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Investments (Held-to_Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,040 $ 3,857
Gross Unrealized Losses (1) (2)
Fair Value 3,039 3,855
Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 513 1,560
Gross Unrealized Losses (1) (1)
Fair Value 512 1,559
Municipal Bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,527 2,297
Gross Unrealized Losses   (1)
Fair Value $ 2,527 $ 2,296