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Debt Securities - Maturity of Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 109,189  
Due after one year through five years 312,419  
Due after five years through ten years 431,297  
Due after ten years 1,664,389  
Amortized Cost 2,517,294 $ 2,772,453
Fair Value    
Due in one year or less 106,940  
Due after one year through five years 289,027  
Due after five years through ten years 389,702  
Due after ten years 1,397,172  
Fair Value 2,182,841 2,461,393
Amortized Cost    
Due after one year through five years 63,474  
Due after five years through ten years 40,076  
Due after ten years 779,064  
Amortized Cost 882,614 918,312
Fair Value    
Due after one year through five years 58,144  
Due after five years through ten years 34,985  
Due after ten years 608,547  
Fair Value $ 701,676 $ 785,295