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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Available for sale: |  |
Fair value, less than 12 months | $ 69,446 | $ 610,825
Unrealized losses, less than 12 Months | (2,227) | (6,515)
Fair value, 12 months or more | 3,266,595 | 3,416,137
Unrealized losses, 12 Months or More | (410,796) | (487,068)
Fair value, Total | 3,336,041 | 4,026,962
Unrealized losses, Total | (413,023) | (493,583)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 30,149 | 544,375
Unrealized losses, less than 12 Months | (73) | (4,126)
Fair value, 12 months or more | 3,177,133 | 3,358,586
Unrealized losses, 12 Months or More | (401,280) | (485,044)
Fair value, Total | 3,207,282 | 3,902,961
Unrealized losses, Total | (401,353) | (489,170)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 39,297 | 66,450
Unrealized losses, less than 12 Months | (2,154) | (2,389)
Fair value, 12 months or more | 89,462 | 57,551
Unrealized losses, 12 Months or More | (9,516) | (2,024)
Fair value, Total | 128,759 | 124,001
Unrealized losses, Total | $ (11,670) | $ (4,413)

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