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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Available for sale: |  |
Fair value, less than 12 months | $ 3,037,188 | $ 1,462,232
Unrealized losses, less than 12 Months | (53,060) | (9,339)
Fair value, 12 months or more | 423,733 | 757
Unrealized losses, 12 Months or More | (5,177) | (14)
Fair value, Total | 3,460,921 | 1,462,989
Unrealized losses, Total | (58,237) | (9,353)
Residential Mortgage Backed Securities [Member] |  |
Available for sale: |  |
Fair value, less than 12 months | 3,037,188 | 1,462,232
Unrealized losses, less than 12 Months | (53,060) | (9,339)
Fair value, 12 months or more | 423,733 |
Unrealized losses, 12 Months or More | (5,177) |
Fair value, Total | 3,460,921 | 1,462,232
Unrealized losses, Total | $ (58,237) | (9,339)
States and Political Subdivisions Debt Securities [Member] |  |
Available for sale: |  |
Fair value, 12 months or more |  | 757
Unrealized losses, 12 Months or More |  | (14)
Fair value, Total |  | 757
Unrealized losses, Total |  | $ (14)

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