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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Available for sale:    
Fair value, less than 12 months $ 13,016 $ 1,269,409
Unrealized losses, less than 12 months (331) (23,870)
Fair value, 12 months or more 43,045 46,446
Unrealized losses, 12 months or more (11,609) (10,761)
Fair value, total 56,061 1,315,855
Unrealized losses, total (11,940) (34,631)
Residential mortgage-backed securities
    
Available for sale:    
Fair value, less than 12 months   1,166,720
Unrealized losses, less than 12 months   (19,192)
Fair value, 12 months or more 39,605 46,028
Unrealized losses, 12 months or more (10,680) (10,654)
Fair value, total 39,605 1,212,748
Unrealized losses, total (10,680) (29,846)
Obligations of states and political subdivisions
    
Available for sale:    
Fair value, less than 12 months 9,531 97,701
Unrealized losses, less than 12 months (315) (4,666)
Fair value, 12 months or more 3,398 355
Unrealized losses, 12 months or more (896) (95)
Fair value, total 12,929 98,056
Unrealized losses, total (1,211) (4,761)
Equity Securities
    
Available for sale:    
Fair value, less than 12 months 3,485 4,988
Unrealized losses, less than 12 months (16) (12)
Fair value, 12 months or more 42 63
Unrealized losses, 12 months or more (33) (12)
Fair value, total 3,527 5,051
Unrealized losses, total $ (49) $ (24)