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Deposits - Summary of interest expense on deposits (Details 1) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deposits [Abstract]      
NOW and SuperNOW $ 8,801 $ 9,711 $ 11,608
Money Market 9,462 12,763 9,965
Savings 44,866 39,936 37,537
Certificates of Deposit, $100,000 or more 455,781 522,637 523,472
Other time deposits 962,222 1,165,027 1,310,732
Interest expense $ 1,481,132 $ 1,750,074 $ 1,893,314