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INVESTMENT SECURITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
INVESTMENT SECURITIES |  |  |  |  |
Available-for-sale Securities, Gross Realized Gains | $ 0 | $ 78,000 | $ 0 | $ 78,000 |
Securities classified as held to maturity | 0 |  | 0 |  | $ 0
Fair Value of Debt Securities Reported Less Than Their Historical Cost | $ 93,100,000 |  | $ 93,100,000 |  | $ 24,200,000
Debt Securities Reported Less Than Their Historical Cost Percent of Investment Portfolio | 20.70% |  | 20.70% |  | 5.80%
Unrealized gains on available-for-sale securities reclassified out of AOCI | $ 0 | $ 0 | $ 0 | $ 0 |

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