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Commitments and Credit Risk (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Outstanding commitments to originate loans    
Commitments and Contingencies Disclosure [Line Items]    
Commitments and credit risk 3,493,500us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoanOriginationCommitmentsMember
$ 9,242,300us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoanOriginationCommitmentsMember
Outstanding commitments to originate loans | Fixed Income Interest Rate    
Commitments and Contingencies Disclosure [Line Items]    
Commitments and credit risk 2,702,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoanOriginationCommitmentsMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
4,676,300us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoanOriginationCommitmentsMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
Outstanding commitments to originate loans | Fixed Income Interest Rate | Minimum    
Commitments and Contingencies Disclosure [Line Items]    
Loan commitments, fixed rate of interest 2.88%jxsb_LoansAndLeasesReceivableCommitmentsFixedInterestRates
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoanOriginationCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
 
Outstanding commitments to originate loans | Fixed Income Interest Rate | Maximum    
Commitments and Contingencies Disclosure [Line Items]    
Loan commitments, fixed rate of interest 8.00%jxsb_LoansAndLeasesReceivableCommitmentsFixedInterestRates
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoanOriginationCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
 
Standby Letters of Credit    
Commitments and Contingencies Disclosure [Line Items]    
Commitments and credit risk 255,340us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_StandbyLettersOfCreditMember
360,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_StandbyLettersOfCreditMember
Unused lines of Credit | Commercial lines    
Commitments and Contingencies Disclosure [Line Items]    
Commitments and credit risk 21,498,070us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnusedLinesOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
22,038,305us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnusedLinesOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
Unused lines of Credit | Open-ended consumer lines    
Commitments and Contingencies Disclosure [Line Items]    
Commitments and credit risk 9,742,393us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnusedLinesOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= jxsb_ConsumerMember
$ 10,413,745us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnusedLinesOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= jxsb_ConsumerMember