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Income Taxes (Schedule of Components of the Provision for Federal Income Taxes) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Current   $ 2,529,000 $ 3,822,000
Change in corporate tax rate $ 3,060,000   3,060,000
Deferred   24,000 (331,000)
Income Tax Expense (Benefit), Total   $ 2,553,000 $ 6,551,000