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Condensed Cash Flow Statement (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 1,914,526us-gaap_NetIncomeLoss	$ 2,614,177us-gaap_NetIncomeLoss	$ 2,665,080us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets	(56,011)us-gaap_IncreaseDecreaseInOtherOperatingAssets	(637,425)us-gaap_IncreaseDecreaseInOtherOperatingAssets	246,288us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net cash provided by operating activities	2,519,211us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	4,111,763us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	4,089,173us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from financing activities:
Dividends paid	(1,100,984)us-gaap_PaymentsOfDividendsCommonStock	(822,073)us-gaap_PaymentsOfDividendsCommonStock	(1,363,093)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	14,127,330us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(9,188,782)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	18,912,753us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
(Decrease) increase in cash	2,326,765us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(7,675,113)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	8,674,992us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year	10,953,469us-gaap_CashAndCashEquivalentsAtCarryingValue	18,628,582us-gaap_CashAndCashEquivalentsAtCarryingValue	9,953,590us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year	13,280,234us-gaap_CashAndCashEquivalentsAtCarryingValue	10,953,469us-gaap_CashAndCashEquivalentsAtCarryingValue	18,628,582us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company
Cash flows from operating activities:
Net income	1,914,526us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,614,177us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,665,080us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets	3,424us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(7,665)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Increase) in due from subsidiaries	(28)us-gaap_IncreaseDecreaseInDueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(705)us-gaap_IncreaseDecreaseInDueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(335)us-gaap_IncreaseDecreaseInDueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in undistributed equity of subsidiaries	(983,765)glbz_IncreaseDecreaseInInvestmentInEquityMethodInvestment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,682,212)glbz_IncreaseDecreaseInInvestmentInEquityMethodInvestment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,726,441)glbz_IncreaseDecreaseInInvestmentInEquityMethodInvestment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by operating activities	934,157us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	923,595us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	938,304us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities:
Proceeds from dividend reinvestment plan	154,378us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	118,821us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	186,369us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends paid	(1,100,984)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(822,073)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,363,093)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in financing activities	(946,606)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(703,252)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,176,724)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Decrease) increase in cash	(12,449)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	220,343us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(238,420)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of year	296,245us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	75,902us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	314,322us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents, end of year	$ 283,796us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 296,245us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 75,902us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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