Investments, Debt Securities, Amortized Cost and Fair Value by Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Due in one year or less	$ 14,108
Due after one year through five years	199,749
Due after five years through ten years	110,505
Due after ten years	171,050
Amortized cost	495,412	$ 412,018
Available-for-Sale Debt Securities, Fair Value [Abstract]
Due in one year or less	13,996
Due after one year through five years	184,858
Due after five years through ten years	97,613
Due after ten years	148,755
Fair value	$ 445,222	$ 412,402