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Investments - Amortized Cost and Estimated Market Value of Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 0 $ 0
Due after one year through five years 0 0
Due after five years through ten years 2,912 3,388
Due after ten years 12,928 10,904
Amortized Cost 15,840 14,292
Estimated Fair Value    
Due in one year or less 0 0
Due after one year through five years 0 0
Due after five years through ten years 2,677 3,202
Due after ten years 11,190 9,526
Estimated fair value $ 13,867 $ 12,728