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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 3,241,180 | $ 760,153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 33,057 | 6,466
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 131,437 | 351,841
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 694 | 2,445
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,372,617 | 1,111,994
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 33,751 | 8,911
Agency Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 302,114 | 268,622
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,857 | 3,197
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 119,231 | 328,777
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 623 | 2,376
Debt Securities, Available-for-sale, Unrealized Loss Position | 421,345 | 597,399
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,480 | 5,573
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,137,675 | 433,816
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 17,752 | 1,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,762 | 23,064
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 15 | 69
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,139,437 | 456,880
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 17,767 | 1,310
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 758,798 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11,406 |
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 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 758,798 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 11,406 |
Corporate bonds |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 57,715
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 2,028
Corporate Bonds |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 42,593 | 57,715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,042 | 2,028
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10,444 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 56 | $ 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 53,037 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,098 |

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