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Merger Agreement	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Merger Agreement	Merger Agreement On July 31, 2017, Bancorp entered into a definitive agreement to acquire Bank of Napa, N.A. ("Napa") whereby Napa will merge with and into Bank of Marin. The acquisition will enable Bank of Marin to expand its consumer and commercial business relationships, lending operations, and community presence in Napa County. Under the terms of the merger agreement, Napa shareholders will receive 0.307 of a share of Bancorp's common stock for each share of Napa's common stock upon consummation of the merger. Napa has two branch offices serving Napa County, and had assets of $255.3 million, total deposits of $226.1 million, and total loans of $140.5 million as of September 30, 2017. These amounts are subject to fair value adjustments upon the close of the merger. Subject to Napa shareholders' approval, the transaction is expected to close on November 20, 2017.

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- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-URI http://asc.fasb.org/topic&trid=2303972

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- References

No definition available.

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