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Leases Maturity of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Due 2019 $ 1,148  
Due 2020 1,541  
Due 2021 1,382  
Due 2022 1,373  
Due 2023 1,015  
Due thereafter 3,063  
Total undiscounted cash flows 9,522  
Discount on cash flows (1,018)  
Total lease liability $ 8,504 $ 0