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INVESTMENT SECURITIES - Schedule of Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Available-for-sale, Amortized Cost    
Within one year $ 147,175  
One to five years 3,002,732  
Five to ten years 8,382,230  
Beyond ten years 1,072,970  
Amortized Cost 12,605,107 $ 12,059,997
Available-for-sale, Fair Value    
Within one year 146,523  
One to five years 2,826,908  
Five to ten years 7,517,292  
Beyond ten years 825,911  
Total $ 11,316,634 11,384,450
Available-for-sale, Weighted Average Yield    
Within one year 4.76%  
One to five years 3.83%  
Five to ten years 4.16%  
Beyond ten years 3.31%  
Total 4.01%  
Held-to-Maturity, Amortized Cost    
Within one year $ 940  
One to five years 134,064  
Five to ten years 1,549,141  
Beyond ten years 1,138,782  
Total held-to-maturity securities 2,822,927 2,895,488
Held-to-Maturity, Fair Value    
Within one year 921  
One to five years 121,171  
Five to ten years 1,273,502  
Beyond ten years 868,303  
Total $ 2,263,897 $ 2,540,238
Held-to-Maturity, Weighted Average Yield    
Within one year 2.23%  
One to five years 2.68%  
Five to ten years 2.53%  
Beyond ten years 2.83%  
Total 2.66%