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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 2,802,433 | $ 760,153
Unrealized Losses, Less than 12 months | 25,541 | 6,466
Fair Value, 12 months or more | 140,913 | 351,841
Unrealized Losses, Greater than 12 months | 943 | 2,445
Fair Value, Total | 2,943,346 | 1,111,994
Gross unrealized losses | 26,484 | 8,911
Agency Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 301,934 | 268,622
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,040 | 3,197
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 124,577 | 328,777
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 707 | 2,376
Fair Value, Total | 426,511 | 597,399
Gross unrealized losses | 3,747 | 5,573
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,849,194 | 433,816
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14,305 | 1,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,068 | 23,064
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 19 | 69
Fair Value, Total | 1,851,262 | 456,880
Gross unrealized losses | 14,324 | 1,310
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 648,803 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,196 |
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 | 648,803 |
Gross unrealized losses | 8,196 | 0
Corporate bonds |  |
Investment securities available for sale: |  |
Fair Value, Total |  | 57,715
Gross unrealized losses |  | 2,028
Corporate Bonds |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,502 | 57,715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 2,028
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,268 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 217 | $ 0
Fair Value, Total | 16,770 |
Gross unrealized losses | $ 217 |

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