ISTANBUL (Turkey), June 25 (SeeNews) – Fitch Ratings said it has downgraded the long-term foreign (FC) and local currency (LC) issuer default ratings (IDRs) of Turkiye Is Bankasi (Isbank), Turkiye Garanti Bankasi (Garanti) and Akbank to BBB- from BBB with stable outlooks on the long-term IDRs.