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Pension and Profit Sharing Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension and Profit Sharing Plans
Annual contributions included in employee benefit expense	$ 258,000	$ 479,000

X

- Definition

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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