LEASES - Leases Balance Sheets Location (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
LEASES
Operating lease right-of-use asset	$ 12,229	$ 12,900
Financial position	us-gaap:OtherAssets
Operating lease liability	$ 15,833	$ 16,600
Financial position	us-gaap:OtherLiabilities
Weighted-average remaining lease terms - Operating leases	5 years 5 months 12 days
Weighted-average discount rate - Operating leases	3.69%