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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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