SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	176,600	122,300	121,300
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	34.00%
Adjustments to Deferred Tax Assets For Change In Effective Tax Rate			$ 2,600,000
Operating Lease, Liability	$ 8,175,000
Operating Lease, Right-of-Use Asset	$ 8,596,000	$ 0
Accounting Standards Update 2016-02 [Member]
Accounting Policies [Line Items]
Operating Lease, Liability				$ 9,013,900
Operating Lease, Right-of-Use Asset				$ 9,013,900
Building [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	40 years
Furniture and Fixtures [Member] | Maximum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Furniture and Fixtures [Member] | Minimum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years