Regulators, on Friday, shut down banks in Florida, Arizona and Kansas, bringing to 133 the number of US banks that have failed to hold up this year against the struggling economy and a cascade of loan defaults. The Federal Deposit Insurance Corp took over Republic Federal Bank, with $433 million in assets and $352.7 million in deposits. A bank based in Boca Raton, Fla., 1st United Bank, agreed to assume all the deposits and $267.1 million of the assets of the failed bank.