Press release content from Globe Newswire. The AP news staff was not involved in its creation. Bank of Marin Bancorp and American River Bankshares Announce The Signing of a Merger Agreement American River BanksharesApril 19, 2021 GMT NOVATO, Calif. and SACRAMENTO, Calif., April 19, 2021 (GLOBE NEWSWIRE) -- Bank of Marin Bancorp, “BMRC” (Nasdaq: BMRC), parent company of Bank of Marin, “the Bank,” and American River Bankshares “AMRB” (Nasdaq: AMRB), parent company of American River Bank, today announced the signing of a merger agreement. American River Bankshares has ten branches ac...