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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Allowance for credit losses (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) borrower	Jun. 30, 2017 USD ($) borrower	Dec. 31, 2017 USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Outstanding commitments	$ 33,800,000	$ 24,000,000
Beginning balance	24,000	25,000	$ 25,000
Reduction of unfunded reserve	(18,000)	(20,000)
Provisions charged to operations	37,000	17,000
Ending balance	43,000	22,000	24,000
Loans charged off	769,000	254,000	$ 566,000
Average loans	$ 281,104,000	$ 269,533,000
Net charge-offs to average loans (annualized)	0.48%	0.04%
Number of borrowers | borrower	25	38

X

- Definition

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

+ References

No definition available.

+ Details

Name:	glbz_AverageOfLoansAndLeasesReceivableNetOfDeferredIncome
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_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents number of borrowers consumer and indirect loans.

+ References

No definition available.

+ Details

Name:	glbz_NumberOfBorrowersConsumerAndIndirectLoans
Namespace Prefix:	glbz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of provisions charged to operations.

+ References

No definition available.

+ Details

Name:	glbz_ProvisionsChargedToOperations
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

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

X

- Definition

The amount of reserve for unfunded commitments.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
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

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