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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Operating Lease Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 $ 929    
2020 902    
2021 900    
2022 916    
2023 905    
2024 and thereafter 6,754    
Total 11,306    
Rent expense $ 1,100 $ 872 $ 352