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Investments Securities - Schedule of Investments by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investments in AFS debt securities—Amortized cost:    
Due Within One Year $ 437,534  
Due After One Year Through Five Years 35,384  
Due After Five Years Through Ten Years 5,951  
Due After Ten Years 8,130  
Amortized Cost $ 486,999 $ 203,418
Weighted average yield for investments in AFS debt securities    
Due Within One Year 4.40%  
Due After One Year Through Five Years 3.50%  
Due After Five Years Through Ten Years 0.13%  
Due After Ten Years (1.51%)  
Total 3.92%  
AFS investment securities—Fair value:    
Due Within One Year $ 439,759  
Due After One Year Through Five Years 33,712  
Due After Five Years Through Ten Years 5,397  
Due After Ten Years 6,775  
Total 485,643  
Accrued Interest 448 631
U.S. Treasury securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 404,071  
Due After One Year Through Five Years 15,309  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Amortized Cost 419,380 121,282
AFS investment securities—Fair value:    
Due Within One Year 406,933  
Due After One Year Through Five Years 14,657  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Total 421,590  
Accrued Interest 187 217
Multinational securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 15,606  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Amortized Cost 15,606 19,658
AFS investment securities—Fair value:    
Due Within One Year 15,459  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Total 15,459  
Accrued Interest 55 109
Corporate bonds    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 15,922  
Due After One Year Through Five Years 15,514  
Due After Five Years Through Ten Years 3,315  
Due After Ten Years 0  
Amortized Cost 34,751 41,890
AFS investment securities—Fair value:    
Due Within One Year 15,503  
Due After One Year Through Five Years 14,670  
Due After Five Years Through Ten Years 2,877  
Due After Ten Years 0  
Total 33,050  
Accrued Interest 175 257
Agency mortgage-backed securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 0  
Due After One Year Through Five Years 149  
Due After Five Years Through Ten Years 720  
Due After Ten Years 7,190  
Amortized Cost 8,059 8,899
AFS investment securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 140  
Due After Five Years Through Ten Years 633  
Due After Ten Years 6,058  
Total 6,831  
Accrued Interest 19 22
Other asset-backed securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 1,935  
Due After One Year Through Five Years 4,412  
Due After Five Years Through Ten Years 1,916  
Due After Ten Years 0  
Amortized Cost 8,263 9,556
AFS investment securities—Fair value:    
Due Within One Year 1,864  
Due After One Year Through Five Years 4,245  
Due After Five Years Through Ten Years 1,887  
Due After Ten Years 0  
Total 7,996  
Accrued Interest 5 5
Other    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 0  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 0  
Due After Ten Years 940  
Amortized Cost 940 2,133
AFS investment securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 0  
Due After Ten Years 717  
Total 717  
Accrued Interest $ 7 $ 21