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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
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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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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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