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Investment Securities (Details 3) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Available for sale: |  |
Fair value, less than 12 months | $ 730,912 | $ 816,979
Unrealized losses, less than 12 Months | (5,409) | (5,008)
Fair value, 12 months or more | 1,587,053 | 1,872,077
Unrealized losses, 12 Months or More | (42,095) | (45,973)
Fair value, total | 2,317,965 | 2,689,056
Unrealized losses, total | (47,504) | (50,981)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 705,681 | 808,072
Unrealized losses, less than 12 Months | (5,033) | (4,910)
Fair value, 12 months or more | 1,556,390 | 1,836,218
Unrealized losses, 12 Months or More | (35,769) | (40,268)
Fair value, total | 2,262,071 | 2,644,290
Unrealized losses, total | (40,802) | (45,178)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 20,252 | 8,833
Unrealized losses, less than 12 Months | (355) | (97)
Fair value, 12 months or more | 25,113 | 27,793
Unrealized losses, 12 Months or More | (6,126) | (5,521)
Fair value, total | 45,365 | 36,626
Unrealized losses, total | (6,481) | (5,618)
Other |  |
Available for sale: |  |
Fair value, less than 12 months | 4,979 | 74
Unrealized losses, less than 12 Months | (21) | (1)
Fair value, 12 months or more | 5,550 | 8,066
Unrealized losses, 12 Months or More | (200) | (184)
Fair value, total | 10,529 | 8,140
Unrealized losses, total | $ (221) | $ (185)

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