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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Available-for-sale, Amortized Cost    
Within one year $ 291,158  
One to five years 3,181,494  
Five to ten years 7,175,378  
Beyond ten years 1,183,411  
Total 11,831,441 $ 8,480,508
Available-for-sale, Fair Value    
Within one year 290,051  
One to five years 3,139,051  
Five to ten years 6,646,934  
Beyond ten years 929,160  
Total $ 11,005,196 7,458,459
Available-for-sale, Weighted Average Yield    
Within one year 3.92%  
One to five years 4.48%  
Five to ten years 3.80%  
Beyond ten years 2.65%  
Total 3.87%  
Held-to-Maturity, Amortized Cost    
Within one year $ 18,232  
One to five years 51,266  
Five to ten years 1,344,104  
Beyond ten years 1,512,766  
Total held-to-maturity securities 2,926,368 2,954,881
Held-to-Maturity, Fair Value    
Within one year 18,101  
One to five years 46,861  
Five to ten years 1,167,923  
Beyond ten years 1,237,462  
Total $ 2,470,347 $ 2,471,138
Held-to-Maturity, Weighted Average Yield    
Within one year 3.21%  
One to five years 2.02%  
Five to ten years 2.57%  
Beyond ten years 2.75%  
Total 2.66%