INVESTMENTS - (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Available-for-sale Securities, Debt maturities, Amortized cost:
One year or less	$ 27,550
Over one through five years	85,585
Over five through ten years	118,136
Over ten years	93,590
Amortized cost	324,861
Available-for-sale Securities, Debt maturities, Fair value:
One year or less	28,094
Over one through five years	86,559
Over five through ten years	118,352
Over ten years	94,527
Amortized cost	$ 327,532

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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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 second through fifth 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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