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LEASES - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Lessee Lease Description [Line Items]            
Operating lease right-of-use assets $ 7,900,000 $ 10,810,000   $ 10,810,000   $ 12,132,000
Operating lease liabilities $ 8,200,000 $ 11,116,000   $ 11,116,000   $ 12,423,000
Weighted average discount rate   3.09%   3.09%   3.05%
Weighted average lease term   6 years 1 month 9 days   6 years 1 month 9 days   6 years 3 months 29 days
Operating lease costs   $ 812,000 $ 757,000 $ 1,600,000 $ 1,400,000  
Variable lease costs   $ 87,000 $ 82,000 $ 176,000 $ 155,000  
Minimum [Member]            
Lessee Lease Description [Line Items]            
Remaining lease term       6 months   5 months
Maximum [Member]            
Lessee Lease Description [Line Items]            
Remaining lease term       17 years   17 years
ASU 842 [Member]            
Lessee Lease Description [Line Items]            
Change in Accounting Principle, Accounting Standards Update, Adoption Date Feb. 29, 2016 Jan. 01, 2019   Jan. 01, 2019    
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true true   true    
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List] us-gaap:AccountingStandardsUpdate201811Member     us-gaap:AccountingStandardsUpdate201602RetrospectiveMember