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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 6,725,062 | $ 760,153
Less than 12 months, unrealized losses | 54,666 | 6,466
Longer than 12 months, fair value | 191,286 | 351,841
Longer than 12 months, unrealized losses | 2,132 | 2,445
Total fair value | 6,916,348 | 1,111,994
Total unrealized losses | 56,798 | 8,911
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 1,810,924 |
Less than 12 months, unrealized losses | 1,924 |
Longer than 12 months, fair value | 0 |
Longer than 12 months, unrealized losses | 0 |
Total fair value | 1,810,924 |
Total unrealized losses | 1,924 |
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 222,401 | 268,622
Less than 12 months, unrealized losses | 1,516 | 3,197
Longer than 12 months, fair value | 189,935 | 328,777
Longer than 12 months, unrealized losses | 2,108 | 2,376
Total fair value | 412,336 | 597,399
Total unrealized losses | 3,624 | 5,573
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 3,992,305 | 433,816
Less than 12 months, unrealized losses | 36,769 | 1,241
Longer than 12 months, fair value | 1,351 | 23,064
Longer than 12 months, unrealized losses | 24 | 69
Total fair value | 3,993,656 | 456,880
Total unrealized losses | 36,793 | 1,310
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 647,101 |
Less than 12 months, unrealized losses | 13,924 |
Longer than 12 months, fair value | 0 |
Longer than 12 months, unrealized losses | 0 |
Total fair value | 647,101 |
Total unrealized losses | 13,924 |
Corporate Bonds |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 52,331 | 57,715
Less than 12 months, unrealized losses | 533 | 2,028
Longer than 12 months, fair value | 0 | 0
Longer than 12 months, unrealized losses | 0 | 0
Total fair value | 52,331 | 57,715
Total unrealized losses | $ 533 | $ 2,028

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