OREANDA-NEWS. Fitch Ratings has downgraded First Bank of Nigeria Ltd's (FBN) and United Bank for Africa's (UBA) the Long-Term Foreign Currency Issuer Default Ratings (IDRs) to 'B' from 'B+'. The Outlooks are Stable. The agency has also downgraded the National Long-Term Rating of FBN Holdings Plc (FBNH), the parent holding company of FBN, to 'BBB+(nga)' from 'A(nga)'.