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Debt Securities - Maturity Schedule (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Available-for-Sale, Amortized Cost    
Due within one year $ 1,895  
Due after one year through five years 852,614  
Due after five years through ten years 40,945  
Due after ten years 43,630  
Total before mortgage-backed securities 939,084  
Mortgage-backed securities 4,804,529  
Amortized Cost 5,743,613 $ 5,930,103
Available-for-Sale, Fair Value    
Due within one year 1,884  
Due after one year through five years 788,517  
Due after five years through ten years 39,565  
Due after ten years 41,694  
Total before mortgage-backed securities 871,660  
Mortgage-backed securities 4,326,653  
Debt securities, available-for-sale 5,198,313 5,307,307
Held-to-Maturity, Amortized Cost    
Due within one year 2,834  
Due after one year through five years 778,384  
Due after five years through ten years 307,011  
Due after ten years 1,435,658  
Total before mortgage-backed securities 2,523,887  
Mortgage-backed securities 1,140,506  
Amortized Cost 3,664,393 3,715,052
Held-to-Maturity, Fair Value    
Due within one year 2,828  
Due after one year through five years 717,869  
Due after five years through ten years 286,156  
Due after ten years 1,238,273  
Total before mortgage-backed securities 2,245,126  
Mortgage-backed securities 1,047,627  
Total $ 3,292,753 $ 3,274,792