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Investments (Unrealized Losses) (Details) $ in Thousands | Dec. 31, 2017 USD ($) investments | Dec. 31, 2016 USD ($)
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 3,752,642 | $ 5,257,891
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 21,458 | 83,342
Aggregate fair value, continuous unrealized loss position, 12 months or more | 2,975,631 | 362,351
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 59,470 | 4,689
Total fair value | 6,728,273 | 5,620,242
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 80,928 | 88,031
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 1,408,166 | 807,822
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 345 | 935
Aggregate fair value, continuous unrealized loss position, 12 months or more | 249,698 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 201 | 0
Total fair value | 1,657,864 | 807,822
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 546 | 935
Investment securities held to maturity: |  |
Number of investments in continuous unrealized loss position for more than twelve months | investments | 4 |
Government Agency |  |
Investment securities available for sale: |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments |  | 0
Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 2,334,102 | 4,442,700
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 20,923 | 82,161
Aggregate fair value, continuous unrealized loss position, 12 months or more | 2,725,933 | 362,351
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 59,269 | 4,689
Total fair value | 5,060,035 | 4,805,051
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 80,192 | 86,850
Investment securities held to maturity: |  |
Number of investments in continuous unrealized loss position for more than twelve months | investments | 227 |
Equity Securities |  |
Investment securities available for sale: |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 0 | 0
Corporate Bonds |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 5,025 |
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 8 |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Total fair value | 5,025 |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 8 | 0
Other Debt Obligations |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 5,349 | 7,369
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 182 | 246
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total fair value | 5,349 | 7,369
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 182 | $ 246

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