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SECURITIES AVAILABLE FOR SALE - Gains and Losses from AFS Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
SECURITIES AVAILABLE FOR SALE |  |  |
Gross gains on sales of available for sale securities | $ 1,980 | $ 2,030 | $ 1,508
Gross losses on sales of available for sale securities | (50) | (50) | (22)
Net gains on sale of available for sale securities | $ 1,930 | $ 1,980 | $ 1,486

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