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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
Mar. 31, 2025
Dec. 31, 2024
Investment securities HTM, Fair value    
Amortized Cost $ 2,534,215 $ 2,524,525
Investment securities AFS, Amortized cost    
Amortized Cost 8,236,196 8,079,918
Investment securities AFS, Fair value    
Fair Value 7,840,385 7,551,018
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 2,546,741  
Amortized cost 2,546,741  
Investment securities HTM, Fair value    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,534,215  
Amortized Cost 2,534,215 2,524,525
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,301,431  
Amortized Cost 2,301,431 2,294,700
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 0  
5 to 10 Years 0  
More Than 10 Years 2,085,468  
Fair Value 2,085,468 2,034,035
U.S. Treasury securities    
Investment securities AFS, Amortized cost    
Within One Year 101,250  
1 to 5 Years 827,377  
5 to 10 Years 288,927  
More Than 10 Years 0  
Amortized Cost 1,217,554 1,214,363
Investment securities AFS, Fair value    
Within One Year 101,724  
1 to 5 Years 836,868  
5 to 10 Years 292,965  
More Than 10 Years 0  
Fair Value 1,231,557 1,212,742
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 29,476  
5 to 10 Years 0  
More Than 10 Years 0  
Fair Value 29,476 29,163
Mortgage-backed securities issued by U.S. Government agencies    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 39  
5 to 10 Years 3  
More Than 10 Years 1,593,239  
Amortized Cost 1,593,281 1,583,331
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 39  
5 to 10 Years 3  
More Than 10 Years 1,495,761  
Fair Value 1,495,803 1,462,790
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 16  
5 to 10 Years 8,219  
More Than 10 Years 633,978  
Amortized Cost 642,213 657,453
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 15  
5 to 10 Years 8,029  
More Than 10 Years 539,326  
Fair Value 547,370 550,201
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises    
Investment securities AFS, Amortized cost    
Within One Year 9,605  
1 to 5 Years 1,443,431  
5 to 10 Years 972,627  
More Than 10 Years 16,926  
Amortized Cost 2,442,589 2,290,968
Investment securities AFS, Fair value    
Within One Year 9,468  
1 to 5 Years 1,440,969  
5 to 10 Years 976,594  
More Than 10 Years 14,667  
Fair Value 2,441,698 2,253,116
Corporate debt securities and other debt securities    
Investment securities AFS, Amortized cost    
Within One Year 0  
1 to 5 Years 9,135  
5 to 10 Years 0  
More Than 10 Years 0  
Amortized Cost 9,135 9,110
Investment securities AFS, Fair value    
Within One Year 0  
1 to 5 Years 9,013  
5 to 10 Years 0  
More Than 10 Years 0  
Fair Value $ 9,013 $ 8,971