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Fair Value Measurements (Detail Textuals)	12 Months Ended
	Dec. 31, 2016 USD ($) Loan Property
Fair Value Disclosures [Abstract]
Number of loans consisted under non-recurring assets	24
Number of impaired loans classified as nonaccrual loans	5
Number of impaired loans classified as accruing loans	19
Number of properties classified as OREO | Property	2
Specific valuation allowance for impaired loans | $	$ 293,502

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_
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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

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Namespace Prefix:	glbz_
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X

- Definition

Represents number of loans.

+ 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 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

- References

No definition available.

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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