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Investments (Amortized Cost and Fair Values of HTM Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Held-to-maturity, Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 866  
Due after five years through ten years 425  
Due after ten years 0  
HTM debt securities 1,291 $ 1,297
Held-to-maturity, Fair Value    
Due in one year or less 0  
Due after one year through five years 920  
Due after five years through ten years 460  
Due after ten years 0  
Debt Securities, Held-to-maturity, Fair Value $ 1,380 $ 1,411