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LOANS AND ASSET QUALITY - Summary of Allowance for credit losses (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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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%

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- 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

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- 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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- Definition represents Troubled debt restructured loans. + References No definition available. + Details
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Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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