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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Available-for-sale, Amortized Cost    
Within one year $ 315,154,000  
One to five years 1,731,888,000  
Five to ten years 4,076,303,000  
Beyond ten years 2,126,881,000  
Total 8,250,226,000 $ 7,384,033,000
Available-for-sale, Fair Value    
Within one year 314,532,000  
One to five years 1,662,131,000  
Five to ten years 3,738,698,000  
Beyond ten years 1,852,340,000  
Total $ 7,567,701,000 7,382,066,000
Available-for-sale, Weighted Average Yield    
Within one year 1.11%  
One to five years 2.56%  
Five to ten years 2.30%  
Beyond ten years 2.43%  
Total 2.34%  
Held-to-Maturity, Amortized Cost    
Within one year $ 100,000  
One to five years 70,765,000  
Five to ten years 987,729,000  
Beyond ten years 2,025,592,000  
Total 3,084,186,000 0
Held-to-Maturity, Fair Value    
Within one year 100,000  
One to five years 68,860,000  
Five to ten years 934,946,000  
Beyond ten years 1,775,384,000  
Total $ 2,779,290,000 $ 0
Held-to-Maturity, Weighted Average Yield    
Within one year 2.47%  
One to five years 3.72%  
Five to ten years 2.75%  
Beyond ten years 2.76%  
Total 2.78%