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LOANS AND ASSET QUALITY - Summary of Allowance for credit losses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
LOANS AND ASSET QUALITY
Troubled debt restructured loans	$ 299	$ 312
Non-accrual and 90 days or more and still accruing loans to gross loans	1.46%	1.43%
Allowance for credit losses to non-accrual and 90 days or more and still accruing loans	66.10%	65.59%

X

- Definition

Represents Allowance for credit losses to non-accrual and 90 days or more and still accruing loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents Non-accrual and 90 days or more and still accruing loans to gross loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	glbz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

represents Troubled debt restructured loans.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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