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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Non-accrual loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable Nonaccrual Status
Balance	$ 360	$ 527
Transfer into nonaccrual	1,025	191
Loans paid down/payoffs	(47)	(86)
Loans returned to accrual status	(22)
Loans charged off	(115)	(339)
Balance	1,201	293
Loans Secured by Real Estate
Financing Receivable Nonaccrual Status
Balance	273
Balance	1,001
Loans Secured by Real Estate | Single-family residential
Financing Receivable Nonaccrual Status
Balance	149	145
Transfer into nonaccrual	770
Loans paid down/payoffs	(8)	(44)
Loans returned to accrual status	(21)
Balance	890	101
Loans Secured by Real Estate | Commercial
Financing Receivable Nonaccrual Status
Balance	124
Transfer into nonaccrual		141
Loans paid down/payoffs	(13)	(12)
Balance	111	129
Commercial and Industrial Loans | Commercial and industrial
Financing Receivable Nonaccrual Status
Balance		299
Loans charged off		(299)
Consumer Loans
Financing Receivable Nonaccrual Status
Balance	87
Balance	200
Consumer Loans | Automobile
Financing Receivable Nonaccrual Status
Balance	87	83
Transfer into nonaccrual	255	50
Loans paid down/payoffs	(26)	(30)
Loans returned to accrual status	(1)
Loans charged off	(115)	(40)
Balance	$ 200	$ 63

X

- Definition

Amount of nonaccrual direct write-downs of financing receivables charged against the allowance.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Represents loans returned to accrual status.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Represents nonaccrual loan paid off.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount transfers into non-accrual during the period.

+ References

No definition available.

+ Details

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X

- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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Period Type:	instant

X

- Details

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- Details

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- Details

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- Details

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