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Non-Covered Loans and Leases (Narrative) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Receivables [Abstract]
Total loans pledged to secure borrowings	$ 5,500,000,000
Non-covered loans acquired with deteriorated credit quality	$ 24,500,000	$ 19,300,000

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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