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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loans converted to OREO through foreclosure proceedings total | $ 254,536 | $ 1,307,203 | $ 512,247
FHLB stock can be sold back only at its par value | $ 100 |  |

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- Definition Federal home loan bank stock par value + References No definition available. + Details
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Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | glbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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