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Investment Securities - Schedule of Amortized Cost, Fair Value by Contractual Maturity of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investment securities HTM, Fair value    
Amortized Cost $ 2,638,071  
Investment securities AFS, Amortized cost    
Amortized Cost 7,571,447 $ 11,091,254
Investment securities AFS, Fair value    
Fair Value 7,043,681 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 2,668,068  
Amortized cost 2,668,068  
Investment securities HTM, Fair value    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,638,071  
Amortized Cost 2,638,071  
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,272,694  
Amortized Cost 2,272,694 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 2,016,045  
Fair Value 2,016,045 6,430,379
U.S. Treasury securities    
Investment securities AFS, Amortized cost    
Within One Year 20,101  
1 to 5 Years 725,093  
5 to 10 Years 431,812  
More Than 10 Years 0  
Amortized Cost 1,177,006 588,082
Investment securities AFS, Fair value    
Within One Year 20,101  
1 to 5 Years 723,824  
5 to 10 Years 430,370  
More Than 10 Years 0  
Fair Value 1,174,295 597,629
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 28,843  
5 to 10 Years 0  
More Than 10 Years 0  
Fair Value 28,843 28,940
Mortgage-backed securities issued by U.S. Government agencies    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 55  
5 to 10 Years 3  
More Than 10 Years 1,518,166  
Amortized Cost 1,518,224 1,021,612
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 53  
5 to 10 Years 3  
More Than 10 Years 1,400,436  
Fair Value 1,400,492 925,664
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 34  
5 to 10 Years 9,314  
More Than 10 Years 650,358  
Amortized Cost 659,706 692,487
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 33  
5 to 10 Years 8,951  
More Than 10 Years 539,013  
Fair Value 547,997 587,595
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 906,290  
5 to 10 Years 981,249  
More Than 10 Years 17,226  
Amortized Cost 1,904,765 1,226,672
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 891,131  
5 to 10 Years 961,318  
More Than 10 Years 14,677  
Fair Value 1,867,126 1,209,783
Corporate debt securities and other debt securities    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 9,059  
5 to 10 Years 0  
More Than 10 Years 0  
Amortized Cost 9,059 9,009
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 8,883  
5 to 10 Years 0  
More Than 10 Years 0  
Fair Value $ 8,883 $ 8,672