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Long-term Borrowings - Additional Information (Detail) (Federal Home Loan Bank of Atlanta, USD $)	12 Months Ended
	Dec. 31, 2007	Dec. 31, 2008
Convertible advances maturing on November, 1, 2017
Debt Instrument [Line Items]
Convertible debt	$ 10,000,000us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = glbz_ConvertibleAdvancesMaturingInNovemberFirstTwoThousandSeventeenMember / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember
Debt instrument, maturity date	Nov. 01, 2017
Debt instrument, interest rate, stated percentage	3.28%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = glbz_ConvertibleAdvancesMaturingInNovemberFirstTwoThousandSeventeenMember / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember
Convertible advances maturing on July 23, 2018
Debt Instrument [Line Items]
Convertible debt		5,000,000us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = glbz_ConvertibleAdvancesMaturingInJulyTwentyThirdTwoThousandEighteenMember / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember
Debt instrument, maturity date		Jul. 23, 2018
Debt instrument callable quarterly date		Jul. 23, 2009
Debt instrument, interest rate, stated percentage		2.73%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = glbz_ConvertibleAdvancesMaturingInJulyTwentyThirdTwoThousandEighteenMember / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember
Convertible advances maturing on August 22, 2018
Debt Instrument [Line Items]
Convertible debt		$ 5,000,000us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = glbz_ConvertibleAdvancesMaturingInAugustTwentyTwoTwoThousandEighteenMember / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember
Debt instrument, maturity date		Aug. 22, 2018
Debt instrument callable quarterly date		Aug. 22, 2011
Debt instrument, interest rate, stated percentage		3.34%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = glbz_ConvertibleAdvancesMaturingInAugustTwentyTwoTwoThousandEighteenMember / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember

X

- Definition

Debt Instrument Callable Quarterly Date.

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
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Balance Type:	na
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- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a)(2))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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