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Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Property Loan
Fair Value Disclosures [Abstract]
Number of loans consisted under non-recurring assets	28glbz_NumberOfLoans
Number of impaired loans classified as nonaccrual loans	11glbz_ImpairedLoansClassifiedAsNonaccrualNumberOfLoan
Number of impaired loans classified as accruing loans	17glbz_ImpairedLoansClassifiedAsAccruingLoansNumberOfLoan
Number of properties classified as OREO	1glbz_NumberOfOtherRealEstateOwnedAssets
Valuation allowance allocation to the impaired loans	$ 1,270,159us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Maryland financial bank stock written down	$ 30,000glbz_MarylandFinancialBankStockWrittenDown

X

- Definition

Number of loan classified as impaired and accruing loans as on the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

Number of loan classified as impaired and non accrual as on the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of Maryland Financial Bank stock written down during the period due to price of new stock offering

+ References

No definition available.

+ Details

Name:	glbz_MarylandFinancialBankStockWrittenDown
Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents number of loans.

+ References

No definition available.

+ Details

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

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

- Details

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

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant