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Consolidated Statements of Condition (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Consolidated Statements of Condition
Held-to-maturity, Market value (in dollars)	$ 2,575	$ 2,450
Available-for-sale, Amortized cost (in dollars)	4,840,723	5,041,847
Series A Cumulative perpetual preferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Series A Cumulative perpetual preferred shares, per share liquidation value (in dollars per share)	$ 1,000	$ 1,000
Series A Cumulative perpetual preferred shares, Authorized shares	25,000,000	25,000,000
Series A Cumulative perpetual preferred shares, issued shares	216,000	216,000
Series A Cumulative perpetual preferred shares, discount	6,088	7,932
Common shares, par value (in dollars per share)	$ 1.00	$ 1.00
Common shares, Authorized shares	275,000,000	275,000,000
Common shares, issued shares	95,719,559	95,711,285
Accumulated other comprehensive income, comprehensive loss related to other-than-temporary impairment for non-credit related issues (in dollars)	$ (7,198)	$ (6,870)
Treasury, shares	28,433,714	28,016,059

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- Definition

Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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