Regions Financial Corp.’s improving asset quality garnered improved long-term ratings from Moody’s Investors Service. Moody’s upgraded Regions’ (NYSE: RF) senior-debt ratings to Ba1 from Ba3, citing the Birmingham-based company’s declining net charge-offs and loan delinquencies, as well as its enhanced risk management infrastructure. Its subsidiary, Regions Bank, also received an upgrade from Moody’s. The investor service also said Regions’ reduced exposure to commercial real estate…