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LEASES - Assets and liabilities (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Jun. 30, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease right-of-use assets   $ 9,866 $ 9,623
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   Other Assets  
Operating lease liabilities   $ 9,968 $ 9,651
Operating Lease, Liability, Statement of Financial Position [Extensible List]   Other Liabilities  
Lease, Practical Expedients, Package [true false] true