Investments - Amortized Cost and Estimated Fair Value, Net of Credit Loss Allowance, of Available-For-Sale Securities by Contractual Maturity (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Amortized cost
Due in one year or less	$ 24,580
Due after one year through five years	427,919
Due after five years through ten years	198,287
Due after ten years	310,349
Amortized cost	961,135
Estimated fair value
Due in one year or less	24,089
Due after one year through five years	403,985
Due after five years through ten years	186,693
Due after ten years	279,894
Estimated fair value	$ 894,661