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LEASES - Assets and liabilities (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]      
Operating lease right-of-use assets   $ 9,488 $ 10,338
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   Other Asset Other Asset
Operating lease liabilities   $ 9,841 $ 10,627
Operating Lease, Liability, Statement of Financial Position [Extensible List]   Other Liabilities Other Liabilities
Lease, Practical Expedients, Package [true false] true