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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
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)