That is 100% FALSE. This is the result of over-regulation.
Look up the Community Re-investment Act. It's a federal law that FORCES lenders to operate in areas that they have previously avoided as poor/risky. (Oh look, the government was wrong and the businesses were right). With Clinton strengthening it in 1994 the lenders were in a "lend-or-be-sued" situation. As a result all these lenders began packaging these loans and selling them because they sure as hell didn't want a huge pile of risky debt. This blame for this situation falls directly on the government. They are the ones that forced a huge amount of toxic debt to be created.
Its certainly not 100% false, AIG was regulated by the Office of Thrift Supervision for chrisssakes. The Community Re-investment Act is just a fox talking point. The reality of the situation was that banks took on toxic debts (some regulated, yes), however then they were able to chop this debt up, trade it, sell it, move it, slice it and dice it - until no-one had any idea exactly who owed what where. The whole house of cards grew, grew and eventually collapsed under its own weight. A bank dosen't intentionally acquire tens of billions of dollars of debt without knowing about it.
Also - from the CRA wikipedia page
"During a 2008 House Committee on Oversight and Government Reform hearing on the role of Fannie Mae and Freddie Mac in the financial crisis, including in relation to the Community Reinvestment Act, asked if the CRA provided the fuel for increasing subprime loans, former Fannie Mae CEO Franklin Raines said it might have been a catalyst encouraging bad behavior, but it was difficult to know. Raines also cited information that only a small percentage of risky loans originated as a result of the CRA."
It dosen't take a genius to go look at house prices in California in 2007 and to see they were unsustainable.