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Investment Securities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales of available for sale securities $ 30,269,965us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 25,626,845us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 18,656,622us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Realized gain on sale 1,210,332us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 664,269us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 282,069us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Realized loss on sale 54,354us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 318,938us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 119,475us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Income tax expense relating to net gains on sales of investment securities 455,976glbz_AvailableForSaleSecuritiesIncomeTaxExpenseRelatingToNetGainsOnSales 136,216glbz_AvailableForSaleSecuritiesIncomeTaxExpenseRelatingToNetGainsOnSales 64,135glbz_AvailableForSaleSecuritiesIncomeTaxExpenseRelatingToNetGainsOnSales
Schedule of Available-for-sale Securities [Line Items]      
Write-down of investment   15,581us-gaap_ImpairmentOfInvestments  
Securities      
Schedule of Available-for-sale Securities [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 27glbz_NumberOfSecuritiesContinuousUnrealizedLossPositionMoreThanTwelveMonths
/ us-gaap_InvestmentTypeAxis
= us-gaap_SecuritiesInvestmentMember		    
Corporate Trust Preferred      
Schedule of Available-for-sale Securities [Line Items]      
Write-down of investment   $ 15,581us-gaap_ImpairmentOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Assumed future inputs net default basis points rate
This testing assumed future defaults on the currently performing financial institutions of 150 basis points applied annually with a 0% recovery on both current and future defaulting financial institutions.