The ratings agency gave a BBB- rating to Corpbanca Colombia's viability rating, as well as its long-term local and foreign currency issuer default ratings (IDR).
While the plight of Estraval was a disaster of its own making, the rating agency cautions that lax regulation of non-bank financial institutions could give rise to more problems.
The downgrades for Bogotá and Medellín — Colombia's two biggest cities — are the same action Fitch Ratings took against the nation's sovereign rating and state-controlled Ecopetrol in July.
While Ecopetrol's long-term foreign-currency IDR was maintained at BBB, its outlook has changed to negative, and the energy giant's long-term local-currency IDR was downgraded one notch.
Though Bancolombia's recapitalization plan may yield dividends, "Fitch does not expect capitalization to return to levels reported in 2014 during this period."