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Deposits (Amounts and scheduled maturities of all certificates of deposit) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Time deposits, $250,000 or more $ 57,400,000 $ 71,300,000
Time Deposits, Fiscal Year Maturity [Abstract]    
Within 1 Year 131,484,617 141,385,500
After 1 Year, Within 2 Years 40,384,177 56,022,488
After 2 Years, Within 3 Years 15,459,977 23,139,815
After 3 Years, Within 4 Years 8,452,948 9,179,894
After 4 Years, Within 5 Years 19,762,977 6,394,059
Time Deposits $ 215,544,696 $ 236,121,756