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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale, Amortized Cost    
Within one year $ 201,863  
One to five years 2,465,325  
Five to ten years 4,194,624  
Beyond ten years 1,306,696  
Total 8,168,508 $ 7,684,889
Available-for-sale, Fair Value    
Within one year 199,144  
One to five years 2,302,561  
Five to ten years 3,585,179  
Beyond ten years 1,018,594  
Total $ 7,105,478 6,713,055
Available-for-sale, Weighted Average Yield    
Within one year 3.31%  
One to five years 3.73%  
Five to ten years 2.63%  
Beyond ten years 2.65%  
Total 2.98%  
Held-to-Maturity, Amortized Cost    
Within one year $ 158  
One to five years 164,614  
Five to ten years 1,179,654  
Beyond ten years 1,642,023  
Total held-to-maturity securities 2,986,449 3,013,493
Held-to-Maturity, Fair Value    
Within one year 148  
One to five years 134,416  
Five to ten years 1,015,361  
Beyond ten years 1,362,577  
Total $ 2,512,502 $ 2,601,188
Held-to-Maturity, Weighted Average Yield    
Within one year 2.19%  
One to five years 2.59%  
Five to ten years 2.63%  
Beyond ten years 2.72%  
Total 2.68%