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Debt Securities - Maturity Schedule (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Available-for-Sale, Amortized Cost    
Due within one year $ 77,093  
Due after one year through five years 236,705  
Due after five years through ten years 266,078  
Due after ten years 256,553  
Total before mortgage-backed securities 836,429  
Mortgage-backed securities 5,233,115  
Amortized Cost 6,069,544 $ 5,145,866
Available-for-Sale, Fair Value    
Due within one year 78,370  
Due after one year through five years 247,063  
Due after five years through ten years 274,949  
Due after ten years 276,540  
Total before mortgage-backed securities 876,922  
Mortgage-backed securities 5,270,221  
Debt securities, available-for-sale 6,147,143 5,337,814
Held-to-Maturity, Amortized Cost    
Due within one year 1,924  
Due after one year through five years 26,870  
Due after five years through ten years 86,095  
Due after ten years 909,841  
Total before mortgage-backed securities 1,024,730  
Mortgage-backed securities 0  
Amortized Cost 1,024,730 189,836
Held-to-Maturity, Fair Value    
Due within one year 1,956  
Due after one year through five years 28,562  
Due after five years through ten years 91,222  
Due after ten years 925,273  
Total before mortgage-backed securities 1,047,013  
Mortgage-backed securities 0  
Total $ 1,047,013 $ 203,216