GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill, intangible assets and related accumulated amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
GOODWILL AND OTHER INTANGIBLE ASSETS
Goodwill	$ 24,811	$ 24,811
Other intangibles	9,327	9,327
Less accumulated amortization on other intangibles	(8,925)	(8,094)
Other intangible assets, net	402	1,233
Amortization of intangible assets	831	784
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	351
2020	51
Other intangible assets, net	$ 402	$ 1,233