Since 1890, Exchange Bank has served Sonoma County through trusted banking and financial services, focusing 100% of its chari ... table giving on the local community it serves. 50.44% of the Bank’s cash dividends goes to the Doyle Trust which funds the Doyle Scholarship at Santa Rosa Junior College. Since 1948, the Doyle Scholarship Fund has provided $90 million to over 135,000 students. read more