INVESTMENT SECURITIES - Contractual maturities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Held to Maturity, Amortized Cost
Due in one year or less	$ 0
Due after one year through five years	26
Due after five years through ten years	3
Due after ten years	0
Total, Amortized Cost	29
Held to Maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	27
Due after five years through ten years	3
Due after ten years	0
Total, Estimated Fair Value	$ 30

Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date.

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