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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stockholders Equity [Line Items]      
Retained earnings from which dividends may not be paid without prior approval, total 17,171,000us-gaap_RetainedEarningsAppropriated 15,293,000us-gaap_RetainedEarningsAppropriated 14,312,000us-gaap_RetainedEarningsAppropriated
Employee stock purchase benefit plans      
Stockholders Equity [Line Items]      
Employee eligibility period 1 year    
Employees to buy stock under options granted 85.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
/ us-gaap_PlanNameAxis
= glbz_EmployeeStockPurchaseMember		    
Options are vested when granted and will expire no later than 27 months    
Common stock, capital shares reserved for future issuance 48,011us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= glbz_EmployeeStockPurchaseMember		    
Dividend reinvestment and stock purchase plan      
Stockholders Equity [Line Items]      
Shares of common stock purchased 13,594us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_PlanNameAxis
= glbz_DividendReinvestmentAndStockPurchasePlanMember		 10,392us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_PlanNameAxis
= glbz_DividendReinvestmentAndStockPurchasePlanMember		 19,069us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_PlanNameAxis
= glbz_DividendReinvestmentAndStockPurchasePlanMember
Common stock, capital shares reserved for future issuance 197,524us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= glbz_DividendReinvestmentAndStockPurchasePlanMember		    
Stockholder purchase plan      
Stockholders Equity [Line Items]      
Common stock, capital shares reserved for future issuance 313,919us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= glbz_StockholderPurchasePlanMember