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Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Available for sale: |  |
Fair value, less than 12 months | $ 743,609 | $ 13,016
Unrealized losses, less than 12 months | (5,590) | (331)
Fair value, 12 months or more | 43,353 | 43,045
Unrealized losses, 12 months or more | (12,254) | (11,609)
Fair value, total | 786,962 | 56,061
Unrealized losses, total | (17,844) | (11,940)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 738,492 |
Unrealized losses, less than 12 months | (5,476) |
Fair value, 12 months or more | 32,860 | 39,605
Unrealized losses, 12 months or more | (10,557) | (10,680)
Fair value, total | 771,352 | 39,605
Unrealized losses, total | (16,033) | (10,680)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 5,117 | 9,531
Unrealized losses, less than 12 months | (114) | (315)
Fair value, 12 months or more | 10,437 | 3,398
Unrealized losses, 12 months or more | (1,677) | (896)
Fair value, total | 15,554 | 12,929
Unrealized losses, total | (1,791) | (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 | 56 | 42
Unrealized losses, 12 months or more | (20) | (33)
Fair value, total | 56 | 3,527
Unrealized losses, total | $ (20) | $ (49)

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