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Debt (Schedule of Lines of Credit Outstanding) (Details) (Subsidiary of JBGL, Inwood National Bank, USD $)
Dec. 31, 2014
Oct. 13, 2014
Dec. 31, 2013
Oct. 13, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]          
Borrowings on lines of credit $ 14,061,000us-gaap_LineOfCredit   $ 17,208,000us-gaap_LineOfCredit    
Direct Finance Leases A
         
Line of Credit Facility [Line Items]          
Borrowings on lines of credit 662,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
  2,439,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
   
Line of credit, maximum borrowing capacity         4,800,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
Stated interest rate         4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
Direct Finance Leases B
         
Line of Credit Facility [Line Items]          
Borrowings on lines of credit 899,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
  2,269,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
   
Line of credit, maximum borrowing capacity         3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
Stated interest rate         4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
John's Creek
         
Line of Credit Facility [Line Items]          
Borrowings on lines of credit 12,500,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
  12,500,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
   
Line of credit, maximum borrowing capacity       $ 25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
$ 8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
Stated interest rate   4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember