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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Available for sale: |  |
Fair value, less than 12 months | $ 610,825 | $ 578,099
Unrealized losses, less than 12 Months | (6,515) | (8,268)
Fair value, 12 months or more | 3,416,137 | 3,520,722
Unrealized losses, 12 Months or More | (487,068) | (511,348)
Fair value, Total | 4,026,962 | 4,098,821
Unrealized losses, Total | (493,583) | (519,616)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 544,375 | 577,448
Unrealized losses, less than 12 Months | (4,126) | (8,267)
Fair value, 12 months or more | 3,358,586 | 3,456,349
Unrealized losses, 12 Months or More | (485,044) | (510,988)
Fair value, Total | 3,902,961 | 4,033,797
Unrealized losses, Total | (489,170) | (519,255)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 66,450 | 651
Unrealized losses, less than 12 Months | (2,389) | (1)
Fair value, 12 months or more | 57,551 | 64,373
Unrealized losses, 12 Months or More | (2,024) | (360)
Fair value, Total | 124,001 | 65,024
Unrealized losses, Total | $ (4,413) | $ (361)

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