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LOANS AND ALLOWANCE FOR LOAN LOSSES, Troubled Debt Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Loan
Mar. 31, 2014
Loan
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]      
Recorded investment $ 8,940us-gaap_FinancingReceivableModificationsRecordedInvestment [1]   $ 10,794us-gaap_FinancingReceivableModificationsRecordedInvestment [1]
Specific reserves allocated 341jaxb_FinancingReceivableModificationsAllocationOfSpecificReserves [2]   372jaxb_FinancingReceivableModificationsAllocationOfSpecificReserves [2]
Recorded investment in loans modified as TDRs, collateral dependent with collateral shortfalls 1,111jaxb_TroubledDebtRestructuringCollateralDependentLoansWithCollateralShortfallsRecordedInvestment   1,285jaxb_TroubledDebtRestructuringCollateralDependentLoansWithCollateralShortfallsRecordedInvestment
Specific reserves on loans modified as TDRs, collateral dependent with collateral shortfalls 341jaxb_FinancingReceivableModificationsAllocationOfSpecificReservesCollateralDependentLoansWithCollateralShortFalls   372jaxb_FinancingReceivableModificationsAllocationOfSpecificReservesCollateralDependentLoansWithCollateralShortFalls
Number of loans 0jaxb_FinancingReceivableModificationsNumberOfContract1 7jaxb_FinancingReceivableModificationsNumberOfContract1  
Pre-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod 3,178jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod  
Post-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod 2,995jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod  
Additional lending amounts committed to customers with loans modified as TDRs 0jaxb_AdditionalOutstandingLoansModifiedAsTdrs   245jaxb_AdditionalOutstandingLoansModifiedAsTdrs
Principal forgiven under troubled debt restructuring modifications   195jaxb_ChargeOffsOnLoansModifiedUnderTdrModification  
Increase in allowance for loan and lease losses due to TDR modification   0jaxb_IncreaseInAllowanceForLoanAndLeaseLossesDueToTdrModification  
Recorded investment of loans that did not meet the definition of a troubled debt restructuring 0jaxb_FinancingReceivableModificationsNotConsideredTroubledDebtRestructuringsRecordedInvestment 2,787jaxb_FinancingReceivableModificationsNotConsideredTroubledDebtRestructuringsRecordedInvestment  
Troubled debt restructuring related to payment default within 12 months 0jaxb_TroubledDebtRestructuringsRelatedToPaymentDefaultWithinTwelveMonths 0jaxb_TroubledDebtRestructuringsRelatedToPaymentDefaultWithinTwelveMonths  
Collateral Impaired Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans   5jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= jaxb_CollateralImpairedLoansMember		  
Commercial loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Pre-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Post-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Residential real estate loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 1jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Pre-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 24jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Post-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 30jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Commercial real estate loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 5jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Pre-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 2,915jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Post-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 2,726jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Construction and land real estate loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		  
Pre-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		  
Post-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		  
Consumer and other loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans 0jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 1jaxb_FinancingReceivableModificationsNumberOfContract1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Pre-Modification Outstanding Recorded Investment 0jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 239jaxb_FinancingReceivableModificationsPreModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Post-Modification Outstanding Recorded Investment $ 0jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 $ 239jaxb_FinancingReceivableModificationsPostModificationRecordedInvestmentPortionAttributableToCurrentPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
[1] Of the total recorded investment in loans modified as TDRs, $1,111 and $1,285, respectively, were for customers whose loans were collateral dependent with collateral shortfalls
[2] Of the specific reserves allocated to customers whose loan terms were modified as TDRs, $341 and $372, respectively, were allocated to customers whose loans were collateral dependent with collateral shortfalls.