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Commitments and Contingencies - Additional Information (Detail) (USD $)	Dec. 31, 2012
Commitments and Contingencies [Line Items]
Provision for financial receivable unfunded credit losses	$ 200,000

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- Details

Name:	glbz_CommitmentsAndContingenciesLineItems
Namespace Prefix:	glbz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Aggregate amount of credit losses from transactions realted to unfunded commitments for financial instruments

+ References

No definition available.

+ Details

Name:	glbz_ProvisionForFinancialReceivableUnfundedCreditLosses
Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant