 PORTLAND, Ore., Dec. 30, 2020 PRNewswire -- Umpqua Holdings Corporation NASDAQ: UMPQ, parent company of Umpqua Bank and Umpqua Investments, today announced that it will host its fourth quarter 2020 earnings conference call on Thursday, January 21st, 2021 at 10:00 a.m. PT 1:00 p.m... 