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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Available-for-sale, Amortized Cost    
Within one year $ 432,809  
One to five years 5,959,423  
Five to ten years 4,383,178  
Beyond ten years 1,284,587  
Amortized Cost 12,059,997 $ 8,480,508
Available-for-sale, Fair Value    
Within one year 434,821  
One to five years 5,926,983  
Five to ten years 3,964,296  
Beyond ten years 1,058,350  
Total $ 11,384,450 7,458,459
Available-for-sale, Weighted Average Yield    
Within one year 4.84%  
One to five years 4.70%  
Five to ten years 3.07%  
Beyond ten years 2.90%  
Total 3.92%  
Held-to-Maturity, Amortized Cost    
Within one year $ 18,432  
One to five years 54,147  
Five to ten years 1,483,026  
Beyond ten years 1,339,883  
Total held-to-maturity securities 2,895,488 2,954,881
Held-to-Maturity, Fair Value    
Within one year 18,419  
One to five years 50,352  
Five to ten years 1,310,131  
Beyond ten years 1,161,336  
Total $ 2,540,238 $ 2,471,138
Held-to-Maturity, Weighted Average Yield    
Within one year 3.21%  
One to five years 2.03%  
Five to ten years 2.53%  
Beyond ten years 2.81%  
Total 2.66%