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LEASES - Summary of Information Related to Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Operating lease ROU assets $ 9,301   $ 9,301   $ 8,686
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets   Other assets   Other assets
Operating lease ROU liabilities $ 9,832   $ 9,832   $ 9,143
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities   Other Liabilities   Other Liabilities
Weighted-average remaining lease term (in years) 16 years   16 years   16 years 9 months 18 days
Weighted-average discount rate 4.20%   4.20%   4.30%
Cash paid for operating lease liabilities $ 331 $ 210 $ 947 $ 847  
Operating lease expense $ 388 $ 421 $ 1,179 $ 1,171