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Short-term Borrowings (Detail Textuals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Securities sold under agreements to repurchase $ 9,165,462us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 9,541,242us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Short-term Debt    
Short-term Debt [Line Items]    
Securities sold under agreements to repurchase 8,821,730us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
8,810,297us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
Federal Home Loan Bank advances, maturity year 2015  
Interest on FHLB advances 0.33%jxsb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
 
Maximum | Short-term Debt    
Short-term Debt [Line Items]    
Securities sold under agreements to repurchase 9,483,795us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
9,445,747us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Monthly Average | Short-term Debt    
Short-term Debt [Line Items]    
Securities sold under agreements to repurchase 6,229,604us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
6,208,142us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Overnight Advance | Short-term Debt    
Short-term Debt [Line Items]    
Advances from Federal Home Loan Banks 5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= jxsb_OvernightAdvanceMember
10,800,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= jxsb_OvernightAdvanceMember
Secured by Mortgage Loan | Short-term Debt    
Short-term Debt [Line Items]    
Advances from Federal Home Loan Banks $ 42,384,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ShortTermDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= jxsb_SecuredMortgageLoanPayableMember