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Income Taxes - Summary of components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Income tax expense at federal statutory rate $ 453 $ 431
Current income tax (benefit) expense:    
Federal 89  
State 157 119
Total current tax expense 246 119
Deferred income tax benefits:    
Federal 217 291
State 28 42
Total deferred tax expense 245 333
Income tax expense $ 491 $ 452