| DEBT - Notes Payable (Details) - Notes Payable | Dec. 31, 2020  USD ($) | 
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| Debt Instrument | |
| Debt face amount | $ 40,000,000.0 | 
| Debt instrument premium | 300,000 | 
| Fixed-rate 3.47% Note Payable due on February 20, 2021 | |
| Debt Instrument | |
| Debt face amount | 20,000,000.0 | 
| Fixed-rate 3.59% Note Payable due on February 20, 2022 | |
| Debt Instrument | |
| Debt face amount | $ 20,000,000.0 | 
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount, after accumulated amortization, of debt discount (premium). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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