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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Available-for-sale, Amortized Cost    
Within one year $ 242,424  
One to five years 1,621,101  
Five to ten years 3,926,306  
Beyond ten years 1,761,427  
Total 7,551,258 $ 7,772,603
Available-for-sale, Fair Value    
Within one year 238,951  
One to five years 1,478,764  
Five to ten years 3,374,584  
Beyond ten years 1,408,216  
Total $ 6,500,515 6,773,712
Available-for-sale, Weighted Average Yield    
Within one year 3.93%  
One to five years 2.77%  
Five to ten years 2.35%  
Beyond ten years 2.43%  
Total 2.51%  
Held-to-Maturity, Amortized Cost    
One to five years $ 162,082  
Five to ten years 888,640  
Beyond ten years 2,004,275  
Total held-to-maturity securities 3,054,997 3,089,147
Held-to-Maturity, Fair Value    
One to five years 135,763  
Five to ten years 780,437  
Beyond ten years 1,686,858  
Total $ 2,603,058 $ 2,643,682
Held-to-Maturity, Weighted Average Yield    
One to five years 2.71%  
Five to ten years 2.61%  
Beyond ten years 2.73%  
Total 2.69%