SAO PAULO, Feb 10 (Reuters) - Brazil’s bank lending is expected to grow 7.3% in 2021 but loan quality is likely to deteriorate, a survey by the country’s banking lobby association Febraban showed on Wednesday. The expected loan growth rate is slightly up from a December survey, when banks expected Brazil’s loan book to climb 7% in 2021. Banks said the 90-day loan default ratio should be 3.7%, an improvement on their December estimate of 4% but a rise from 2020 when it reached 2.9%.