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Loans And Leases (Narrative) (Details) (USD $)	12 Months Ended
Loans And Leases (Narrative) (Details) (USD $)	Dec. 31, 2011 days	Dec. 31, 2010 days
Aggregate short-duration advances	2,170,000,000	2,630,000,000
Aggregate of debt restructurings	199,000,000	307,000,000
Non-accrual status principal interest payments past due days	60
Other real estate owned	79,000,000
Property Development Acquired-Credit Impaired [Member]
Other real estate owned	42,000,000
Troubled Debt Restructuring [Member]
Aggregate of debt restructurings
Commercial Real Estate [Member]
Loans or leases contractually past-due days	90	90
Institutional [Member]
Loans or leases contractually past-due days	90	90

Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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