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Pension and Profit Sharing Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Annual contributions, included in employee benefit expense	$ 229,500us-gaap_MultiemployerPlanPeriodContributions	$ 260,400us-gaap_MultiemployerPlanPeriodContributions	$ 241,035us-gaap_MultiemployerPlanPeriodContributions
Amount of additional contributions under this plan for benefit of certain employees	8,098glbz_MultiemployerPlanPeriodAdditionalContributions	8,159glbz_MultiemployerPlanPeriodAdditionalContributions	8,159glbz_MultiemployerPlanPeriodAdditionalContributions
Amount of discretionary employer matching contributions to plan	$ 228,516us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 304,558us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 317,108us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X

- Definition

Amount of additional contributions made to multiemployer plans by the employer for the benefit of certain employees, whose retirement funds were negatively affected by the termination of a prior defined benefit pension plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration