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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Available for sale: |  |
Fair value, less than 12 months | $ 1,526,071 | $ 3,037,188
Unrealized losses, less than 12 Months | (93,419) | (53,060)
Fair value, 12 months or more | 2,566,975 | 423,733
Unrealized losses, 12 Months or More | (511,853) | (5,177)
Fair value, Total | 4,093,046 | 3,460,921
Unrealized losses, Total | (605,272) | (58,237)
US Treasury Securities |  |
Available for sale: |  |
Fair value, less than 12 months | 49,394 |
Unrealized losses, less than 12 Months | (359) |
Fair value, Total | 49,394 |
Unrealized losses, Total | (359) |
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 1,357,905 | 3,037,188
Unrealized losses, less than 12 Months | (87,815) | (53,060)
Fair value, 12 months or more | 2,566,975 | 423,733
Unrealized losses, 12 Months or More | (511,853) | (5,177)
Fair value, Total | 3,924,880 | 3,460,921
Unrealized losses, Total | (599,668) | $ (58,237)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 118,772 |
Unrealized losses, less than 12 Months | (5,245) |
Fair value, Total | 118,772 |
Unrealized losses, Total | $ (5,245) |

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