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Loan Servicing - (Detail Textuals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Transfers and Servicing [Abstract]      
Unpaid principal balance of mortgage loans serviced for others $ 137,877,795jxsb_UnpaidPrincipalBalanceOfLoansServicedForOthers $ 145,883,259jxsb_UnpaidPrincipalBalanceOfLoansServicedForOthers  
Capitalized mortgage servicing rights, valuation allowance $ 56,969us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance $ 73,392us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance $ 428,030us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance