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FAIR VALUE - Additional Information (Detail Textuals)	6 Months Ended
	Jun. 30, 2013 Basis_Point Security
Securities
Fair Value [Line Items]
Number of securities continuous unrealized loss position more than twelve months	4
Securities | Corporate Trust Preferred
Fair Value [Line Items]
Future defualt basis point on the currently performing financial institutions	150
Fair value inputs recovery rate	0.00%
Number of pooled trust preferred securities	1
Loan | Fair Value, Inputs, Level 3
Fair Value [Line Items]
Number of impaired assets	18
Property | Fair Value, Inputs, Level 2
Fair Value [Line Items]
Number of other real estate owned assets	3

X

- Definition

Fair Value Inputs, Recovery Rate.

+ References

No definition available.

+ Details

Name:	glbz_FairValueInputsRecoveryRate
Namespace Prefix:	glbz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

This element represents the basis point of the future defualt on the currently performing financial institutions.

+ References

No definition available.

+ Details

Name:	glbz_FutureDefaultsBasisPoint
Namespace Prefix:	glbz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of impaired assets.

+ References

No definition available.

+ Details

Name:	glbz_NumberOfImpairedAssets
Namespace Prefix:	glbz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

X

- Definition

Number of Pooled Trust Preferred Securities.

+ References

No definition available.

+ Details

Name:	glbz_NumberOfPooledTrustPreferredSecurities
Namespace Prefix:	glbz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant