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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Operating lease expense [1] $ 209 $ 211
Operating lease income [2] 209 212
Operating lease right-of-use assets $ 2,913  
Operating Lease Liability Statement Of Financial Position Extensible List fusb:OperatingLeasesLiabilitiesMember  
Operating lease liability $ 2,973  
Weighted-average remaining lease term (in years) 5 years 8 months 26 days  
Weighted-average discount rate 3.08%  
Operating cash flows from operating leases $ 176 $ 188
[1] Includes short-term lease costs. For the three-month periods ended March 31, 2021 and 2020, short-term lease costs were nominal in amount.
[2] Operating lease income includes rental income from owned properties.