1 EXHIBIT 17 STAN HORTON P.O. BOX 3384 SPOKANE, WA 99220 April 21, 1997 William Dashiell United Security Bancorporation 9506 N. Newport Highway Spokane, WA 99218-1200 Let this letter, effective immediately, tender may resignation from the Board of Directors of United Security Bankcorporation, and any and all subsidiaries. I no longer have faith in the internal controls management has in place nor the personnel in charge of these controls. I would appreciate 120 days to move and replace our accounts with another institution. If this is not acceptable, please let me know. Sincerely, /s/ STAN HORTON - ----------------------------- Stan Horton