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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 732,783 | $ 2,778,014
Unrealized Losses, Less than 12 months | 9,131 | 16,025
Fair Value, 12 months or more | 217,427 | 332,953
Unrealized Losses, Greater than 12 months | 1,056 | 1,794
Fair Value, Total | 950,210 | 3,110,967
Unrealized Losses, Total | 10,187 | 17,819
Investment securities held to maturity |  |
Unrealized Losses, Total | 0 |
Agency Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 447,983 | 347,081
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,709 | 1,827
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 58,806 | 63,947
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 547 | 414
Fair Value, Total | 506,789 | 411,028
Unrealized Losses, Total | 4,256 | 2,241
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 172,628 | 2,387,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 302 | 14,016
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 149,170 | 264,257
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 392 | 1,371
Fair Value, Total | 321,798 | 2,651,550
Unrealized Losses, Total | 694 | 15,387
Investment securities held to maturity |  |
Unrealized Losses, Total | 0 |
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 35,926
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 59
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Fair Value, Total |  | 35,926
Unrealized Losses, Total | 0 | 59
Investment securities held to maturity |  |
Unrealized Losses, Total | 0 |
Residential mortgage-backed securities |  |
Investment securities held to maturity |  |
Unrealized Losses, Total |  | 0
Corporate bonds |  |
Investment securities available for sale: |  |
Fair Value, Total |  | 12,463
Unrealized Losses, Total |  | 132
Corporate Bonds |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 112,172 | 7,714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,120 | 123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 9,451 | 4,749
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 117 | 9
Fair Value, Total | 121,623 |
Unrealized Losses, Total | 5,237 |
Other |  |
Investment securities held to maturity |  |
Unrealized Losses, Total | $ 0 | $ 0

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