Investments (Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in one year or less	$ 174,859
Amortized Cost, Due after one year through five years	139,088
Amortized Cost, Due after five years through ten years	23,022
Amortized Cost, Amortized Cost Due after ten years	6,261
Amortized Cost	344,714	$ 434,119
Fair Value, Due in one year or less	172,720
Fair Value, Due after one year through five years	137,135
Fair Value, Due after five years through ten years	22,807
Fair Value, Due after ten years	6,055
Fair Value	340,054	426,597
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,484	1,510
Fair Value	$ 1,337	$ 1,374