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Income Taxes (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Income Taxes          
Federal corporate income tax rate (as a percent) 19.20% 7.20% 19.10% 11.30%  
Decrease in valuation allowance   $ 46,000      
Pre-tax gain on sale of branch     $ 2,100,000    
Tax at statutory federal income tax rate (as a percent) 21.00%       34.00%
Capital Loss Carryforward          
Income Taxes          
Capital losses   $ 219,000   $ 219,000