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Premises and Equipment - Additional Information (Detail) (USD $)
12 Months Ended
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