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Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Investment Securities HTM and AFS (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investment securities HTM, Fair value    
Amortized Cost $ 2,727,898  
Investment securities AFS, Amortized cost    
Amortized Cost 7,826,870 $ 11,091,254
Investment securities AFS, Fair value    
Fair Value 7,554,168 9,788,662
Mortgage-backed securities issued by U.S. Government sponsored enterprises    
Investment securities HTM, Amortized cost    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,622,457  
Amortized cost 2,622,457  
Investment securities HTM, Fair value    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,727,898  
Amortized Cost 2,727,898  
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,242,750  
Amortized Cost 2,242,750 7,523,399
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,069,369  
Fair Value 2,069,369 6,430,379
U.S. Treasury securities    
Investment securities AFS, Amortized cost    
Within One Year 22,741  
1 to 5 Years 774,204  
5 to 10 Years 385,787  
More Than 10 Years 0  
Amortized Cost 1,182,732 588,082
Investment securities AFS, Fair value    
Within One Year 22,741  
1 to 5 Years 792,477  
5 to 10 Years 399,145  
More Than 10 Years 0  
Fair Value 1,214,363 597,629
U.S. Government agency securities    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 29,993  
5 to 10 Years 0  
More Than 10 Years 0  
Amortized Cost 29,993 29,993
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 29,613  
5 to 10 Years 0  
More Than 10 Years 0  
Fair Value 29,613 28,940
Mortgage-backed securities issued by U.S. Government agencies    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 50  
5 to 10 Years 3  
More Than 10 Years 1,594,596  
Amortized Cost 1,594,649 1,021,612
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 49  
5 to 10 Years 3  
More Than 10 Years 1,525,039  
Fair Value 1,525,091 925,664
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 27  
5 to 10 Years 8,890  
More Than 10 Years 665,416  
Amortized Cost 674,333 692,487
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 27  
5 to 10 Years 8,762  
More Than 10 Years 576,599  
Fair Value 585,388 587,595
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 1,065,288  
5 to 10 Years 1,010,913  
More Than 10 Years 17,127  
Amortized Cost 2,093,328 1,226,672
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 1,080,132  
5 to 10 Years 1,026,335  
More Than 10 Years 15,146  
Fair Value 2,121,613 1,209,783
Corporate debt securities and other debt securities    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 9,085  
5 to 10 Years 0  
More Than 10 Years 0  
Amortized Cost 9,085 9,009
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 8,731  
5 to 10 Years 0  
More Than 10 Years 0  
Fair Value $ 8,731 $ 8,672