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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Available-for-sale, Amortized Cost    
Within one year $ 103,486,000  
One to five years 1,757,898,000  
Five to ten years 3,863,056,000  
Beyond ten years 2,154,668,000  
Total 7,879,108,000 $ 7,384,033,000
Available-for-sale, Fair Value    
Within one year 102,344,000  
One to five years 1,640,096,000  
Five to ten years 3,374,078,000  
Beyond ten years 1,746,462,000  
Total $ 6,862,980,000 7,382,066,000
Available-for-sale, Weighted Average Yield    
Within one year 2.52%  
One to five years 2.73%  
Five to ten years 2.32%  
Beyond ten years 2.40%  
Total 2.44%  
Held-to-Maturity, Amortized Cost    
One to five years $ 71,344,000  
Five to ten years 977,435,000  
Beyond ten years 2,047,788,000  
Total held-to-maturity securities 3,096,567,000 0
Held-to-Maturity, Fair Value    
One to five years 66,878,000  
Five to ten years 867,476,000  
Beyond ten years 1,666,086,000  
Total $ 2,600,440,000 $ 0
Held-to-Maturity, Weighted Average Yield    
One to five years 3.63%  
Five to ten years 2.67%  
Beyond ten years 2.81%  
Total 2.78%