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DEFERRED COMPENSATION (Details) - SERP - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
DEFERRED COMPENSATION |  |  |
Period over which SERP benefit payments to be paid |  | 30 years |
Deferred compensation expense | $ 690,000 |  | $ 1,660,000

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