Quoting from Wikipedia:
"The Community Reinvestment Act of 1977 seeks to address discrimination in loans made to individuals and businesses from low and moderate-income neighborhoods.[7] The Act mandates that all banking institutions that receive FDIC insurance be evaluated by Federal banking agencies to determine if the bank offers credit (in a manner consistent with safe and sound operations) in all communities in which the bank takes deposits.[3] The law does not list specific criteria for evaluating the performance of financial institutions. Rather, it directs that the evaluation process should accommodate the situation and context of each individual institution. Federal regulations dictate agency conduct in evaluating a bank's compliance in five performance areas, comprising twelve assessment factors. This examination culminates in a rating and a written report that becomes part of the supervisory record for that bank.[8]
The law, however, emphasizes that an institution's CRA activities should be undertaken in a safe and sound manner, and does not require institutions to make high-risk loans that may bring losses to the institution.[3][4] An institution's CRA compliance record is taken into account by the banking regulatory agencies when the institution seeks to expand through merger, acquisition or branching. The law does not mandate any other penalties for non-compliance with the CRA.[6][9]"
To further simplify this:
Banks are required to offer credit to ALL communities in which the bank accepts deposits. This means that a bank cannot open a branch in a poor neighborhood for the purposes of receiving deposits and then refuse to offer loans to those depositors.
This lending must occur "in a manner consistent with safe and sound operations." This means that banks are not required to lend in such a way that would lose them money or jeopardize their operations.
Last part: a bank's compliance with the CRA is only taken into account during mergers or expansion projects. THERE ARE NO OTHER PENALTIES FOR NONCOMPLIANCE.
Basically, the people who blame this recession on ACORN and poor people are saying that banks wanted to hew SO CLOSELY to a law that had no real consequences that they were forced to give all their money to poor people and bankrupt themselves. Maybe this explains why there are no more rich bankers or poor people in the US!