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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Available-for-sale, Amortized Cost    
Within one year $ 141,160  
One to five years 1,751,081  
Five to ten years 4,031,392  
Beyond ten years 1,669,132  
Total 7,592,765 $ 7,772,603
Available-for-sale, Fair Value    
Within one year 138,855  
One to five years 1,635,833  
Five to ten years 3,556,971  
Beyond ten years 1,355,407  
Total $ 6,687,066 6,773,712
Available-for-sale, Weighted Average Yield    
Within one year 3.10%  
One to five years 2.79%  
Five to ten years 2.34%  
Beyond ten years 2.41%  
Total 2.47%  
Held-to-Maturity, Amortized Cost    
One to five years $ 162,300  
Five to ten years 928,090  
Beyond ten years 1,980,800  
Total held-to-maturity securities 3,071,190 3,089,147
Held-to-Maturity, Fair Value    
One to five years 141,113  
Five to ten years 838,844  
Beyond ten years 1,683,417  
Total $ 2,663,374 $ 2,643,682
Held-to-Maturity, Weighted Average Yield    
One to five years 2.74%  
Five to ten years 2.67%  
Beyond ten years 2.73%  
Total 2.71%