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INVESTMENT SECURITIES - Summary of investment securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized cost, as adjusted	$ 84,714	$ 51,409
Gross unrealized holding losses	1,335	164
Estimated fair value	83,379	51,245
Short-term Investments [Member] | Obligations of domestic governmental agencies [Member]
Amortized cost, as adjusted	48,636	15,876
Gross unrealized holding losses	364	4
Estimated fair value	48,272	15,872
Long-term investments [Member] | Obligations of domestic governmental agencies [Member]
Amortized cost, as adjusted	36,078	35,533
Gross unrealized holding losses	971	160
Estimated fair value	$ 35,107	$ 35,373

X

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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