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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, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |
Gross gains on sales of available for sale securities | $ 716 | $ 1,508 | $ 716
Gross losses on sales of available for sale securities | (559) | (22) | (559)
Net gains on sale of available for sale securities | $ 157 | $ 1,486 | $ 157

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