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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Available for sale: |  |
Fair value, less than 12 months | $ 1,593,958 | $ 1,526,071
Unrealized losses, less than 12 Months | (45,986) | (93,419)
Fair value, 12 months or more | 2,969,348 | 2,566,975
Unrealized losses, 12 Months or More | (498,101) | (511,853)
Fair value, Total | 4,563,306 | 4,093,046
Unrealized losses, Total | (544,087) | (605,272)
US Treasury Securities |  |
Available for sale: |  |
Fair value, less than 12 months | 49,925 | 49,394
Unrealized losses, less than 12 Months | (42) | (359)
Fair value, Total | 49,925 | 49,394
Unrealized losses, Total | (42) | (359)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 1,438,275 | 1,357,905
Unrealized losses, less than 12 Months | (44,176) | (87,815)
Fair value, 12 months or more | 2,969,348 | 2,566,975
Unrealized losses, 12 Months or More | (498,101) | (511,853)
Fair value, Total | 4,407,623 | 3,924,880
Unrealized losses, Total | (542,277) | (599,668)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 105,758 | 118,772
Unrealized losses, less than 12 Months | (1,768) | (5,245)
Fair value, Total | 105,758 | 118,772
Unrealized losses, Total | $ (1,768) | $ (5,245)

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