definition available. + Details
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Balance Type: | credit
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- Definition Time Deposits, Certificate Of Deposit Account Registry Service (CDARS), One-Way + References No definition available. + Details
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Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
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- Definition Total Network Deposits One Way + References No definition available. + Details
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Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
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- Definition Total Network Deposits Reciprocal + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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