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Fair Values of Financial Instruments (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial assets - Carrying Amount      
Cash and due from banks $ 7,101,352us-gaap_CashAndDueFromBanks $ 9,214,503us-gaap_CashAndDueFromBanks $ 9,332,087us-gaap_CashAndDueFromBanks
Interest-bearing deposits in other financial institutions 2,154,817us-gaap_InterestBearingDepositsInBanks 1,636,194us-gaap_InterestBearingDepositsInBanks 6,627,394us-gaap_InterestBearingDepositsInBanks
Federal funds sold 4,024,065us-gaap_FederalFundsSold 102,772us-gaap_FederalFundsSold 2,669,101us-gaap_FederalFundsSold
Investment securities available for sale 87,993,145us-gaap_AvailableForSaleSecurities 74,313,682us-gaap_AvailableForSaleSecurities 100,490,267us-gaap_AvailableForSaleSecurities
Federal Home Loan Bank Stock 1,327,800us-gaap_FederalHomeLoanBankStock 1,452,900us-gaap_FederalHomeLoanBankStock 1,448,000us-gaap_FederalHomeLoanBankStock
Maryland Financial Bank Stock 30,000glbz_MarylandFinancialBankStock 30,000glbz_MarylandFinancialBankStock 30,000glbz_MarylandFinancialBankStock
Ground rents 169,200us-gaap_GroundLeasesNet 169,200us-gaap_GroundLeasesNet 175,200us-gaap_GroundLeasesNet
Loans, less allowance for credit losses 273,986,237us-gaap_LoansAndLeasesReceivableNetReportedAmount 270,684,120us-gaap_LoansAndLeasesReceivableNetReportedAmount 249,631,525us-gaap_LoansAndLeasesReceivableNetReportedAmount
Accrued interest receivable 1,274,137us-gaap_AccruedInvestmentIncomeReceivable 1,509,238us-gaap_AccruedInvestmentIncomeReceivable 1,450,321us-gaap_AccruedInvestmentIncomeReceivable
Financial liabilities - Carrying Amount      
Deposits 338,877,292us-gaap_Deposits 323,803,356us-gaap_Deposits 332,288,886us-gaap_Deposits
Long-term borrowings 20,000,000us-gaap_OtherLongTermDebtCurrent 20,000,000us-gaap_OtherLongTermDebtCurrent 20,000,000us-gaap_OtherLongTermDebtCurrent
Dividends payable 276,096us-gaap_DividendsPayableCurrentAndNoncurrent 274,737us-gaap_DividendsPayableCurrentAndNoncurrent   
Accrued interest payable 39,823us-gaap_DepositLiabilitiesAccruedInterest 28,523us-gaap_DepositLiabilitiesAccruedInterest 28,365us-gaap_DepositLiabilitiesAccruedInterest
Unrecognized financial instruments:      
Commitments to extend credit 21,372,092glbz_CommitmentsToExtentCredit 23,868,826glbz_CommitmentsToExtentCredit 26,235,516glbz_CommitmentsToExtentCredit
Standby letters of credit 57,580glbz_StandbyLettersOfCredit 32,000glbz_StandbyLettersOfCredit 32,000glbz_StandbyLettersOfCredit
Financial assets - Fair Value      
Cash and due from banks 7,101,352glbz_CashAndDueFromBanksFairValue 9,214,503glbz_CashAndDueFromBanksFairValue 9,332,087glbz_CashAndDueFromBanksFairValue
Interest-bearing deposits in other financial institutions 2,154,817glbz_InterestBearingDepositFairValue 1,636,194glbz_InterestBearingDepositFairValue 6,627,394glbz_InterestBearingDepositFairValue
Federal funds sold 4,024,065glbz_FederalFundsSoldFairValue 102,772glbz_FederalFundsSoldFairValue 2,669,101glbz_FederalFundsSoldFairValue
Investment securities available for sale 87,993,145us-gaap_AvailableForSaleSecurities 74,313,682us-gaap_AvailableForSaleSecurities 100,490,267us-gaap_AvailableForSaleSecurities
Federal Home Loan Bank Stock 1,327,800us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure 1,452,900us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure 1,448,000us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
Maryland Financial Bank Stock 30,000glbz_MarylandFinancialBankStockFairValue 30,000glbz_MarylandFinancialBankStockFairValue 30,000glbz_MarylandFinancialBankStockFairValue
Ground rents 169,200glbz_GroundRentsFairValue 169,200glbz_GroundRentsFairValue 175,200glbz_GroundRentsFairValue
Loans, less allowance for credit losses 268,536,000us-gaap_LoansReceivableFairValueDisclosure 270,684,120us-gaap_LoansReceivableFairValueDisclosure 251,419,000us-gaap_LoansReceivableFairValueDisclosure
Accrued interest receivable 1,274,137glbz_AccruedInterestReceivableFairValue 1,509,238glbz_AccruedInterestReceivableFairValue 1,450,321glbz_AccruedInterestReceivableFairValue
Financial liabilities - Fair Value      
Deposits 310,239,000us-gaap_DepositsFairValueDisclosure 291,046,000us-gaap_DepositsFairValueDisclosure 314,680,000us-gaap_DepositsFairValueDisclosure
Long-term borrowings 20,951,000us-gaap_LongTermDebtFairValue 21,032,000us-gaap_LongTermDebtFairValue 21,899,000us-gaap_LongTermDebtFairValue
Dividends payable 276,096glbz_DividendsPayableFairValue 274,737glbz_DividendsPayableFairValue   
Accrued interest payable 39,823glbz_AccruedInterestPayableFairValue 28,523glbz_AccruedInterestPayableFairValue 28,365glbz_AccruedInterestPayableFairValue
Unrecognized financial instruments:      
Commitments to extend credit 21,372,092glbz_CommitmentsToExtendCreditFairValue 23,868,826glbz_CommitmentsToExtendCreditFairValue 26,235,516glbz_CommitmentsToExtendCreditFairValue
Standby letters of credit $ 57,580glbz_StandbyLettersOfCreditFairValue $ 32,000glbz_StandbyLettersOfCreditFairValue $ 32,000glbz_StandbyLettersOfCreditFairValue