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Merger Agreement
 3 Months Ended
Mar. 31, 2021
Subsequent Events [Abstract]  
Merger Agreement Merger AgreementOn April 16, 2021, Bancorp entered into a definitive agreement to acquire American River Bankshares ("AMRB"), parent company of American River Bank ("ARB"), whereby AMRB will merge with and into Bancorp and immediately thereafter ARB will merge with and into Bank of Marin (collectively, the "Merger"). The acquisition will expand Bank of Marin's presence throughout the Greater Sacramento, Amador and Sonoma County Regions where ARB has ten branches. Under the terms of the merger agreement, AMRB shareholders will receive a fixed exchange ratio of 0.575 shares of Bancorp's common stock for each share of AMRB's common stock outstanding upon consummation of the Merger. AMRB had total assets of $916.1 million, total deposits of $788.6 million, and total loans of $475.4 million as of March 31, 2021. These amounts are subject to fair value adjustments upon the close of the Merger. The Merger is expected to be completed in the third quarter of 2021, subject to approval by shareholders of Bancorp and AMRB, receipt of required regulatory and other approvals and satisfaction of customary closing conditions.