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Premises and Equipment - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Abstract] |  |  |
Depreciation expense | $ 399,083us-gaap_Depreciation | $ 392,146us-gaap_Depreciation | $ 409,032us-gaap_Depreciation
Amortization of software and intangible assets | 21,970us-gaap_AdjustmentForAmortization | 26,236us-gaap_AdjustmentForAmortization | 42,791us-gaap_AdjustmentForAmortization
Rent expense | 150,145us-gaap_LeaseAndRentalExpense | 137,232us-gaap_LeaseAndRentalExpense | 141,170us-gaap_LeaseAndRentalExpense
Severna Park |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Minimum lease obligations through September 2012 | 30,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / glbz_LeasedPropertyAxis = glbz_SevernaParkMember |  |
Minimum lease obligations through September 2015 | 33,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / glbz_LeasedPropertyAxis = glbz_SevernaParkMember |  |
Linthicum Branches |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Minimum lease obligation through December 2024 | $ 120,952glbz_MinimumLeaseObligationLaterOn / glbz_LeasedPropertyAxis = glbz_LinthicumBranchesMember |  |

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Details
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