This is broadly known as Spokane Teachers Credit Union Bank was founded in 1934 in Spokane, Washington, and the bank is currently providing its services to the citizens of Washington state along with residents STCU Login of Kootenai and Bonner in Idaho. This is broadly known as Spokane Teachers Credit Union Bank was founded in 1934 in Spokane, Washington, and the bank is currently providing its services to the citizens of Washington state along with residents of Kootenai and Bonner in Idaho.