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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Available for sale: |  |
Fair value, less than 12 months | $ 578,099 | $ 1,526,071
Unrealized losses, less than 12 Months | (8,268) | (93,419)
Fair value, 12 months or more | 3,520,722 | 2,566,975
Unrealized losses, 12 Months or More | (511,348) | (511,853)
Fair value, Total | 4,098,821 | 4,093,046
Unrealized losses, Total | (519,616) | (605,272)
US Treasury Securities |  |
Available for sale: |  |
Fair value, less than 12 months |  | 49,394
Unrealized losses, less than 12 Months |  | (359)
Fair value, Total |  | 49,394
Unrealized losses, Total |  | (359)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 577,448 | 1,357,905
Unrealized losses, less than 12 Months | (8,267) | (87,815)
Fair value, 12 months or more | 3,456,349 | 2,566,975
Unrealized losses, 12 Months or More | (510,988) | (511,853)
Fair value, Total | 4,033,797 | 3,924,880
Unrealized losses, Total | (519,255) | (599,668)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 651 | 118,772
Unrealized losses, less than 12 Months | (1) | (5,245)
Fair value, 12 months or more | 64,373 |
Unrealized losses, 12 Months or More | (360) |
Fair value, Total | 65,024 | 118,772
Unrealized losses, Total | $ (361) | $ (5,245)

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