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Income Taxes (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]    
Retained earnings for which no deferred federal income tax liability has been recognized $ 2,600,000jxsb_RetainedEarningsForWhichNoDeferredFederalIncomeTaxLiabilityHasBeenRecognized 2,600,000jxsb_RetainedEarningsForWhichNoDeferredFederalIncomeTaxLiabilityHasBeenRecognized
Deferred income tax liabilities that would have been recorded if they were expected to reverse into taxable income in the foreseeable future 1,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Illinois    
Income Taxes [Line Items]    
Operating loss carry forwards $ 98,574us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= jxsb_IllinoisMember
3,870,846us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= jxsb_IllinoisMember
Operating loss carryforwards limitations Recent Illinois legislation limited the use of these loss carryovers for tax years 2011 through 2013 and the expiration dates were extended by three years. Management believes the Company will produce taxable earnings in the future which will enable the net operating loss carryforwards to be utilized prior to expiration.  
Illinois | Minimum    
Income Taxes [Line Items]    
Operating loss carryforwards expiration year 2018  
Illinois | Maximum    
Income Taxes [Line Items]    
Operating loss carryforwards expiration year   2022