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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Available for sale: |  |
Fair value, less than 12 months | $ 134,922 | $ 610,825
Unrealized losses, less than 12 Months | (140) | (6,515)
Fair value, 12 months or more | 3,108,044 | 3,416,137
Unrealized losses, 12 Months or More | (337,527) | (487,068)
Fair value, Total | 3,242,966 | 4,026,962
Unrealized losses, Total | (337,667) | (493,583)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 130,561 | 544,375
Unrealized losses, less than 12 Months | (81) | (4,126)
Fair value, 12 months or more | 3,002,781 | 3,358,586
Unrealized losses, 12 Months or More | (332,103) | (485,044)
Fair value, Total | 3,133,342 | 3,902,961
Unrealized losses, Total | (332,184) | (489,170)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 4,361 | 66,450
Unrealized losses, less than 12 Months | (59) | (2,389)
Fair value, 12 months or more | 105,263 | 57,551
Unrealized losses, 12 Months or More | (5,424) | (2,024)
Fair value, Total | 109,624 | 124,001
Unrealized losses, Total | $ (5,483) | $ (4,413)

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