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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Available for sale: |  |
Fair value, less than 12 months | $ 47,131 | $ 610,825
Unrealized losses, less than 12 Months | (1,254) | (6,515)
Fair value, 12 months or more | 3,179,415 | 3,416,137
Unrealized losses, 12 Months or More | (358,661) | (487,068)
Fair value, Total | 3,226,546 | 4,026,962
Unrealized losses, Total | (359,915) | (493,583)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 5,651 | 544,375
Unrealized losses, less than 12 Months | (11) | (4,126)
Fair value, 12 months or more | 3,096,713 | 3,358,586
Unrealized losses, 12 Months or More | (353,600) | (485,044)
Fair value, Total | 3,102,364 | 3,902,961
Unrealized losses, Total | (353,611) | (489,170)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 41,480 | 66,450
Unrealized losses, less than 12 Months | (1,243) | (2,389)
Fair value, 12 months or more | 82,702 | 57,551
Unrealized losses, 12 Months or More | (5,061) | (2,024)
Fair value, Total | 124,182 | 124,001
Unrealized losses, Total | $ (6,304) | $ (4,413)

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