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Income Taxes - Components of net deferred income tax benefits (Detail 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax benefits:
Accrued deferred compensation	$ 142,308us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	$ 129,101us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	$ 120,695us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Impairment loss on investment securities	1,305,584us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	1,218,497us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	1,212,351us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Allowance for credit losses	364,697us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	458,303us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	816,722us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Nonaccrual interest	445,173glbz_DeferredTaxAssetsNonaccrualInterest	339,765glbz_DeferredTaxAssetsNonaccrualInterest	283,045glbz_DeferredTaxAssetsNonaccrualInterest
Alternative minimum tax credits	615,186us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	485,444us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	306,523us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Accumulated depreciation	72,354glbz_DeferredTaxAssetsAccumulatedDepreciation	60,627glbz_DeferredTaxAssetsAccumulatedDepreciation	75,650glbz_DeferredTaxAssetsAccumulatedDepreciation
Other real estate owned	14,940glbz_DeferredTaxAssetsOtherRealEstateOwned	14,940glbz_DeferredTaxAssetsOtherRealEstateOwned
Reserve for unfunded commitments	78,890glbz_DeferredTaxAssetsReserveForUnfundedCommitments	78,890glbz_DeferredTaxAssetsReserveForUnfundedCommitments	78,890glbz_DeferredTaxAssetsReserveForUnfundedCommitments
Other temporary differences	2,116us-gaap_DeferredTaxAssetsOther	1,332us-gaap_DeferredTaxAssetsOther
Accumulated securities premium accretion	71,834glbz_DeferredTaxAssetsAccumulatedSecuritiesPremiumAccretion	39,514glbz_DeferredTaxAssetsAccumulatedSecuritiesPremiumAccretion
Net unrealized depreciation on investment securities available for sale		778,048us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Total deferred income tax benefits	3,113,082us-gaap_DeferredTaxAssetsGross	3,604,461us-gaap_DeferredTaxAssetsGross	2,893,876us-gaap_DeferredTaxAssetsGross
Deferred income tax liabilities:
Accumulated securities discount accretion			32,209glbz_DeferredTaxLiabilitiesAccumulatedSecuritiesDiscountAccretion
Net unrealized appreciation on investment securities available for sale	67,847us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities		1,626,412us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Total deferred income tax liabilities	67,847us-gaap_DeferredIncomeTaxLiabilities		1,658,621us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax benefits	$ 3,045,235us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 3,604,461us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 1,235,255us-gaap_DeferredTaxAssetsLiabilitiesNet

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