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Short Term Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Financial_Institution
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]      
Federal home loan bank shares owned 13,278glbz_FederalHomeLoanBankSharesOwned    
Percentage of investment to be maintained on total assets 0.20%glbz_PercentageOfInvestmentToBeMaintainedOnTotalAssets    
Additional percentage of investment to be maintained on total advances 4.50%glbz_AdditionalPercentageOfInvestmentToBeMaintainedOnTotalAdvances    
Percentage of credit available on total assets 20.00%glbz_PercentageOfCreditAvailableOnTotalAssets    
Amount of credit available on total assets $ 69,169,000glbz_AmountOfCreditAvailableOnTotalAssets    
Long-term federal home loan bank advances 20,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm    
Average short-term borrowings 24,658us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate 1,838,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate 399,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
Number of financial institution lending credit facility 3glbz_NumberOfFinancialInstitutionLendingCreditFacility    
Federal Funds | Financial Bank One      
Short-term Debt [Line Items]      
Line of credit, amount available for borrowing 3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= glbz_FederalFundsMember
/ us-gaap_LineOfCreditFacilityAxis
= glbz_FinancialBankOneMember		    
Federal Funds | Financial Bank Two      
Short-term Debt [Line Items]      
Line of credit, amount available for borrowing 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= glbz_FederalFundsMember
/ us-gaap_LineOfCreditFacilityAxis
= glbz_FinancialBankTwoMember		    
Federal Funds | Financial bank three      
Short-term Debt [Line Items]      
Line of credit, amount available for borrowing $ 8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= glbz_FederalFundsMember
/ us-gaap_LineOfCreditFacilityAxis
= glbz_FinancialBankThreeMember