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Securities (Scheduled Contractual Maturities of AFS Debt Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due within one year $ 1,482,716  
Due after one year through five years 1,191,837  
Due after five years through ten years 1,413,217  
Due after ten years 5,999,409  
Amortized Cost 10,087,179 $ 5,470,523
Fair Value    
Due within one year 1,440,069  
Due after one year through five years 1,189,880  
Due after five years through ten years 1,408,494  
Due after ten years 5,926,910  
Total available-for-sale Debt securities 9,965,353 5,544,658
Available-for-sale debt securities pledged as collateral at fair value $ 803,896 $ 588,484