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LEASES - Summary of Information Related to Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Operating lease ROU assets $ 9,557   $ 9,557   $ 8,686
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets   Other assets   Other assets
Operating lease ROU liabilities $ 10,060   $ 10,060   $ 9,143
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities   us-gaap:OtherLiabilities   us-gaap:OtherLiabilities
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 $ 318 $ 319 $ 616 $ 637  
Operating lease expense $ 388 $ 370 $ 791 $ 750