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Leases - Other (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Leases    
Operating ROU assets $ 2,300,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment, Net  
Operating lease liabilities $ 2,347,000  
Weighted-average remaining lease term (in years) 9 years 3 months 15 days  
Weighted-average discount rate (as a percent) 4.00%  
Operating lease cost $ 32,000  
Short-term operating lease expense $ 33,000  
Short-term operating lease expense   $ 48,000
Minimum    
Leases    
Remaining lease terms (in years) 1 year  
Maximum    
Leases    
Remaining lease terms (in years) 10 years