FAIR VALUE (Details)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans includes nonaccrual, past due 90 days or more and still accruing	$ 416,000
Specific Reserves	$ 21,000	$ 200,000
Minimum \| Discount Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of discount rate	0
Maximum \| Discount Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of discount rate	0.16

Loans classified as impaired includes nonaccrual, past due 90 days or more and still accruing.

No definition available.

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Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- 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

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Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (g)
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

+ Details

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

- Definition

Value of input used to measure loan, held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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Period Type:	instant

- Details

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- Details

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- Details

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