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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Available-for-sale, Amortized Cost    
Within one year $ 193,329  
One to five years 2,585,791  
Five to ten years 4,432,629  
Beyond ten years 1,268,759  
Amortized Cost 8,480,508 $ 7,684,889
Available-for-sale, Fair Value    
Within one year 192,182  
One to five years 2,510,032  
Five to ten years 3,775,699  
Beyond ten years 980,546  
Total $ 7,458,459 6,713,055
Available-for-sale, Weighted Average Yield    
Within one year 3.49%  
One to five years 4.28%  
Five to ten years 2.60%  
Beyond ten years 2.66%  
Total 3.14%  
Held-to-Maturity, Amortized Cost    
One to five years $ 24,574  
Five to ten years 1,356,722  
Beyond ten years 1,573,585  
Total held-to-maturity securities 2,954,881 3,013,493
Held-to-Maturity, Fair Value    
One to five years 23,810  
Five to ten years 1,149,507  
Beyond ten years 1,297,821  
Total $ 2,471,138 $ 2,601,188
Held-to-Maturity, Weighted Average Yield    
One to five years 2.94%  
Five to ten years 2.57%  
Beyond ten years 2.74%  
Total 2.67%