 NEW ORLEANS--BUSINESS WIRE--Former Attorney General of Louisiana Charles C. Foti, Jr., Esq. and the law firm of Kahn Swick Foti, LLC KSF are investigating the proposed sale of Umpqua Holdings Corporation NasdaqGS: UMPQ to Columbia Banking System, Inc. Nasdaq: COLB. Under the terms of the proposed transaction, shareholders of Umpqua will receive only 0.5958 of a share of Columbia stock for each share of Umpqua that they own. KSF is seeking to determine whether this consideration 