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Investments (Unrealized Losses) (Details) $ in Thousands | Dec. 31, 2018 USD ($) investments investment | Dec. 31, 2017 USD ($)
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 705,526 | $ 3,752,642
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 3,943 | 21,458
Aggregate fair value, continuous unrealized loss position, 12 months or more | 2,796,627 | 2,975,631
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 52,489 | 59,470
Total fair value | 3,502,153 | 6,728,273
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 56,432 | 80,928
Investment securities held to maturity: |  |
Number of investments in continuous unrealized loss position for more than twelve months | investment | 221 |
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 248,983 | 1,408,166
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 113 | 345
Aggregate fair value, continuous unrealized loss position, 12 months or more | 848,622 | 249,698
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,053 | 201
Total fair value | 1,097,605 | 1,657,864
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 2,166 | 546
Investment securities held to maturity: |  |
Number of investments in continuous unrealized loss position for more than twelve months | investments | 7 |
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 115,273 | 848
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 601 | 12
Aggregate fair value, continuous unrealized loss position, 12 months or more | 2,310 | 2,527
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 38 | 28
Total fair value | 117,583 | 3,375
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 639 | 40
Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 262,204 | 2,333,254
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 2,387 | 20,911
Aggregate fair value, continuous unrealized loss position, 12 months or more | 1,940,695 | 2,723,406
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 50,376 | 59,241
Total fair value | 2,202,899 | 5,056,660
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 52,763 | 80,152
Investment securities held to maturity: |  |
Less than 12 months, fair value | 5,111 |
Held-to-maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss | 181 |
12 months or more, fair value | 10,131 |
Held-to-maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss | 309 |
Total fair value | $ 15,242 |
Number of investments in continuous unrealized loss position for more than twelve months | investments | 213 |
Corporate Bonds |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 79,066 | 5,025
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 842 | 8
Aggregate fair value, continuous unrealized loss position, 12 months or more | 5,000 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 22 | 0
Total fair value | 84,066 | 5,025
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 864 | 8
Other Debt Obligations |  |
Investment securities available for sale: |  |
Less than 12 months, fair value |  | 5,349
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments |  | 182
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 |  | 5,349
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments |  | $ 182

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