    <SEC-DOCUMENT>0001104659-21-083595-index.html : 20210621
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    <ACCEPTANCE-DATETIME>20210621172113
    ACCESSION NUMBER:		0001104659-21-083595
    CONFORMED SUBMISSION TYPE:	S-4/A
    PUBLIC DOCUMENT COUNT:		16
    FILED AS OF DATE:		20210621
    DATE AS OF CHANGE:		20210621

    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:		S-4/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-257025
    		FILM NUMBER:		211031966

    	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>
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    <SEQUENCE>1
    <FILENAME>tm2117826-3_s4a.htm
    <DESCRIPTION>S-4/A
    <TEXT>
    Document 1 - file: tm2117826-3_s4a.htm

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    <TYPE>EX-23.01
    <SEQUENCE>2
    <FILENAME>tm2117826d4_ex23-01.htm
    <DESCRIPTION>EXHIBIT 23.01
    <TEXT>
    Document 2 - file: tm2117826d4_ex23-01.htm

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    <DOCUMENT>
    <TYPE>EX-23.02
    <SEQUENCE>3
    <FILENAME>tm2117826d4_ex23-02.htm
    <DESCRIPTION>EXHIBIT 23.02
    <TEXT>
    Document 3 - file: tm2117826d4_ex23-02.htm

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    <DOCUMENT>
    <TYPE>EX-99.01
    <SEQUENCE>4
    <FILENAME>tm2117826d4_ex99-01.htm
    <DESCRIPTION>EXHIBIT 99.01
    <TEXT>
    Document 4 - file: tm2117826d4_ex99-01.htm

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    <TYPE>EX-99.02
    <SEQUENCE>5
    <FILENAME>tm2117826d4_ex99-02.htm
    <DESCRIPTION>EXHIBIT 99.02
    <TEXT>
    Document 5 - file: tm2117826d4_ex99-02.htm

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    <DESCRIPTION>GRAPHIC
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    <SEQUENCE>7
    <FILENAME>lg_bankofmarin-bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
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    <SEQUENCE>10
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    <SEQUENCE>12
    <FILENAME>tm2117826d1-hdr_pipersan4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: tm2117826d1-hdr_pipersan4c.jpg

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    <SEQUENCE>13
    <FILENAME>tm2117826d4_ex99-1img001.jpg
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    <TEXT>
    Document 13 - file: tm2117826d4_ex99-1img001.jpg

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    Document 14 - file: tm2117826d4_ex99-1img002.jpg

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    Document 15 - file: tm2117826d4_ex99-02img001.jpg

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