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LEASES - Right-of-use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease ROU assets $ 8,686 $ 9,222
Operating lease ROU liabilities $ 9,143 $ 9,688
Weighted-average remaining lease term (in years) 16 years 9 months 18 days 17 years 7 months 6 days
Weighted-average discount rate 4.30% 4.50%
Cash paid for operating lease liabilities $ 1,202 $ 1,122
Operating lease expense $ 1,620 $ 1,405