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Commitments and Contingencies - Summary of outstanding loan commitments, unused lines of credit and letters of credit (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loan commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	$ 1,666,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember	$ 4,378,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember	$ 7,047,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember
Construction and land development
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability		1,561,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_ConstructionAndLandDevelopmentMember	822,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_ConstructionAndLandDevelopmentMember
Other mortgage loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	1,666,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_OtherMortgageLoansMember	2,817,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_OtherMortgageLoansMember	6,225,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_OtherMortgageLoansMember
Unused lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	19,706,092us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember	19,490,826us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember	19,188,516us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Home-equity lines
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	3,825,462us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditHomeEquityMember	11,067,236us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditHomeEquityMember	9,882,497us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditHomeEquityMember
Commercial lines
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	15,156,201us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditCommercialMember	7,726,424us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditCommercialMember	8,615,844us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditCommercialMember
Secured consumer line
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	50,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditConsumerSecuredMember	24,043us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditConsumerSecuredMember	3,002us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditConsumerSecuredMember
Unsecured consumer lines
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	674,429us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditConsumerUnsecuredMember	673,123us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditConsumerUnsecuredMember	687,173us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = glbz_LineOfCreditConsumerUnsecuredMember
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value disclosure, off-balance sheet risks, face amount, liability	$ 57,580us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_LetterOfCreditMember	$ 32,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_LetterOfCreditMember	$ 32,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_LetterOfCreditMember

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