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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Non-accrual loans (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 3,270	$ 3,751
Transfer into non-accrual	2,532	609
Loans paid down/payoffs	(299)	(335)
Loans return to accrual status	(50)	(244)
Loans charged off	(768)	(254)
Balance	4,685	3,527
Consumer
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	185	403
Transfer into non-accrual	44	4
Loans paid down/payoffs	(15)	(67)
Loans charged off	(92)	(4)
Balance	122	336
Residential Real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	2,124	2,508
Transfer into non-accrual	183	40
Loans paid down/payoffs	(41)	(82)
Loans return to accrual status		(132)
Loans charged off	(513)	(3)
Balance	1,753	2,331
Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	88	193
Transfer into non-accrual	305	349
Loans paid down/payoffs	(51)	(96)
Loans return to accrual status	(50)	(112)
Loans charged off	(163)	(247)
Balance	129	87
Commercial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	48
Loans paid down/payoffs	(48)
Construction
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	318
Transfer into non-accrual		84
Loans paid down/payoffs	(8)	(84)
Balance	310
Commercial Real Estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	507	647
Transfer into non-accrual	2,000	132
Loans paid down/payoffs	(136)	(6)
Balance	$ 2,371	$ 773

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Represents loans returned to accrual status.

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

X

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

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- Details

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