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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Available-for-sale, Amortized Cost    
Within one year $ 408,483  
One to five years 2,841,655  
Five to ten years 3,716,071  
Beyond ten years 1,267,023  
Total 8,233,232 $ 7,684,889
Available-for-sale, Fair Value    
Within one year 409,578  
One to five years 2,728,724  
Five to ten years 3,257,518  
Beyond ten years 1,036,620  
Total $ 7,432,440 6,713,055
Available-for-sale, Weighted Average Yield    
Within one year 4.31%  
One to five years 3.87%  
Five to ten years 2.39%  
Beyond ten years 2.66%  
Total 3.04%  
Held-to-Maturity, Amortized Cost    
Within one year $ 153  
One to five years 164,752  
Five to ten years 1,248,019  
Beyond ten years 1,556,419  
Total held-to-maturity securities 2,969,343 3,013,493
Held-to-Maturity, Fair Value    
Within one year 146  
One to five years 139,140  
Five to ten years 1,115,473  
Beyond ten years 1,349,296  
Total $ 2,604,055 $ 2,601,188
Held-to-Maturity, Weighted Average Yield    
Within one year 2.20%  
One to five years 2.56%  
Five to ten years 2.65%  
Beyond ten years 2.72%  
Total 2.68%