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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale: Amortized Cost
Due in one year or less	$ 7,273	$ 10,737
Due after one through five years	19,424	24,078
Due after five years through ten years	34,165	22,914
Due after ten years	50,947	60,403
Total	111,809	118,132
Available-for-sale: Fair Value
Due in one year or less	7,342	10,781
Due after one through five years	20,322	24,560
Due after five years through ten years	34,898	23,366
Due after ten years	53,028	61,182
Total	$ 115,590	$ 119,889

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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