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Securities - (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Securities pledged as collateral $ 21,121,613us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments $ 20,420,437us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments
Securities sold under agreements to repurchase 9,165,462us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 9,541,242us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Gross realized gains on sales of available-for-sale securities 429,105us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 907,908us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses on sales of available-for-sale securities (20,352)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (10,007)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Reclassification adjustment for realized gains (losses) included in net income, taxes 138,976us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 305,286us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Debt securities, fair value $ 40,587,408us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue $ 71,198,051us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Percentage of available-for-sale investment portfolio 42.00%jxsb_PercentageOfAvailableForSaleSecuritiesDebtSecurities 65.00%jxsb_PercentageOfAvailableForSaleSecuritiesDebtSecurities