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Fair Value Measurements - Summary of fair value measurements on recurring and non-recurring Basis (Detail 1) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Recurring:      
Securities available for sale $ 74,313,682us-gaap_AvailableForSaleSecurities $ 87,993,145us-gaap_AvailableForSaleSecurities $ 100,490,267us-gaap_AvailableForSaleSecurities
Non-recurring:      
Maryland Financial Bank stock 30,000glbz_MarylandFinancialBankStock 30,000glbz_MarylandFinancialBankStock 30,000glbz_MarylandFinancialBankStock
Securities available for sale:      
OTTI on investments 15,581us-gaap_ImpairmentOfInvestments    
Fair Value, Inputs, Level 1      
Securities available for sale:      
Purchases of securities       
Sales, calls, and maturities of securities       
Net amortization/accretion of premium/discount       
Increase (decrease) in market value 216,944glbz_AvailableForSalesSecuritiesIncreaseDecreaseInMarketValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
OTTI on investments       
Transfer to level 1       
Transfer to level 2       
Maryland Financial Bank stock OTTI on stock       
Impaired loans:      
Payments and other loan reductions       
Change in total provision       
Loans converted to OREO       
OREO:      
OREO converted from loans       
Sales of OREO       
Write-down of OREO       
Loss on disposal of OREO       
Fair Value, Inputs, Level 2      
Securities available for sale:      
Purchases of securities 50,167,691glbz_SecuritiesAvailableForSalePurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Sales, calls, and maturities of securities (38,223,651)glbz_SalesCallAndMaturitiesOfSecuritiesAvailableForSales
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Net amortization/accretion of premium/discount (391,144)glbz_AvailableForSalesDebtSecuritiesAmortizationAccretionOfPremiumDiscount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Increase (decrease) in market value 1,746,303glbz_AvailableForSalesSecuritiesIncreaseDecreaseInMarketValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
OTTI on investments       
Transfer to level 1       
Transfer to level 2       
Maryland Financial Bank stock OTTI on stock       
Impaired loans:      
Payments and other loan reductions       
Change in total provision       
Loans converted to OREO       
OREO:      
OREO converted from loans 45,175us-gaap_RealEstateOtherAcquisitions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Sales of OREO (1,153,883)us-gaap_RealEstateCostOfRealEstateSold
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Write-down of OREO (16,448)us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Loss on disposal of OREO (442)us-gaap_GainsLossesOnSalesOfOtherRealEstate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Fair Value, Inputs, Level 3      
Securities available for sale:      
Purchases of securities       
Sales, calls, and maturities of securities       
Net amortization/accretion of premium/discount (134)glbz_AvailableForSalesDebtSecuritiesAmortizationAccretionOfPremiumDiscount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Increase (decrease) in market value 163,454glbz_AvailableForSalesSecuritiesIncreaseDecreaseInMarketValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
OTTI on investments       
Transfer to level 1       
Transfer to level 2       
Maryland Financial Bank stock OTTI on stock       
Impaired loans:      
Payments and other loan reductions (5,874,910)glbz_ImpairedFinancingReceivablePaymentAndOtherReduction
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Change in total provision 452,709us-gaap_FinancingReceivableAllowanceForCreditLossesEffectOfChangeInMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Loans converted to OREO (45,175)us-gaap_TransferToOtherRealEstate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
OREO:      
OREO converted from loans       
Sales of OREO       
Write-down of OREO       
Loss on disposal of OREO       
Fair Value      
Securities available for sale:      
Purchases of securities 50,167,691glbz_SecuritiesAvailableForSalePurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Sales, calls, and maturities of securities (38,223,651)glbz_SalesCallAndMaturitiesOfSecuritiesAvailableForSales
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Net amortization/accretion of premium/discount (391,278)glbz_AvailableForSalesDebtSecuritiesAmortizationAccretionOfPremiumDiscount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Increase (decrease) in market value 2,126,701glbz_AvailableForSalesSecuritiesIncreaseDecreaseInMarketValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
OTTI on investments       
Transfer to level 1       
Transfer to level 2       
Maryland Financial Bank stock OTTI on stock       
Impaired loans:      
New impaired loans 5,897,664us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Payments and other loan reductions (5,874,910)glbz_ImpairedFinancingReceivablePaymentAndOtherReduction
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Change in total provision 452,709us-gaap_FinancingReceivableAllowanceForCreditLossesEffectOfChangeInMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Loans converted to OREO (45,175)us-gaap_TransferToOtherRealEstate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
OREO:      
OREO converted from loans 45,175us-gaap_RealEstateOtherAcquisitions
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Sales of OREO (1,153,883)us-gaap_RealEstateCostOfRealEstateSold
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Write-down of OREO (16,448)us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Loss on disposal of OREO (442)us-gaap_GainsLossesOnSalesOfOtherRealEstate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Recurring | Fair Value, Inputs, Level 1      
Recurring:      
Securities available for sale 573,600us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
790,544us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Recurring | Fair Value, Inputs, Level 2      
Recurring:      
Securities available for sale 73,515,807us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
86,815,006us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Recurring | Fair Value, Inputs, Level 3      
Recurring:      
Securities available for sale 224,275us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
387,595us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Recurring | Fair Value      
Recurring:      
Securities available for sale 74,313,682us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
87,993,145us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Nonrecurring | Fair Value, Inputs, Level 1      
Non-recurring:      
Maryland Financial Bank stock        
Impaired loans        
OREO        
Assets, fair value disclosure 573,600us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
    
Nonrecurring | Fair Value, Inputs, Level 2      
Non-recurring:      
Maryland Financial Bank stock        
Impaired loans        
OREO 1,170,773glbz_OtherRealEstateOwnFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
45,175glbz_OtherRealEstateOwnFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Assets, fair value disclosure 74,686,580us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
86,860,181us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Nonrecurring | Fair Value, Inputs, Level 3      
Non-recurring:      
Maryland Financial Bank stock 30,000glbz_MarylandFinancialBankStock
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
30,000glbz_MarylandFinancialBankStock
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Impaired loans 4,745,229glbz_LoansAndLeasesReceivableImpairedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
5,175,517glbz_LoansAndLeasesReceivableImpairedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
OREO        
Assets, fair value disclosure 4,999,504us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
5,593,112us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Nonrecurring | Fair Value      
Non-recurring:      
Maryland Financial Bank stock 30,000glbz_MarylandFinancialBankStock
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
30,000glbz_MarylandFinancialBankStock
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Impaired loans 4,745,229glbz_LoansAndLeasesReceivableImpairedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
5,175,517glbz_LoansAndLeasesReceivableImpairedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
OREO 1,170,773glbz_OtherRealEstateOwnFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
45,175glbz_OtherRealEstateOwnFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Assets, fair value disclosure $ 80,259,684us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 93,243,837us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember