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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |
FHLB stock sold back at par value | $ 100glbz_FederalHomeLoanBankStockParValue |  |
Loans converted to OREO through foreclosure proceedings | $ 45,175glbz_TransfersOfLoansToOtherRealEstateOwned | $ 983,000glbz_TransfersOfLoansToOtherRealEstateOwned | $ 254,536glbz_TransfersOfLoansToOtherRealEstateOwned
Computer software | Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Intangible assets amortization period | 3 years |  |
Computer software | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Intangible assets amortization period | 5 years |  |

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- Details
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Period Type: | duration

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- Definition Federal home loan bank stock par value + References No definition available. + Details
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Period Type: | instant

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- Definition Transfers of loans to other real estate owned + References No definition available. + Details
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Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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