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Investment Securities - Schedule of Investments by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Investments in AFS debt securities—Amortized cost:    
Due Within One Year $ 8  
Due After One Year Through Five Years 195,448  
Due After Five Years Through Ten Years 470,947  
Due After Ten Years 3,326,918  
Total $ 3,993,321 $ 2,434,627
Weighted average yield for investments in AFS debt securities    
Due Within One Year 0.95%  
Due After One Year Through Five Years 4.03%  
Due After Five Years Through Ten Years 4.21%  
Due After Ten Years 4.62%  
Total 4.55%  
Investments in AFS debt securities—Fair value:    
Due Within One Year $ 8  
Due After One Year Through Five Years 193,545  
Due After Five Years Through Ten Years 467,423  
Due After Ten Years 3,316,337  
Total 3,977,313  
Accrued Interest 15,997 6,342
U.S. Treasury securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 0  
Due After One Year Through Five Years 148,886  
Due After Five Years Through Ten Years 417,729  
Due After Ten Years 0  
Total 566,615 74,540
Investments in AFS debt securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 147,111  
Due After Five Years Through Ten Years 414,866  
Due After Ten Years 0  
Total 561,977  
Accrued Interest 7,579 1,115
Agency mortgage-backed securities    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 8  
Due After One Year Through Five Years 46,469  
Due After Five Years Through Ten Years 36,449  
Due After Ten Years 3,326,918  
Total 3,409,844 2,335,501
Investments in AFS debt securities—Fair value:    
Due Within One Year 8  
Due After One Year Through Five Years 46,342  
Due After Five Years Through Ten Years 36,048  
Due After Ten Years 3,316,337  
Total 3,398,735  
Accrued Interest 8,328 5,095
Corporate bonds    
Investments in AFS debt securities—Amortized cost:    
Due Within One Year 0  
Due After One Year Through Five Years 93  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Total 93 184
Investments in AFS debt securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 92  
Due After Five Years Through Ten Years 0  
Due After Ten Years 0  
Total 92  
Accrued Interest 1 3
Asset-backed bonds    
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 12,421  
Due After Ten Years 0  
Total 12,421 19,626
Investments in AFS debt securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 12,387  
Due After Ten Years 0  
Total 12,387  
Accrued Interest 54 83
Residual investments    
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 3,394  
Due After Ten Years 0  
Total 3,394 3,825
Investments in AFS debt securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 3,307  
Due After Ten Years 0  
Total 3,307  
Accrued Interest 27 38
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 954  
Due After Ten Years 0  
Total 954 951
Investments in AFS debt securities—Fair value:    
Due Within One Year 0  
Due After One Year Through Five Years 0  
Due After Five Years Through Ten Years 815  
Due After Ten Years 0  
Total 815  
Accrued Interest $ 8 $ 8