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Restricted Investment in Bank Stock (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restricted Investment in Bank Stock [Abstract]        
Cash Dividends $ 69,376 $ 59,270 $ 135,343 $ 126,489