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Leases - Maturities of operating lease liabilities (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Leases  
2020 $ 720
2021 665
2022 612
2023 606
2024 306
Thereafter 69
Total lease payments 2,978
Less: Imputed interest (380)
Total operating lease liabilities $ 2,598