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Investments Securities - Schedule of Investment Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | $ 377,149 | $ 39,432
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (2) | (2,498)
Investments in AFS debt securities, 12 months or longer, fair value | 108,942 | 156,006
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (4,794) | (6,113)
Investments in AFS debt securities, total, fair value | 486,091 | 195,438
Investments in AFS debt securities, total, gross unrealized losses | (4,796) | (8,611)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 377,149 | 27,759
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (2) | (1,171)
Investments in AFS debt securities, 12 months or longer, fair value | 44,628 | 90,230
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (1,228) | (2,339)
Investments in AFS debt securities, total, fair value | 421,777 | 117,989
Investments in AFS debt securities, total, gross unrealized losses | (1,230) | (3,510)
Multinational securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | 0
Investments in AFS debt securities, 12 months or longer, fair value | 15,514 | 19,043
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (147) | (724)
Investments in AFS debt securities, total, fair value | 15,514 | 19,043
Investments in AFS debt securities, total, gross unrealized losses | (147) | (724)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 4,480
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | (313)
Investments in AFS debt securities, 12 months or longer, fair value | 33,225 | 35,023
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (1,701) | (2,331)
Investments in AFS debt securities, total, fair value | 33,225 | 39,503
Investments in AFS debt securities, total, gross unrealized losses | (1,701) | (2,644)
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 6,448
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | (814)
Investments in AFS debt securities, 12 months or longer, fair value | 6,850 | 1,482
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (1,228) | (177)
Investments in AFS debt securities, total, fair value | 6,850 | 7,930
Investments in AFS debt securities, total, gross unrealized losses | (1,228) | (991)
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | 0
Investments in AFS debt securities, 12 months or longer, fair value | 8,001 | 9,047
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (267) | (514)
Investments in AFS debt securities, total, fair value | 8,001 | 9,047
Investments in AFS debt securities, total, gross unrealized losses | (267) | (514)
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 745
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | (200)
Investments in AFS debt securities, 12 months or longer, fair value | 724 | 1,181
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (223) | (28)
Investments in AFS debt securities, total, fair value | 724 | 1,926
Investments in AFS debt securities, total, gross unrealized losses | $ (223) | $ (228)

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