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Condensed Income Statement (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Other expenses													$ (11,412,259)us-gaap_NoninterestExpense	$ (11,113,244)us-gaap_NoninterestExpense	$ (10,795,319)us-gaap_NoninterestExpense
Income before income tax benefit and equity in undistributed net income of subsidiaries	521us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	637us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	498us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	567us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	814us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,039us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	788us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	607us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	761us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	833us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	805us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	940us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,223,178us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,248,032us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,338,887us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit													308,652us-gaap_IncomeTaxExpenseBenefit	633,855us-gaap_IncomeTaxExpenseBenefit	673,807us-gaap_IncomeTaxExpenseBenefit
Net income	480us-gaap_NetIncomeLoss	526us-gaap_NetIncomeLoss	435us-gaap_NetIncomeLoss	473us-gaap_NetIncomeLoss	650us-gaap_NetIncomeLoss	795us-gaap_NetIncomeLoss	640us-gaap_NetIncomeLoss	529us-gaap_NetIncomeLoss	609us-gaap_NetIncomeLoss	670us-gaap_NetIncomeLoss	656us-gaap_NetIncomeLoss	730us-gaap_NetIncomeLoss	1,914,526us-gaap_NetIncomeLoss	2,614,177us-gaap_NetIncomeLoss	2,665,080us-gaap_NetIncomeLoss
Parent Company
Condensed Income Statements, Captions [Line Items]
Dividends and distributions from subsidiaries													980,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	980,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	980,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses													(77,375)us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(76,005)us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(65,446)us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax benefit and equity in undistributed net income of subsidiaries													902,625us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	903,995us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	914,554us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit													28,136us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	27,970us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	24,084us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in undistributed equity of subsidiaries													983,765glbz_IncreaseDecreaseInInvestmentInEquityMethodInvestment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,682,212glbz_IncreaseDecreaseInInvestmentInEquityMethodInvestment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,726,441glbz_IncreaseDecreaseInInvestmentInEquityMethodInvestment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income													$ 1,914,526us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 2,614,177us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 2,665,080us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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