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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease expense [1] $ 209 $ 212 $ 627 $ 635
Operating lease income [2] 208 $ 206 619 630
Operating lease, right-of-use asset 2,657   2,657  
Operating lease, liability $ 2,726   $ 2,726  
Weighted-average remaining lease term (in years) 5 years 2 months 1 day   5 years 2 months 1 day  
Weighted-average discount rate 3.04%   3.04%  
Operating cash flows from operating leases     $ 523 $ 552
[1] Includes short-term lease costs. For the three- and nine-month periods ended September 30, 2021 and 2020, short-term lease costs were nominal in amount.
[2] Operating lease income includes rental income from owned properties.