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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available-for-sale, Amortized Cost    
Within one year $ 539,157  
One to five years 1,567,565  
Five to ten years 3,987,461  
Beyond ten years 1,625,761  
Total 7,719,944 $ 7,772,603
Available-for-sale, Fair Value    
Within one year 535,193  
One to five years 1,395,867  
Five to ten years 3,285,183  
Beyond ten years 1,198,518  
Total $ 6,414,761 6,773,712
Available-for-sale, Weighted Average Yield    
Within one year 4.71%  
One to five years 2.80%  
Five to ten years 2.37%  
Beyond ten years 2.46%  
Total 2.64%  
Held-to-Maturity, Amortized Cost    
One to five years $ 161,837  
Five to ten years 954,756  
Beyond ten years 1,911,321  
Total held-to-maturity securities 3,027,914 3,089,147
Held-to-Maturity, Fair Value    
One to five years 127,716  
Five to ten years 797,284  
Beyond ten years 1,468,621  
Total $ 2,393,621 $ 2,643,682
Held-to-Maturity, Weighted Average Yield    
One to five years 2.68%  
Five to ten years 2.64%  
Beyond ten years 2.71%  
Total 2.69%