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Consolidated Statements of Condition (Parenthetical) (USD $)
In Thousands, except Share data
Jun. 30, 2011
Dec. 31, 2010
Consolidated Statements of Condition    
Held-to-maturity, Market value (in dollars) $ 2,450 $ 2,450
Available-for-sale, Amortized cost (in dollars) 4,933,681 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 6,712 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 95,717,948 95,711,285
Accumulated other comprehensive income, comprehensive loss related to other-than-temporary impairment for non-credit related issues (in dollars) $ (7,285) $ (6,870)
Treasury, shares 28,195,342 28,016,059