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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 5,727,435 | $ 5,257,891
Unrealized Losses, Less than 12 months | 51,080 | 83,342
Fair Value, 12 months or more | 339,826 | 362,351
Unrealized Losses, Greater than 12 months | 4,491 | 4,689
Fair Value, Total | 6,067,261 | 5,620,242
Unrealized Losses, Total | 55,571 | 88,031
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 1,616,134 | 807,822
Unrealized Losses, Less than 12 months | 3,091 | 935
Fair Value, 12 months or more | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Fair Value, Total | 1,616,134 | 807,822
Unrealized Losses, Total | 3,091 | 935
Government Agency |  |
Investment securities available for sale: |  |
Unrealized Losses, Total | 0 | 0
Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 4,101,002 | 4,442,700
Unrealized Losses, Less than 12 months | 47,735 | 82,161
Fair Value, 12 months or more | 339,826 | 362,351
Unrealized Losses, Greater than 12 months | 4,491 | 4,689
Fair Value, Total | 4,440,828 | 4,805,051
Unrealized Losses, Total | 52,226 | 86,850
Equity Securities |  |
Investment securities available for sale: |  |
Unrealized Losses, Total | 0 | 0
Corporate Bonds |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 5,000 |
Unrealized Losses, Less than 12 months | 38 |
Fair Value, 12 months or more | 0 |
Unrealized Losses, Greater than 12 months | 0 |
Fair Value, Total | 5,000 |
Unrealized Losses, Total | 38 | 0
Other Debt Obligations |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 5,299 | 7,369
Unrealized Losses, Less than 12 months | 216 | 246
Fair Value, 12 months or more | 0 | 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 0 |
Unrealized Losses, Greater than 12 months |  | 0
Fair Value, Total | 5,299 | 7,369
Unrealized Losses, Total | $ 216 | $ 246

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