The amount of gain (losses) on sale of other real estate property.

No definition available.

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

- Definition

Represents number of borrowers consumer and indirect loans.

+ References

No definition available.

+ Details

Name:	glbz_NumberOfBorrowersConsumerAndIndirectLoans
Namespace Prefix:	glbz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

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

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5162-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4437-111522

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - (Details)	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2021 USD ($) borrower loan	Jun. 30, 2020 borrower	Dec. 31, 2020 USD ($)
Financing Receivable, Impaired [Line Items]
Number of borrowers \| borrower			12	20
Real estate acquired through foreclosure	$ 0	$ 0	$ 0		$ 575,000
Proceeds from sale of real estate	589,000		589,000
Gains on sale of OREO	$ 14,000	$ 14,000	$ 14,000
Consumer
Financing Receivable, Impaired [Line Items]
Number of loans \| loan	1	1	1
Consumer \| Consumer Loans
Financing Receivable, Impaired [Line Items]
Number of loans \| loan	1	1	1
Number of borrowers \| borrower			1