You’ll notice a new name on the Umpqua Bank branches in Ritzville, Coulee City, Medical Lake and Othello as they are now owned by Spokane Teachers Credit Union . The deal closed last Friday and Umpqua branch employees have accepted positions at STCU so staffing is not expected to change. STCU was founded in Spokane in 1934 and is the largest credit union based in Eastern Washington.