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Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Available for sale: |  |
Fair value, less than 12 months | $ 576,430 | $ 13,016
Unrealized losses, less than 12 months | (2,933) | (331)
Fair value, 12 months or more | 41,511 | 43,045
Unrealized losses, 12 months or more | (12,721) | (11,609)
Fair value, total | 617,941 | 56,061
Unrealized losses, total | (15,654) | (11,940)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 555,546 |
Unrealized losses, less than 12 months | (2,644) |
Fair value, 12 months or more | 35,877 | 39,605
Unrealized losses, 12 months or more | (11,621) | (10,680)
Fair value, total | 591,423 | 39,605
Unrealized losses, total | (14,265) | (10,680)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 20,884 | 9,531
Unrealized losses, less than 12 months | (289) | (315)
Fair value, 12 months or more | 5,584 | 3,398
Unrealized losses, 12 months or more | (1,075) | (896)
Fair value, total | 26,468 | 12,929
Unrealized losses, total | (1,364) | (1,211)
Equity Securities |  |
Available for sale: |  |
Fair value, less than 12 months |  | 3,485
Unrealized losses, less than 12 months |  | (16)
Fair value, 12 months or more |  | 42
Unrealized losses, 12 months or more |  | (33)
Fair value, total |  | 3,527
Unrealized losses, total |  | (49)
Other equity securities |  |
Available for sale: |  |
Fair value, 12 months or more | 50 |
Unrealized losses, 12 months or more | (25) |
Fair value, total | 50 |
Unrealized losses, total | $ (25) |

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