LEASES - Supplemental Cash Flow and Balance Sheet Information (Details) - USD ($)		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		$ 309,000
Operating cash flows from finance leases		17,000
Financing cash flows from finance leases		26,000	$ 0
Right-of-use assets obtained in exchange for lease obligations:
Operating leases		11,885,000
Finance leases		$ 1,612,000
Weighted average remaining lease term (years):
Operating leases		15 years 6 months
Finance leases		22 years 8 months 12 days
Weighted average discount rate:
Operating leases		3.69%
Finance leases		3.94%
ASU 2016-02
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 10,500,000
Finance leases	$ 1,600,000