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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 3,370,304 | $ 760,153
Unrealized Losses, Less than 12 months | 41,407 | 6,466
Fair Value, 12 months or more | 454,057 | 351,841
Unrealized Losses, Greater than 12 months | 3,481 | 2,445
Fair Value, Total | 3,824,361 | 1,111,994
Gross unrealized losses | 44,888 | 8,911
Agency Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 331,034 | 268,622
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,501 | 3,197
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 415,379 | 328,777
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,902 | 2,376
Fair Value, Total | 746,413 | 597,399
Gross unrealized losses | 6,403 | 5,573
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,345,301 | 433,816
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 26,001 | 1,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,495 | 23,064
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 45 | 69
Fair Value, Total | 2,357,796 | 456,880
Gross unrealized losses | 26,046 | 1,310
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 685,575 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11,891 |
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 | 685,575 |
Gross unrealized losses | 11,891 | 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 | 8,394 | 57,715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 2,028
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 26,183 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 534 | $ 0
Fair Value, Total | 34,577 |
Gross unrealized losses | $ 548 |

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