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Fair Value Measurements - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Property Loan
Fair Value Disclosures [Abstract] |
Number of loans consisted under non-recurring assets | 28glbz_NumberOfLoans
Number of impaired loans classified as nonaccrual loans | 11glbz_ImpairedLoansClassifiedAsNonaccrualNumberOfLoan
Number of impaired loans classified as accruing loans | 17glbz_ImpairedLoansClassifiedAsAccruingLoansNumberOfLoan
Number of properties classified as OREO | 1glbz_NumberOfOtherRealEstateOwnedAssets
Valuation allowance allocation to the impaired loans | $ 1,270,159us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Maryland financial bank stock written down | $ 30,000glbz_MarylandFinancialBankStockWrittenDown

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- Definition Number of loan classified as impaired and accruing loans as on the balance sheet date. + References No definition available. + Details
Name: | glbz_ImpairedLoansClassifiedAsAccruingLoansNumberOfLoan
Namespace Prefix: | glbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of loan classified as impaired and non accrual as on the balance sheet date. + References No definition available. + Details
Name: | glbz_ImpairedLoansClassifiedAsNonaccrualNumberOfLoan
Namespace Prefix: | glbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of Maryland Financial Bank stock written down during the period due to price of new stock offering + References No definition available. + Details
Name: | glbz_MarylandFinancialBankStockWrittenDown
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents number of loans. + References No definition available. + Details
Name: | glbz_NumberOfLoans
Namespace Prefix: | glbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Other Real Estate Owned Assets. + References No definition available. + Details
Name: | glbz_NumberOfOtherRealEstateOwnedAssets
Namespace Prefix: | glbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant