The account of the S&L crises published by the FDIC in 2000 lists multiple causes including:
“rising monetary inflation beginning in the late 1960s spurred by simultaneous domestic spending programs of President Lyndon B. Johnson’s “Great Society” programs coupled with the military expenses of the continuing Vietnam War that continued into the late 1970s.
The efforts to end rampant inflation of the late 1970s and early 1980s by raising interest rates brought on recession in the early 1980s and the beginning of the S&L crisis. Deregulation of the S&L industry, combined with regulatory forbearance, and fraud worsened the crisis.”
That would be the Depository Institutions Deregulation and Monetary Control Act signed by President Jimmy Carter on March 31, 1980, but you blame Reagan?