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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Provision of Income Taxes      
Federal statutory rate (as a percent)   34.00% 34.00%
Federal statutory rate times financial statement net income   $ 1,269 $ 427
State taxes, net of federal benefit   268 91
Change in federal rate   519  
Earnings from bank owned life insurance   (22) (24)
Low income housing credits   (212) (212)
Change in valuation allowance     (2,527)
Other, net   41 20
Total   1,863 $ (2,225)
Decrease in deferred tax assets   519  
Increase to deferred income tax expense   $ 519  
Maximum      
Reconciliation of Provision of Income Taxes      
Federal statutory rate (as a percent)   35.00%  
Forecast      
Reconciliation of Provision of Income Taxes      
Federal statutory rate (as a percent) 21.00%