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Cover
Jan. 25, 2024
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jan. 23, 2025
Entity File Number 001-33572
Entity Registrant Name Bank of Marin Bancorp
Entity Incorporation, State or Country Code CA
Entity Tax Identification Number 20-8859754
Entity Address, State or Province CA
Entity Address, City or Town Novato
Entity Address, Address Line Two Suite 100
Entity Address, Address Line One 504 Redwood Blvd.
Entity Address, Postal Zip Code 94947
City Area Code 415
Local Phone Number 763-4520
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, no par value and attached Share Purchase Rights
Trading Symbol BMRC
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001403475
Amendment Flag false
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2024