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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended
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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 |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(3)(i)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21332-112643 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21346-112643 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph a(4) -Article 7 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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