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Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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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)

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