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LEASES - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets | $ 7,900,000 | $ 10,810,000 |  | $ 10,810,000 |  | $ 12,132,000
Operating lease liabilities | $ 8,200,000 | $ 11,116,000 |  | $ 11,116,000 |  | $ 12,423,000
Weighted average discount rate |  | 3.09% |  | 3.09% |  | 3.05%
Weighted average lease term |  | 6 years 1 month 9 days |  | 6 years 1 month 9 days |  | 6 years 3 months 29 days
Operating lease costs |  | $ 812,000 | $ 757,000 | $ 1,600,000 | $ 1,400,000 |
Variable lease costs |  | $ 87,000 | $ 82,000 | $ 176,000 | $ 155,000 |
Minimum [Member] |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Remaining lease term |  |  |  | 6 months |  | 5 months
Maximum [Member] |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Remaining lease term |  |  |  | 17 years |  | 17 years
ASU 842 [Member] |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Feb. 29, 2016 | Jan. 01, 2019 |  | Jan. 01, 2019 |  |
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