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Investments Securities - Schedule of Investment Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | $ 600,155 | $ 500,942
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (660) | (215)
Investments in AFS debt securities, 12 months or longer, fair value | 63,383 | 94,245
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (2,553) | (3,005)
Investments in AFS debt securities, total, fair value | 663,538 | 595,187
Investments in AFS debt securities, total, gross unrealized losses | (3,213) | (3,220)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 337,363 | 480,012
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (97) | (58)
Investments in AFS debt securities, 12 months or longer, fair value | 29,502 | 39,065
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (487) | (722)
Investments in AFS debt securities, total, fair value | 366,865 | 519,077
Investments in AFS debt securities, total, gross unrealized losses | (584) | (780)
Multinational securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value |  | 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses |  | 0
Investments in AFS debt securities, 12 months or longer, fair value |  | 8,634
Investments in AFS debt securities, 12 months or longer, gross unrealized losses |  | (17)
Investments in AFS debt securities, total, fair value |  | 8,634
Investments in AFS debt securities, total, gross unrealized losses |  | (17)
Corporate bonds |  |
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 | 22,425 | 31,724
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (911) | (1,092)
Investments in AFS debt securities, total, fair value | 22,425 | 31,724
Investments in AFS debt securities, total, gross unrealized losses | (911) | (1,092)
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 262,792 | 20,930
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (563) | (157)
Investments in AFS debt securities, 12 months or longer, fair value | 6,680 | 6,912
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (892) | (859)
Investments in AFS debt securities, total, fair value | 269,472 | 27,842
Investments in AFS debt securities, total, gross unrealized losses | (1,455) | (1,016)
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 | 4,001 | 7,122
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (92) | (154)
Investments in AFS debt securities, total, fair value | 4,001 | 7,122
Investments in AFS debt securities, total, gross unrealized losses | (92) | (154)
Other |  |
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 | 775 | 788
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (171) | (161)
Investments in AFS debt securities, total, fair value | 775 | 788
Investments in AFS debt securities, total, gross unrealized losses | $ (171) | $ (161)

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