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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 487,273 | $ 2,778,014
Unrealized Losses, Less than 12 months | 6,001 | 16,025
Fair Value, 12 months or more | 366,630 | 332,953
Unrealized Losses, Greater than 12 months | 2,499 | 1,794
Fair Value, Total | 853,903 | 3,110,967
Gross unrealized losses | 8,500 | 17,819
Agency Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 187,167 | 347,081
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,570 | 1,827
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 338,169 | 63,947
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,391 | 414
Fair Value, Total | 525,336 | 411,028
Gross unrealized losses | 4,961 | 2,241
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 161,578 | 2,387,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 259 | 14,016
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23,717 | 264,257
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 53 | 1,371
Fair Value, Total | 185,295 | 2,651,550
Gross unrealized losses | 312 | 15,387
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 56,703 | 35,926
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 434 | 59
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Fair Value, Total | 56,703 | 35,926
Gross unrealized losses | 434 | 59
Corporate bonds |  |
Investment securities available for sale: |  |
Fair Value, Total |  | 12,463
Gross unrealized losses |  | 132
Corporate Bonds |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 81,825 | 7,714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,738 | 123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,744 | 4,749
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 55 | $ 9
Fair Value, Total | 86,569 |
Gross unrealized losses | $ 2,793 |

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