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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 110,000  
Due after one year through five years 593,152  
Due after five years through ten years 434,732  
Due after ten years 32,281  
Perpetual maturity securities 3,802  
Amortized Cost 1,173,967 $ 1,152,852
Fair Value    
Due in one year or less 107,919  
Due after one year through five years 539,398  
Due after five years through ten years 356,024  
Due after ten years 25,091  
Perpetual maturity securities 3,126  
Fair Value $ 1,031,558 $ 1,014,626