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Commitments and Contingencies (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Loan commitments: |  |  |
Unfunded loan commitments amount | $ 7,047,000 | $ 3,330,000 | $ 2,013,000
Unused lines of credit: |  |  |
Financial receivable line of credit unused current | 19,188,516 | 19,374,032 | 19,677,058
Letters of credit: | 32,000 | 32,000 | 71,762
Construction and land development |  |  |
Loan commitments: |  |  |
Unfunded loan commitments amount | 822,000 | 260,000 | 0
Other mortgage loans |  |  |
Loan commitments: |  |  |
Unfunded loan commitments amount | 6,225,000 | 3,070,000 | 2,013,000
Home-equity lines |  |  |
Unused lines of credit: |  |  |
Financial receivable line of credit unused current | 9,882,497 | 9,232,242 | 8,130,179
Commercial lines |  |  |
Unused lines of credit: |  |  |
Financial receivable line of credit unused current | 8,615,844 | 9,368,770 | 10,738,826
Secured consumer line |  |  |
Unused lines of credit: |  |  |
Financial receivable line of credit unused current | 3,002 | 19,175 | 0
Unsecured consumer lines |  |  |
Unused lines of credit: |  |  |
Financial receivable line of credit unused current | $ 687,173 | $ 753,845 | $ 808,053

X
- Definition "The amount of available credit is considered readily available for withdrawal or for direct purchases,that may be drawn down, or is due to be contractually funded in the future." + References No definition available. + Details
Name: | glbz_FinancialReceivableLineOfCreditUnusedCurrent
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition A loan amount that may be drawn down, or is due to be contractually funded in the future. + References No definition available. + Details
Name: | glbz_UnfundedLoanCommitmentsAmount
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant