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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Available for sale: |  |
Fair value, less than 12 months | $ 2,960,880 | $ 3,037,188
Unrealized losses, less than 12 Months | (254,989) | (53,060)
Fair value, 12 months or more | 1,029,269 | 423,733
Unrealized losses, 12 Months or More | (99,366) | (5,177)
Fair value, Total | 3,990,149 | 3,460,921
Unrealized losses, Total | (354,355) | (58,237)
US Treasury Securities [Member] |  |
Available for sale: |  |
Fair value, less than 12 months | 48,951 |
Unrealized losses, less than 12 Months | (363) |
Fair value, Total | 48,951 |
Unrealized losses, Total | (363) |
Residential Mortgage Backed Securities [Member] |  |
Available for sale: |  |
Fair value, less than 12 months | 2,892,440 | 3,037,188
Unrealized losses, less than 12 Months | (254,453) | (53,060)
Fair value, 12 months or more | 1,029,269 | 423,733
Unrealized losses, 12 Months or More | (99,366) | (5,177)
Fair value, Total | 3,921,709 | 3,460,921
Unrealized losses, Total | (353,819) | $ (58,237)
States and Political Subdivisions Debt Securities [Member] |  |
Available for sale: |  |
Fair value, less than 12 months | 19,489 |
Unrealized losses, less than 12 Months | (173) |
Fair value, Total | 19,489 |
Unrealized losses, Total | $ (173) |

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