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Summary of Borrowed Funds (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Outstanding [Line Items]
FHLB advances	$ 9,314,193	$ 8,375,659
Repurchase agreements	4,125,000	4,125,000
Junior subordinated debentures	426,936	426,992
Senior notes	89,984	601,865
Preferred stock of subsidiaries	4,300	6,600
Total borrowed funds	$ 13,960,413	$ 13,536,116

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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