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Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012 Loan	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans classified as nonaccrual number of loan		17
Maryland financial bank stock written down	$ 70,000
Maryland financial bank stock	$ 30,000	$ 30,000	$ 100,000

X

- Definition

Number of laon classified as impaired and non accural as on the balance sheet date.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Maryland Financial Bank (MFB) stock represents an equity interest in a MFB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

No definition available.

+ Details

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

X

- Definition

Amount of Maryland Financial Bank stock written down during the period due to price of new stock offering

+ References

No definition available.

+ Details

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

X

- Details

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