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SEC Filings

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constituted over 99% of our single-family conventional guaranty book of business as of both March 31, 2011 and December 31, 2010. We typically obtain this data from the sellers or servicers of the mortgage loans in our guaranty book of business and receive representations and warranties from them as to the accuracy of the information. While we perform various quality assurance checks by sampling loans to assess compliance with our underwriting and eligibility criteria, we do not independently verify all reported information. See “Risk Factors” in our 2010 Form 10-K for a discussion of the risk that we could experience mortgage fraud as a result of this reliance on lender representations.
Because we believe we have limited credit exposure on our government loans, the single-family credit statistics we focus on and report in the sections below generally relate to our single-family conventional guaranty book of business, which represents the substantial majority of our total single-family guaranty book of business.
We provide information on the performance of non-Fannie Mae mortgage-related securities held in our portfolio, including the impairment that we have recognized on these securities, in “Consolidated Balance Sheet Analysis—Investments in Mortgage-Related Securities—Investments in Private-Label Mortgage-Related Securities.”
Single-Family Acquisition and Servicing Policies and Underwriting and Servicing Standards
In evaluating our single-family mortgage credit risk, we closely monitor changes in housing and economic conditions and the impact of those changes on the credit risk profile of our single-family mortgage credit book of business. We regularly review and provide updates to our underwriting standards and eligibility guidelines that take into consideration changing market conditions.
For additional discussion of our acquisition policy, underwriting standards and use of mortgage insurance as a form of credit enhancement see “MD&A—Risk Management—Credit Risk Management—Single-Family Mortgage Credit Risk Management” in our 2010 Form 10-K. For a discussion of our aggregate mortgage insurance coverage as of March 31, 2011 and December 31, 2010, see “Risk Management—Credit Risk Management—Institutional Counterparty Credit Risk Management—Mortgage Insurers.”
Single-Family Portfolio Diversification and Monitoring
Diversification within our single-family mortgage credit book of business by product type, loan characteristics and geography is an important factor that influences credit quality and performance and may reduce our credit risk. We monitor various loan attributes, in conjunction with housing market and economic conditions, to determine if our pricing and our eligibility and underwriting criteria accurately reflect the risk associated with loans we acquire or guarantee. In some cases we may decide to significantly reduce our participation in riskier loan product categories. We also review the payment performance of loans in order to help identify potential problem loans early in the delinquency cycle and to guide the development of our loss mitigation strategies.