Numerica Credit Union Southridge branch. Numerica Credit Union is member-owned, not-for-profit financial institution. Numerica offers personal checking, savings, youth accounts, car loans, and mortgages all at great rates with lower fees. Membership is open to anyone who lives or works in Washington or Northern Idaho. Federally Insured by NCUA. Equal Housing Opportunity. Numerica's Southridge Branch features include drive-up and walk-up ATMs and coin counter.