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Deposits (Schedule of Deposits) (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Statement savings $ 15,413,006 $ 14,536,815
Money market plus 11,126,752 11,749,674
NOW 18,221,556 18,749,026
Certificates of deposit 37,423,363 42,704,679
Deposits $ 82,184,677 $ 87,740,194