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Loans and Allowance for Loan Losses (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan participations outstanding balance $ 14,064,902jxsb_LoanParticipationsOutstandingBalance $ 14,210,231jxsb_LoanParticipationsOutstandingBalance
Loan participations purchased during period 2,677,750jxsb_LoanParticipationsPurchasedDuringPeriod 3,877,762jxsb_LoanParticipationsPurchasedDuringPeriod
Loan commitments funded Period 45 days  
Annual loan review for watch list credits 75,000jxsb_AnnualLoanReviewForWatchListCredits  
One-to-four family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructurings, recorded investment 201,879us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
522,819us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
Troubled debt restructurings, number of modifications 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
8us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
TDR's defaulted as they were more than 90 days past due   206,299us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
Troubled debt restructurings, subsequent default, number of modifications   4us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
Number of loans restructured with reduced interest rate and accrued interest capitalized   3jxsb_NumberOfLoansRestructuredWithReducedInterestRateAndAccruedInterestCapitalized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
Principal write-off   35,871jxsb_AmountOfPrincipalWriteOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
One-to-four family residential | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of total applicant's monthly mortgage payment total monthly income 30.00%jxsb_MonthlyMortgagePaymentToMonthlyIncomePercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Percentage of applicant's total monthly obligations to total monthly income 43.00%jxsb_MonthlyObligationsToMonthlyIncomePercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
One-to-four family residential | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Origination of loan for resale to secondary market fixed rate period 15 years  
Loan to value ratios 80.00%jxsb_SecuredRealEstateToLoanPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
One-to-four family residential | Adjustable rate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans maturity term 30 years  
Interest rate adjustments per year, maximum 2.00%us-gaap_MortgageLoansOnRealEstateMaximumInterestRateInRange
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
 
Interest rate adjustments cap on interest rate increases over the life of the loan 6.00%jxsb_AdjustableRateMortgageWeightedAverageLifetimeInterestRateCap
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_OneToFourFamilyMember
 
One-to-four family residential | Adjustable rate loans | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans adjustment term 5 years  
One-to-four family residential | Adjustable rate loans | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans adjustment term 1 year  
Commercial Real Estate Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructurings, recorded investment 386,355us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
175,649us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
Troubled debt restructurings, number of modifications 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
TDR's defaulted as they were more than 90 days past due 840,115us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
61,980us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
Troubled debt restructurings, subsequent default, number of modifications 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateLoanMember
Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans maturity term 10 years  
Loan to value ratios 95.00%jxsb_LoanToAppraisedValuePercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
 
TDR's defaulted as they were more than 90 days past due 3,305us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
7,558us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Troubled debt restructurings, subsequent default, number of modifications 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Consumer loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans maturity term 10 years  
Loan to value ratios 95.00%jxsb_LoanToAppraisedValuePercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
 
Troubled debt restructurings, recorded investment 15,953us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
27,593us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Troubled debt restructurings, number of modifications 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
TDR's defaulted as they were more than 90 days past due 25,055us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
27,593us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Troubled debt restructurings, subsequent default, number of modifications 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Residential Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructurings, recorded investment 140,549us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
 
Troubled debt restructurings, number of modifications 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
 
TDR's defaulted as they were more than 90 days past due 38,737us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
70,880us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Troubled debt restructurings, subsequent default, number of modifications 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Commercial Real Estate and Commercial Loans | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan amount that requires risk rating verification 750,000jxsb_LoanAmountThatRequiresRiskRatingVerification
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialRealEstateAndCommercialLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Commercial and Agricultural Real Estate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Minimum ratio of property's projected net cash flow to loan's debt service requirement 120.00%jxsb_ProjectedCashFlowsToLoansDebtServiceRequirementPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialFinancialAndAgriculturalPortfolioSegmentMember
 
Loan value that requires written appraisals from licensed or certified appraisers 250,000jxsb_LoanValueThatRequiresWrittenAppraisalsFromLicensedOrCertifiedAppraisers
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialFinancialAndAgriculturalPortfolioSegmentMember
 
Loan to value ratios 75.00%jxsb_LoanToAppraisedValuePercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jxsb_CommercialFinancialAndAgriculturalPortfolioSegmentMember
 
Commercial business    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructurings, recorded investment   40,644us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Troubled debt restructurings, number of modifications   1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
TDR's defaulted as they were more than 90 days past due 22,437us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
37,939us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Troubled debt restructurings, subsequent default, number of modifications 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Automobile loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loan term 60 months  
Automobile loan | Purchase price    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan to value ratio 80.00%jxsb_LoanToValueRatio
/ jxsb_AutomobileLoanOriginatedCriteriaAxis
= jxsb_PurchasePriceMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_AutomobileLoanMember
 
Automobile loan | Nada Book Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan to value ratio 100.00%jxsb_LoanToValueRatio
/ jxsb_AutomobileLoanOriginatedCriteriaAxis
= jxsb_NadaBookValueMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_AutomobileLoanMember
 
Officer | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lending authority amount 750,000jxsb_LendingLimit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
 
Director | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lending authority amount 1,000,000jxsb_LendingLimit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
 
Board of Directors | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lending authority amount $ 1,000,000jxsb_LendingLimit
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember