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Investments Securities - Schedule of Investments by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investments in AFS debt securities—Amortized cost:    
Due Within One Year $ 470,348  
Due After One Year Through Five Years 20,019  
Due After Five Years Through Ten Years 14,019  
Due After Ten Years 335,550  
Amortized Cost $ 839,936 $ 596,757
Weighted average yield for investments in AFS debt securities    
Due Within One Year 6.14%  
Due After One Year Through Five Years 1.33%  
Due After Five Years Through Ten Years 1.47%  
Due After Ten Years 2.80%  
Total 5.11%  
AFS investment securities—Fair value:    
Due Within One Year $ 469,858  
Due After One Year Through Five Years 19,329  
Due After Five Years Through Ten Years 13,477  
Due After Ten Years 334,366  
Total 837,030  
Accrued Interest 1,476 639
U.S. Treasury securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 459,383  
Due After One Year Through Five Years 6,376  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Amortized Cost 465,759 518,673
AFS investment securities—Fair value:    
Due Within One Year 459,077  
Due After One Year Through Five Years 6,135  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Total 465,212  
Accrued Interest 279 206
Corporate bonds    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 10,965  
Due After One Year Through Five Years 9,429  
Due After Five Years Through Ten Years 3,298  
Due After Ten Years 0  
Amortized Cost 23,692 32,609
AFS investment securities—Fair value:    
Due Within One Year 10,781  
Due After One Year Through Five Years 9,079  
Due After Five Years Through Ten Years 2,922  
Due After Ten Years 0  
Total 22,782  
Accrued Interest 153 207
Agency mortgage-backed securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 0  
Due After One Year Through Five Years 122  
Due After Five Years Through Ten Years 10,721  
Due After Ten Years 334,608  
Amortized Cost 345,451 28,714
AFS investment securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 115  
Due After Five Years Through Ten Years 10,555  
Due After Ten Years 333,595  
Total 344,265  
Accrued Interest 1,039 111
Other asset-backed securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 0  
Due After One Year Through Five Years 4,092  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Amortized Cost 4,092 7,272
AFS investment securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 4,000  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Total 4,000  
Accrued Interest 1 4
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 942  
Amortized Cost 942 941
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 771  
Total 771  
Accrued Interest $ 4 $ 8