FAIR VALUE (Detail Textuals)	9 Months Ended
Sep. 30, 2016 USD ($) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of impaired loans classified as nonaccrual loans \| Loans	25
Loans deemed to be impaired	$ 3,700,000
Impaired real estate loans	$ 3,000,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of discount rate	0.00%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of discount rate	16.00%
Consumer and indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans includes nonaccrual, past due 90 days or more and still accruing	$ 408,000
Remaining impaired loan	641,000
Specific reserve amount	$ 286,000

Represents amount of allowance for credit losses related to recorded investment

No definition available.

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

- Definition

Represents amount of remaining impaired loan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of loan classified as impaired and non accrual as on the balance sheet date.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Loans classified as impaired includes nonaccrual, past due 90 days or more and still accruing.

+ References

No definition available.

+ Details

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

- Definition

Represents loans which are deemed to be impaired.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

+ Details

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Period Type:	instant

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- Details

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