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Leases - Other (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases    
Operating right-of-use assets $ 2,100,000  
Operating lease liabilities $ 2,137,000 $ 2,224,000
Weighted-average remaining lease term (in years) 7 years 3 months 18 days  
Weighted-average discount rate (as a percent) 4.00%  
Operating lease cost $ 348,000 288,000
Short-term operating lease expense $ 108,000 $ 163,000
Minimum    
Leases    
Remaining lease terms (in years) 1 year  
Maximum    
Leases    
Remaining lease terms (in years) 10 years