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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year or less $ 76,691  
Due after one year through five years 569,239  
Due after five years through ten years 479,147  
Due after ten years 25,231  
Perpetual maturity securities 2,544  
Amortized Cost 1,152,852 $ 1,061,192
Fair Value    
Due in one year or less 75,226  
Due after one year through five years 516,320  
Due after five years through ten years 401,132  
Due after ten years 19,831  
Perpetual maturity securities 2,117  
Fair Value $ 1,014,626 $ 1,040,455