LEASES - Maturities of operating lease liabilities (Details) - USD ($)	Dec. 31, 2019	Jan. 01, 2018
Operating Lease Liabilities Payments Due [Abstract]
One year	$ 10,741,000
Two years	10,316,000
Three years	9,995,000
Four years	10,100,000
Five years	8,402,000
Thereafter	42,730,000
Total undiscounted lease payments	92,284,000
Less: Present value discount	(15,413,000)
Lease Liability	$ 76,871,000	$ 85,100,000