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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 432,788 | $ 5,340,271
Unrealized Losses, Less than 12 months | 1,431 | 24,777
Fair Value, 12 months or more | 291,021 | 280,126
Unrealized Losses, Greater than 12 months | 2,335 | 6,094
Fair Value, Total | 723,809 | 5,620,397
Unrealized Losses, Total | 3,766 | 30,871
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months |  | 1,539,637
Unrealized Losses, Less than 12 months |  | 1,118
Fair Value, 12 months or more |  | 0
Unrealized Losses, Greater than 12 months |  | 0
Fair Value, Total |  | 1,539,637
Unrealized Losses, Total | 0 | 1,118
Government Agency |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months |  | 229,436
Unrealized Losses, Less than 12 months |  | 374
Fair Value, 12 months or more |  | 0
Unrealized Losses, Greater than 12 months |  | 0
Fair Value, Total |  | 229,436
Unrealized Losses, Total | 0 | 374
Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 417,711 | 3,570,470
Unrealized Losses, Less than 12 months | 1,071 | 23,275
Fair Value, 12 months or more | 291,021 | 280,126
Unrealized Losses, Greater than 12 months | 2,335 | 6,094
Fair Value, Total | 708,732 | 3,850,596
Unrealized Losses, Total | 3,406 | 29,369
Equity Securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 13,037 | 728
Unrealized Losses, Less than 12 months | 285 | 10
Fair Value, 12 months or more | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Fair Value, Total | 13,037 | 728
Unrealized Losses, Total | 285 | 10
Other Debt Obligations |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 2,040 |
Unrealized Losses, Less than 12 months | 75 |
Fair Value, 12 months or more | 0 |
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 0 |
Fair Value, Total | 2,040 |
Unrealized Losses, Total | $ 75 | $ 0

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