Other Operating Expenses (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Operating Expenses [Abstract]
Professional services	$ 677,308	$ 635,502	$ 531,112
Stationery, printing and supplies	185,963	201,883	178,932
Postage and delivery	164,814us-gaap_PostageExpense	139,096us-gaap_PostageExpense	150,374us-gaap_PostageExpense
FDIC assessment	279,584glbz_FdicAssessmentExpense	234,203glbz_FdicAssessmentExpense	39,622glbz_FdicAssessmentExpense
Directors fees and expenses	239,769us-gaap_NoninterestExpenseDirectorsFees	226,881us-gaap_NoninterestExpenseDirectorsFees	194,700us-gaap_NoninterestExpenseDirectorsFees
Marketing	239,437us-gaap_MarketingExpense	207,527us-gaap_MarketingExpense	253,177us-gaap_MarketingExpense
Data processing	25,404	34,909	46,939
Correspondent bank services	45,362glbz_CorrespondentBankServicesExpense	55,444glbz_CorrespondentBankServicesExpense	43,466glbz_CorrespondentBankServicesExpense
Telephone	223,071glbz_TelephoneExpense	255,955glbz_TelephoneExpense	218,414glbz_TelephoneExpense
Liability insurance	73,925glbz_LiabilityInsuranceExpenses	71,722glbz_LiabilityInsuranceExpenses	72,578glbz_LiabilityInsuranceExpenses
Losses (gains) and expenses on OREO	62,493	73,698	68,499
Other ATM expense	125,845glbz_OtherAtmExpense	117,617glbz_OtherAtmExpense	134,510glbz_OtherAtmExpense
Other	705,316us-gaap_OtherCostAndExpenseOperating	462,682us-gaap_OtherCostAndExpenseOperating	454,142us-gaap_OtherCostAndExpenseOperating
Other operating expenses	$ 3,048,291us-gaap_OtherNoninterestExpense	$ 2,717,119us-gaap_OtherNoninterestExpense	$ 2,386,465us-gaap_OtherNoninterestExpense

Represents the amount charged to correspondent bank services expense for the period.

No definition available.

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

- Definition

Represents the amount charged to FDIC assessment expense for the period.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount charged to gain losses and expenses on other real estate owned for the period.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount charged to liability insurance expense for the period.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount charged to other ATM expense for the period.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Represents the amount charged to stationery printing and supplies expense for the period.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount charged to telephone expense for the period.

+ References

No definition available.

+ Details

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

- Definition

The amount of expenses incurred in the period for information technology and data processing products and services.

+ References

+ Details

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

- Definition

Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

+ References

+ Details

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

- Definition

Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

+ Details

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

- Definition

Other noninterest expenses that are not separately presented in any other noninterest expense category.

+ References

+ Details

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

- Definition

Amount of expense associated with postage.

+ References

+ Details

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

- Definition

Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.

+ References

No definition available.

+ Details

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