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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 5,257,891 | $ 5,340,271
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 83,342 | 24,777
Aggregate fair value, continuous unrealized loss position, 12 months or more | 362,351 | 280,126
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,689 | 6,094
Total fair value | 5,620,242 | 5,620,397
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 88,031 | 30,871
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 807,822 | 1,539,637
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 935 | 1,118
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 | 807,822 | 1,539,637
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 935 | 1,118
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value |  | 229,436
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments |  | 374
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 |  | 229,436
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 374
Mortgage Backed Securities, Other |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 4,442,700 | 3,570,470
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 82,161 | 23,275
Aggregate fair value, continuous unrealized loss position, 12 months or more | 362,351 | 280,126
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,689 | 6,094
Total fair value | 4,805,051 | 3,850,596
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 86,850 | 29,369
Equity Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value |  | 728
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments |  | 10
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 |  | 728
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 10
Other Debt Obligations |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 7,369 |
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 246 |
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 | 7,369 |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 246 | $ 0

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