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Changes in Accumulated Other Comprehensive Income (AOCI) by Component (Tables)
12 Months Ended
Dec. 31, 2016
Changes In Accumulated Other Comprehensive Income Aoci By Component [Abstract]  
Schedule of reclassified from AOCI and the affected line items in the statements of income
    Amounts Reclassified
from AOCI
    Affected Line Item in the
    2016     2015     Statements of Income
                 
Realized gains on available-for-sale securities   $ 399,599     $ 320,585     Realized gain on sale of securities
                    Total reclassified amount before tax
      (135,864 )     (108,999 )   Tax expense
                     
    $ 263,735     $ 211,586     Net reclassified amount