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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 5,340,271 | $ 1,173,274
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 24,777 | 2,203
Aggregate fair value, continuous unrealized loss position, 12 months or more | 280,126 | 832,420
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,094 | 10,043
Total fair value | 5,620,397 | 2,005,694
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 30,871 | 12,246
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 1,539,637 | 338,612
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 1,118 | 151
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 | 1,015
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 1
Total fair value | 1,539,637 | 339,627
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 1,118 | 152
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 229,436 | 261,288
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 374 | 247
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 | 229,436 | 261,288
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 374 | 247
Mortgage Backed Securities, Other |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 3,570,470 | 573,374
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 23,275 | 1,805
Aggregate fair value, continuous unrealized loss position, 12 months or more | 280,126 | 831,405
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,094 | 10,042
Total fair value | 3,850,596 | 1,404,779
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 29,369 | 11,847
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 | 10 |
Other Debt Obligations |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 0 |
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 0 |
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 | 0 |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 0 |
State, County and Municipal |  |
Investment securities available for sale: |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments |  | $ 0

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