Home - Gesa Credit Union. Gesa Credit Union, the largest financial cooperative in Southeastern Washington, located in the Tri-Cities, Walla Walla and Wenatchee of Washington State. One of America''s Credit Unions (tm),where people are more valuable than money.(tm)" It''s not where you bank. It''s where you belong. (sm). Gesa, NCUA, credit, union, home, loans, interest, savings, seminar, planning, Richland, Kennewick, Pasco, Wenatchee, Tri-Cities, Walla Walla, secure, funded, Washington, refinance, rates, car, investing, loan, bank, kids, account, wealth, calculator, atm, finance, call-24, telephone, service, information, members, membership, web, book, mortgage, equity