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LEASES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Lessee Lease Description [Line Items]    
Operating lease right-of-use assets $ 7,541 $ 7,900
Operating lease liabilities $ 7,683 $ 8,200
Weighted average discount rate 3.20%  
Weighted average lease term 3 years 11 months 8 days  
Lease cost $ 624  
Variable lease costs $ 73  
Minimum [Member]    
Lessee Lease Description [Line Items]    
Remaining lease term 1 year  
Maximum [Member]    
Lessee Lease Description [Line Items]    
Remaining lease term 7 years