DEBT - Notes Payable (Details) - Notes Payable	Dec. 31, 2020 USD ($)
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

Amount, after accumulated amortization, of debt discount (premium).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant