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LOANS AND ALLOWANCE FOR LOAN LOSSES, Acquired With Deteriorated Credit Quality (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Acquired financing receivable recorded investment [Line Items]    
Unpaid principal balance $ 15,626jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance $ 15,952jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
Carrying amount 14,216us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality 14,491us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
Commercial loans [Member]    
Acquired financing receivable recorded investment [Line Items]    
Unpaid principal balance 149jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 150jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Carrying amount 109us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 106us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Real estate mortgage loans [Member]    
Acquired financing receivable recorded investment [Line Items]    
Carrying amount 14,107us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jaxb_RealEstateMortgageLoansMember		 14,385us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= jaxb_RealEstateMortgageLoansMember
Residential real estate loans [Member]    
Acquired financing receivable recorded investment [Line Items]    
Unpaid principal balance 3,416jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 3,625jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Commercial real estate loans [Member]    
Acquired financing receivable recorded investment [Line Items]    
Unpaid principal balance 11,824jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 11,937jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Construction and land real estate loans [Member]    
Acquired financing receivable recorded investment [Line Items]    
Unpaid principal balance 237jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 240jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Consumer and other loans [Member]    
Acquired financing receivable recorded investment [Line Items]    
Unpaid principal balance 0jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0jaxb_FinancingReceivableAcquiredWithDeterioratedCreditQualityUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Carrying amount $ 0us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 $ 0us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember