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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Available for sale: |  |
Fair value, less than 12 months | $ 1,672,076 | $ 1,462,232
Unrealized losses, less than 12 Months | (6,661) | (9,339)
Fair value, 12 months or more | 12,811 | 757
Unrealized losses, 12 Months or More | (32) | (14)
Fair value, Total | 1,684,887 | 1,462,989
Unrealized losses, Total | (6,693) | (9,353)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 1,672,076 | 1,462,232
Unrealized losses, less than 12 Months | (6,661) | (9,339)
Fair value, 12 months or more | 12,275 |
Unrealized losses, 12 Months or More | (23) |
Fair value, Total | 1,684,351 | 1,462,232
Unrealized losses, Total | (6,684) | (9,339)
States and political subdivisions |  |
Available for sale: |  |
Fair value, 12 months or more | 536 | 757
Unrealized losses, 12 Months or More | (9) | (14)
Fair value, Total | 536 | 757
Unrealized losses, Total | $ (9) | $ (14)

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