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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Allowance for credit losses (Details)	3 Months Ended					12 Months Ended
	Mar. 31, 2019 USD ($) borrower	Mar. 31, 2019 USD ($) loan	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) borrower	Dec. 31, 2018 USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Average loans				$ 299,506,000	$ 273,964,000
Net charge-offs to average loans (annualized)			0.27%		0.07%
Number of borrowers	19	1			7
Loans charged off				205,000	$ 102,000	$ 1,151,000
Outstanding commitments	$ 33,000,000	$ 33,000,000	$ 33,000,000	33,000,000	24,700,000
Unfunded commitments
Beginning balance				35,000	24,000	24,000
Reduction of unfunded reserve				(9,000)	(18,000)
Provisions charged to operations					6,000
Ending balance				$ 26,000	$ 12,000	$ 35,000

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
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X

- Definition

Represents number of borrowers consumer and indirect loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

The amount of provisions charged to operations.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of reduction of unfunded reserve..

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of reserve for unfunded commitments.

+ References

No definition available.

+ Details

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

X

- Definition

NA

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

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

+ References

Reference 1: 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=84173941&loc=SL6953423-111524

+ Details

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

X

- 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.

+ Details

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