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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Available-for-sale, Amortized Cost    
Within one year $ 264,290  
One to five years 3,046,912  
Five to ten years 4,122,674  
Beyond ten years 1,209,250  
Total 8,643,126 $ 8,480,508
Available-for-sale, Fair Value    
Within one year 263,634  
One to five years 2,993,580  
Five to ten years 3,545,254  
Beyond ten years 951,503  
Total $ 7,753,971 7,458,459
Available-for-sale, Weighted Average Yield    
Within one year 3.86%  
One to five years 4.44%  
Five to ten years 2.47%  
Beyond ten years 2.65%  
Total 3.23%  
Held-to-Maturity, Amortized Cost    
Within one year $ 18,135  
One to five years 9,030  
Five to ten years 1,386,527  
Beyond ten years 1,529,091  
Total held-to-maturity securities 2,942,783 2,954,881
Held-to-Maturity, Fair Value    
Within one year 17,958  
One to five years 8,439  
Five to ten years 1,198,525  
Beyond ten years 1,260,611  
Total $ 2,485,533 $ 2,471,138
Held-to-Maturity, Weighted Average Yield    
Within one year 3.21%  
One to five years 2.24%  
Five to ten years 2.58%  
Beyond ten years 2.74%  
Total 2.67%