    <SEC-DOCUMENT>0001403475-23-000056-index.html : 20231103
    <SEC-HEADER>0001403475-23-000056.hdr.sgml : 20231103
    <ACCEPTANCE-DATETIME>20231103164901
    ACCESSION NUMBER:		0001403475-23-000056
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		43
    CONFORMED PERIOD OF REPORT:	20231103
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20231103
    DATE AS OF CHANGE:		20231103

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Bank of Marin Bancorp
    		CENTRAL INDEX KEY:			0001403475
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				208859754
    		STATE OF INCORPORATION:			CA
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33572
    		FILM NUMBER:		231377076

    	BUSINESS ADDRESS:
    		STREET 1:		504 REDWOOD BOULEVARD, SUITE 100
    		CITY:			NOVATO
    		STATE:			CA
    		ZIP:			94947
    		BUSINESS PHONE:		415-763-7781

    	MAIL ADDRESS:
    		STREET 1:		504 REDWOOD BOULEVARD, SUITE 100
    		CITY:			NOVATO
    		STATE:			CA
    		ZIP:			94947
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>bmrc-20231103.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: bmrc-20231103.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>a112023-kbwvirtualwestco.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: a112023-kbwvirtualwestco.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>bmrc-20231103.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: bmrc-20231103.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>bmrc-20231103_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: bmrc-20231103_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>bmrc-20231103_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: bmrc-20231103_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>a112023-kbwvirtualwestco001.jpg
    <TEXT>
    Document 6 - file: a112023-kbwvirtualwestco001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>a112023-kbwvirtualwestco002.jpg
    <TEXT>
    Document 7 - file: a112023-kbwvirtualwestco002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>a112023-kbwvirtualwestco003.jpg
    <TEXT>
    Document 8 - file: a112023-kbwvirtualwestco003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>a112023-kbwvirtualwestco004.jpg
    <TEXT>
    Document 9 - file: a112023-kbwvirtualwestco004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>a112023-kbwvirtualwestco005.jpg
    <TEXT>
    Document 10 - file: a112023-kbwvirtualwestco005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>a112023-kbwvirtualwestco006.jpg
    <TEXT>
    Document 11 - file: a112023-kbwvirtualwestco006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>a112023-kbwvirtualwestco007.jpg
    <TEXT>
    Document 12 - file: a112023-kbwvirtualwestco007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>a112023-kbwvirtualwestco008.jpg
    <TEXT>
    Document 13 - file: a112023-kbwvirtualwestco008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>a112023-kbwvirtualwestco009.jpg
    <TEXT>
    Document 14 - file: a112023-kbwvirtualwestco009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>a112023-kbwvirtualwestco010.jpg
    <TEXT>
    Document 15 - file: a112023-kbwvirtualwestco010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>a112023-kbwvirtualwestco011.jpg
    <TEXT>
    Document 16 - file: a112023-kbwvirtualwestco011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>a112023-kbwvirtualwestco012.jpg
    <TEXT>
    Document 17 - file: a112023-kbwvirtualwestco012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>a112023-kbwvirtualwestco013.jpg
    <TEXT>
    Document 18 - file: a112023-kbwvirtualwestco013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>a112023-kbwvirtualwestco014.jpg
    <TEXT>
    Document 19 - file: a112023-kbwvirtualwestco014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>a112023-kbwvirtualwestco015.jpg
    <TEXT>
    Document 20 - file: a112023-kbwvirtualwestco015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>a112023-kbwvirtualwestco016.jpg
    <TEXT>
    Document 21 - file: a112023-kbwvirtualwestco016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>a112023-kbwvirtualwestco017.jpg
    <TEXT>
    Document 22 - file: a112023-kbwvirtualwestco017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>a112023-kbwvirtualwestco018.jpg
    <TEXT>
    Document 23 - file: a112023-kbwvirtualwestco018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>a112023-kbwvirtualwestco019.jpg
    <TEXT>
    Document 24 - file: a112023-kbwvirtualwestco019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>a112023-kbwvirtualwestco020.jpg
    <TEXT>
    Document 25 - file: a112023-kbwvirtualwestco020.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>a112023-kbwvirtualwestco021.jpg
    <TEXT>
    Document 26 - file: a112023-kbwvirtualwestco021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>a112023-kbwvirtualwestco022.jpg
    <TEXT>
    Document 27 - file: a112023-kbwvirtualwestco022.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>a112023-kbwvirtualwestco023.jpg
    <TEXT>
    Document 28 - file: a112023-kbwvirtualwestco023.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>a112023-kbwvirtualwestco024.jpg
    <TEXT>
    Document 29 - file: a112023-kbwvirtualwestco024.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>a112023-kbwvirtualwestco025.jpg
    <TEXT>
    Document 30 - file: a112023-kbwvirtualwestco025.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>a112023-kbwvirtualwestco026.jpg
    <TEXT>
    Document 31 - file: a112023-kbwvirtualwestco026.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>a112023-kbwvirtualwestco027.jpg
    <TEXT>
    Document 32 - file: a112023-kbwvirtualwestco027.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>a112023-kbwvirtualwestco028.jpg
    <TEXT>
    Document 33 - file: a112023-kbwvirtualwestco028.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>a112023-kbwvirtualwestco029.jpg
    <TEXT>
    Document 34 - file: a112023-kbwvirtualwestco029.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>a112023-kbwvirtualwestco030.jpg
    <TEXT>
    Document 35 - file: a112023-kbwvirtualwestco030.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>36
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 36 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>37
    <FILENAME>bmrc-20231103_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 37 - file: bmrc-20231103_htm.html

    Document 37 - RAW XML: bmrc-20231103_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>38
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 38 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>39
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 39 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>40
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 40 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>41
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 41 - file: FilingSummary.html

    Document 41 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>43
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 43 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>44
    <FILENAME>0001403475-23-000056-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 44 - file: 0001403475-23-000056-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>