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INVESTMENT SECURITIES - Summary of investment securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized cost, as adjusted $ 71,778 $ 51,409
Gross unrealized holding losses 1,482 164
Estimated fair value 70,296 51,245
Short-term Investments [Member] | Obligations of domestic governmental agencies [Member]    
Amortized cost, as adjusted 59,374 15,876
Gross unrealized holding losses 1,053 4
Estimated fair value 58,321 15,872
Long-term investments [Member] | Obligations of domestic governmental agencies [Member]    
Amortized cost, as adjusted 12,404 35,533
Gross unrealized holding losses 429 160
Estimated fair value $ 11,975 $ 35,373