Investments (Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in one year or less	$ 98,318
Amortized Cost, Due after one year through five years	222,617
Amortized Cost, Due after five years through ten years	59,833
Amortized Cost, Amortized Cost Due after ten years	7,068
Amortized Cost	389,582	$ 288,175
Fair Value, Due in one year or less	98,804
Fair Value, Due after one year through five years	221,341
Fair Value, Due after five years through ten years	59,300
Fair Value, Due after ten years	7,065
Fair Value	388,254	$ 290,073
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,746
Fair Value	$ 1,744