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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Income Taxes      
Federal corporate income tax rate (as a percent) 18.90% 16.40%  
Pre-tax gain on sale of branch $ 2,074,000 $ 0  
Tax at statutory federal income tax rate (as a percent) 21.00%   34.00%
Capital Loss Carryforward      
Income Taxes      
Valuation reserve   46,000  
Capital losses   $ 219,000