Umpqua Bank opened in 1953 so millworkers in Canyonville and Riddle could cash their paychecks at a bank rather than a bar or grocery store or have to drive several miles north to Myrtle Creek. Fifty-nine years after that modest beginning, the Roseburg-based bank is set to make its highest-profile inroad yet into a major market with the opening of a branch in San Francisco’s financial district. “The name of the game is growth,” Chief Executive Officer Ray Davis said this morning from his Portland office. “Puget Sound was big for us, as was Portland when we went there. This …