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Pledged Treasury Securities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2007
Pledged Treasury Securities [Line Items]
Mortgage debt defeased in connection to sale	$ 29.3

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for greater than one year or the normal operating cycle, whichever is longer and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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