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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) borrower	Mar. 31, 2021 USD ($) borrower	Dec. 31, 2021 USD ($)
Financing Receivable, Allowance For Credit Losses [Line Items]
Average loans	$ 207,321,000	$ 248,920,000
Net charge-offs to average loans (annualized)	(0.02%)	(0.44%)
Number of borrowers | borrower	5	8
Loans charged off	$ 64,000	$ 81,000	$ 253,000
Outstanding commitments	28,100,000		31,800,000
Unfunded commitments
Beginning balance	371,000	33,000	33,000
Reduction of unfunded reserve	(17,000)	(12,000)
Ending balance	$ 354,000	478,000	$ 371,000
ASU 2016-13
Unfunded commitments
Impact of ASC 326 adoption		$ 457,000

X

- Definition

The Average of Loans and Leases Receivable Net of Deferred Income.

+ References

No definition available.

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- Definition

Net Charge Offs to Average Loans and Leases Receivables as a percentage

+ References

No definition available.

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X

- Definition

Represents number of borrowers consumer and indirect loans.

+ References

No definition available.

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Namespace Prefix:	glbz_
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X

- Definition

The amount of reduction of unfunded reserve..

+ References

No definition available.

+ Details

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- Definition

The amount of reserve for unfunded commitments.

+ References

No definition available.

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- Definition

NA

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No definition available.

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Balance Type:	na
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- Definition

Unfunded commitment impact from ASC adoption.

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No definition available.

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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.

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

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