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Commitments and Contingent Liabilities - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingent Liabilities      
Rent expense - operating leases $ 1,460 $ 1,530 $ 1,410
Minimum lease payments that were executed prior to December 31, 2018 3,210    
Operating lease commitments      
2019 1,503    
2020 1,434    
2021 830    
2022 327    
2023 227    
Thereafter 2,216    
Operating Leases, Future Minimum Payments Due, Total $ 6,537