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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 1,962,911 | $ 1,173,274
Unrealized Losses, Less than 12 months | 13,121 | 2,203
Fair Value, 12 months or more | 296,170 | 832,420
Unrealized Losses, Greater than 12 months | 4,783 | 10,043
Fair Value, Total | 2,259,081 | 2,005,694
Unrealized Losses, Total | 17,904 | 12,246
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months |  | 338,612
Unrealized Losses, Less than 12 months |  | 151
Fair Value, 12 months or more |  | 1,015
Unrealized Losses, Greater than 12 months |  | 1
Fair Value, Total |  | 339,627
Unrealized Losses, Total | 0 | 152
Government Agency |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 90,567 | 261,288
Unrealized Losses, Less than 12 months | 385 | 247
Fair Value, 12 months or more | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Fair Value, Total | 90,567 | 261,288
Unrealized Losses, Total | 385 | 247
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 1,872,344 | 573,374
Unrealized Losses, Less than 12 months | 12,736 | 1,805
Fair Value, 12 months or more | 296,170 | 831,405
Unrealized Losses, Greater than 12 months | 4,783 | 10,042
Fair Value, Total | 2,168,514 | 1,404,779
Unrealized Losses, Total | $ 17,519 | 11,847
State, County and Municipal |  |
Investment securities available for sale: |  |
Unrealized Losses, Total |  | $ 0

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