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In page Mechanics Bank:

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The beginnings of the bank were in 1905 when E.M. Downer began offering financial services to his acquaintances from a floor safe in his office.[1] This was a great convenience to the residents because the closest bank at the time was at the Contra Costa County seat at Martinez, 13 miles (21 km) away.[1] In 1915 he became second vice president and later, in 1919 after purchasing a controlling interest, he became president until his death in 1938.[1] He was succeeded by his son E.M. Downer, Jr. in 1939 who served as president until 1978.[2]