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Leases - Maturities of Operating Lease Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Undiscounted Future Operating Lease Payments after Adoption of ASC 842      
Operating lease payments, Year one $ 379    
Operating lease payments, Year two 299    
Operating lease payments, Year three 284    
Operating lease payments, Year four 264    
Operating lease payments, Year five 269    
Thereafter 11,747    
Total undiscounted lease payments 13,242    
Less imputed interest (9,912)    
Lease liability $ 3,330 $ 3,837 $ 4,074