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Loan Servicing - Mortgage servicing rights measured using Amortization Method with Aggregate activity in related valuation allowances (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Valuation allowances      
Balance at beginning of year     $ 428,030us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Balances at end of year 56,969us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance 73,392us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance 428,030us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Mortgage servicing assets, net 632,634jxsb_MortgageServicingRights 673,576jxsb_MortgageServicingRights  
Mortgage servicing rights      
Mortgage servicing rights      
Balance, beginning of year 746,968us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
793,715us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Additions 53,859us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
101,538us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Amortization (111,224)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
(148,285)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Balance at end of year 689,603us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
746,968us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Valuation allowances      
Balance at beginning of year 73,392us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
129,279us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Additions due to decreases in market value        
Reduction due to increases in market value    (33,649)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsRecoveries
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Reduction due to payoff of loans (16,423)jxsb_ValuationAllowancesAndReservesDeductionsDueToPayoffOfLoans
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
(22,238)jxsb_ValuationAllowancesAndReservesDeductionsDueToPayoffOfLoans
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Balances at end of year 56,969us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
73,392us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Mortgage servicing assets, net 632,634jxsb_MortgageServicingRights
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
673,576jxsb_MortgageServicingRights
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Fair value disclosures      
Fair value as of the beginning of the period 1,120,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
765,029us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
 
Fair value as of the end of the period $ 979,699us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember
$ 1,120,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= jxsb_MortgageServicingRightsMember