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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
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DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Cash pledged | $ 1,630,000 | $ 710,000 |
Securities pledged | $ 15,490,000 | $ 8,713,000 |
Interest rate swap | Cash flow hedge | Variable-rate borrowings |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Notional amount |  |  | $ 10,000,000

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