Investments (Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in one year or less	$ 105,045
Amortized Cost, Due after one year through five years	108,438
Amortized Cost, Due after five years through ten years	65,005
Amortized Cost, Amortized Cost Due after ten years	7,857
Amortized Cost	288,175	$ 502,167
Fair Value, Due in one year or less	106,047
Fair Value, Due after one year through five years	109,195
Fair Value, Due after five years through ten years	64,926
Fair Value, Due after ten years	8,050
Fair Value	290,073	$ 507,279
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,830
Fair Value	$ 1,855