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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Available for sale: |  |
Fair value, less than 12 months | $ 2,226,274 | $ 3,037,188
Unrealized losses, less than 12 Months | (237,973) | (53,060)
Fair value, 12 months or more | 1,950,011 | 423,733
Unrealized losses, 12 Months or More | (343,218) | (5,177)
Fair value, Total | 4,176,285 | 3,460,921
Unrealized losses, Total | (581,191) | (58,237)
US Treasury Securities |  |
Available for sale: |  |
Fair value, less than 12 months | 48,992 |
Unrealized losses, less than 12 Months | (541) |
Fair value, Total | 48,992 |
Unrealized losses, Total | (541) |
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 2,091,227 | 3,037,188
Unrealized losses, less than 12 Months | (230,060) | (53,060)
Fair value, 12 months or more | 1,950,011 | 423,733
Unrealized losses, 12 Months or More | (343,218) | (5,177)
Fair value, Total | 4,041,238 | 3,460,921
Unrealized losses, Total | (573,278) | $ (58,237)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 86,055 |
Unrealized losses, less than 12 Months | (7,372) |
Fair value, Total | 86,055 |
Unrealized losses, Total | $ (7,372) |

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