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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Available-for-sale, Amortized Cost    
Within one year $ 177,458  
One to five years 1,991,571  
Five to ten years 4,193,417  
Beyond ten years 1,471,636  
Total 7,834,082 $ 7,684,889
Available-for-sale, Fair Value    
Within one year 174,950  
One to five years 1,848,581  
Five to ten years 3,608,726  
Beyond ten years 1,159,395  
Total $ 6,791,652 6,713,055
Available-for-sale, Weighted Average Yield    
Within one year 3.39%  
One to five years 3.44%  
Five to ten years 2.57%  
Beyond ten years 2.58%  
Total 2.81%  
Held-to-Maturity, Amortized Cost    
Within one year $ 157  
One to five years 160,838  
Five to ten years 1,161,402  
Beyond ten years 1,678,952  
Total held-to-maturity securities 3,001,349 3,013,493
Held-to-Maturity, Fair Value    
Within one year 147  
One to five years 132,056  
Five to ten years 1,006,755  
Beyond ten years 1,408,618  
Total $ 2,547,576 $ 2,601,188
Held-to-Maturity, Weighted Average Yield    
Within one year 2.23%  
One to five years 2.63%  
Five to ten years 2.62%  
Beyond ten years 2.73%  
Total 2.68%