Actually, one of the first steps in this direction was taken not by Roosevelt but by his predecessor, Herbert Hoover, who oversaw the creation of the Federal Home Loan Banking System in 1932. This measure reorganized the thrift industry (savings and loans and mutual savings banks) under federally chartered associations and established a credit reserve system modeled after the Federal Reserve.
The Roosevelt administration pushed this and other programs affecting housing finance much further. In 1934, his administration oversaw the creation of the Federal Housing Administration (FHA). By providing a federally backed insurance system for mortgage lenders, the FHA was designed to encourage lenders to offer mortgages on more attractive terms.