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Debt Securities - Maturity Schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Available-for-Sale, Amortized Cost    
Due within one year $ 54,460  
Due after one year through five years 1,143,487  
Due after five years through ten years 815,328  
Due after ten years 221,694  
Total before mortgage-backed securities 2,234,969  
Mortgage-backed securities 6,940,454  
Amortized Cost 9,175,423 $ 5,145,866
Available-for-Sale, Fair Value    
Due within one year 54,824  
Due after one year through five years 1,146,529  
Due after five years through ten years 816,598  
Due after ten years 239,101  
Total before mortgage-backed securities 2,257,052  
Mortgage-backed securities 6,913,797  
Fair Value 9,170,849 5,337,814
Held-to-Maturity, Amortized Cost    
Due within one year 1,432  
Due after one year through five years 29,286  
Due after five years through ten years 91,688  
Due after ten years 1,076,758  
Total before mortgage-backed securities 1,199,164  
Mortgage-backed securities 0  
Amortized Cost 1,199,164 189,836
Held-to-Maturity, Fair Value    
Due within one year 1,445  
Due after one year through five years 30,932  
Due after five years through ten years 96,253  
Due after ten years 1,092,253  
Total before mortgage-backed securities 1,220,883  
Mortgage-backed securities 0  
Fair Value $ 1,220,883 $ 203,216