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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Available-for-sale, Amortized Cost    
Within one year $ 108,432,000  
One to five years 1,821,584,000  
Five to ten years 4,289,711,000  
Beyond ten years 1,552,876,000  
Amortized Cost 7,772,603,000 $ 7,384,033,000
Available-for-sale, Fair Value    
Within one year 106,803,000  
One to five years 1,697,506,000  
Five to ten years 3,722,857,000  
Beyond ten years 1,246,546,000  
Total $ 6,773,712,000 7,382,066,000
Available-for-sale, Weighted Average Yield    
Within one year 2.67%  
One to five years 2.83%  
Five to ten years 2.32%  
Beyond ten years 2.52%  
Total 2.48%  
Held-to-Maturity, Amortized Cost    
One to five years $ 71,144,000  
Five to ten years 1,211,517,000  
Beyond ten years 1,806,486,000  
Total held-to-maturity securities 3,089,147,000 0
Held-to-Maturity, Fair Value    
One to five years 65,481,000  
Five to ten years 1,079,532,000  
Beyond ten years 1,498,669,000  
Total $ 2,643,682,000 $ 0
Held-to-Maturity, Weighted Average Yield    
One to five years 3.56%  
Five to ten years 2.73%  
Beyond ten years 2.83%  
Total 2.81%