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Investment Securities (Details 3) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Available for sale: |  |
Fair value, less than 12 months | $ 286,236 | $ 816,979
Unrealized losses, less than 12 Months | (1,305) | (5,008)
Fair value, 12 months or more | 1,516,164 | 1,872,077
Unrealized losses, 12 Months or More | (27,006) | (45,973)
Fair value, total | 1,802,400 | 2,689,056
Unrealized losses, total | (28,311) | (50,981)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 276,858 | 808,072
Unrealized losses, less than 12 Months | (1,190) | (4,910)
Fair value, 12 months or more | 1,485,041 | 1,836,218
Unrealized losses, 12 Months or More | (20,884) | (40,268)
Fair value, total | 1,761,899 | 2,644,290
Unrealized losses, total | (22,074) | (45,178)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 9,306 | 8,833
Unrealized losses, less than 12 Months | (111) | (97)
Fair value, 12 months or more | 25,521 | 27,793
Unrealized losses, 12 Months or More | (5,974) | (5,521)
Fair value, total | 34,827 | 36,626
Unrealized losses, total | (6,085) | (5,618)
Other |  |
Available for sale: |  |
Fair value, less than 12 months | 72 | 74
Unrealized losses, less than 12 Months | (4) | (1)
Fair value, 12 months or more | 5,602 | 8,066
Unrealized losses, 12 Months or More | (148) | (184)
Fair value, total | 5,674 | 8,140
Unrealized losses, total | $ (152) | $ (185)

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