Investments, Debt Securities, Amortized Cost and Fair Value by Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Due in one year or less	$ 44,257
Due after one year through five years	170,521
Due after five years through ten years	98,835
Due after ten years	156,275
Amortized cost	469,888	$ 486,993
Available-for-Sale Debt Securities, Fair Value [Abstract]
Due in one year or less	43,316
Due after one year through five years	155,161
Due after five years through ten years	86,730
Due after ten years	132,600
Fair value	$ 417,807	$ 439,506