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The unrealized losses associated with U.S. Treasury securities and agency debentures, mortgage-backed securities, certain foreign sovereign securities, other taxable securities and tax-exempt securities are not considered to be other-than-temporary because their unrealized losses are related to changes in interest rates and do not affect the expected cash flows of the underlying collateral or issuer. The Corporation also has unrealized losses associated with other foreign sovereign securities; however, these losses are not considered other-than- temporary because the principal of these securities is guaranteed by the U.S. government.
Excluding securities issued by the U.S. government and its agencies and corporations (including the Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage Corporation (Freddie Mac)), there were no investments in securities from one issuer that exceeded 10 percent of consolidated shareholders' equity at December 31, 2003 or 2002.
Securities are pledged or assigned to secure borrowed funds, government and trust deposits and for other purposes. The carrying value of pledged securities was $20.9 billion and $32.9 billion at December 31, 2003 and 2002, respectively.
The expected maturity distribution and yields of the Corporation's securities portfolio at December 31, 2003 are summarized below. Actual maturities may differ from the contractual or expected maturities shown in the following table since borrowers may have the right to prepay obligations with or without prepayment penalties.
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