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Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Available for sale: |  |
Fair value, less than 12 months | $ 2,157,150 | $ 743,609
Unrealized losses, less than 12 months | (16,201) | (5,590)
Fair value, 12 months or more | 41,012 | 43,353
Unrealized losses, 12 months or more | (13,125) | (12,254)
Fair value, total | 2,198,162 | 786,962
Unrealized losses, total | (29,326) | (17,844)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 2,140,381 | 738,492
Unrealized losses, less than 12 months | (15,738) | (5,476)
Fair value, 12 months or more | 30,697 | 32,860
Unrealized losses, 12 months or more | (11,215) | (10,557)
Fair value, total | 2,171,078 | 771,352
Unrealized losses, total | (26,953) | (16,033)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 12,539 | 5,117
Unrealized losses, less than 12 months | (442) | (114)
Fair value, 12 months or more | 10,250 | 10,437
Unrealized losses, 12 months or more | (1,900) | (1,677)
Fair value, total | 22,789 | 15,554
Unrealized losses, total | (2,342) | (1,791)
Other equity securities |  |
Available for sale: |  |
Fair value, less than 12 months | 4,230 |
Unrealized losses, less than 12 months | (21) |
Fair value, 12 months or more | 65 |
Unrealized losses, 12 months or more | (10) |
Fair value, total | 4,295 |
Unrealized losses, total | (31) |
Equity Securities |  |
Available for sale: |  |
Fair value, 12 months or more |  | 56
Unrealized losses, 12 months or more |  | (20)
Fair value, total |  | 56
Unrealized losses, total |  | $ (20)

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