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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Available for sale: |  |
Fair value, less than 12 months | $ 120,141 | $ 578,099
Unrealized losses, less than 12 Months | (443) | (8,268)
Fair value, 12 months or more | 3,616,177 | 3,520,722
Unrealized losses, 12 Months or More | (418,891) | (511,348)
Fair value, Total | 3,736,318 | 4,098,821
Unrealized losses, Total | (419,334) | (519,616)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 77,574 | 577,448
Unrealized losses, less than 12 Months | (178) | (8,267)
Fair value, 12 months or more | 3,557,172 | 3,456,349
Unrealized losses, 12 Months or More | (418,268) | (510,988)
Fair value, Total | 3,634,746 | 4,033,797
Unrealized losses, Total | (418,446) | (519,255)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 42,567 | 651
Unrealized losses, less than 12 Months | (265) | (1)
Fair value, 12 months or more | 59,005 | 64,373
Unrealized losses, 12 Months or More | (623) | (360)
Fair value, Total | 101,572 | 65,024
Unrealized losses, Total | $ (888) | $ (361)

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