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Consolidated Statements of Changes in Stockholders' Equity (USD $)
Common Stock
Surplus
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Total
Balances at Dec. 31, 2011 $ 2,717,909us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 9,437,605us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
$ 17,209,386us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 1,845,930us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 31,210,830us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2011 2,717,909us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     2,665,080us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  2,665,080us-gaap_NetIncomeLoss
Cash dividends, $.40 per share     (1,091,302)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (1,091,302)us-gaap_DividendsCommonStockCash
Dividends reinvested under dividend reinvestment plan 19,069us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
167,301us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
    186,370us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
Dividends reinvested under dividend reinvestment plan (in shares) 19,069us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Other comprehensive income (loss), net of tax       616,687us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
616,687us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balances at Dec. 31, 2012 2,736,978us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,604,906us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
18,783,164us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
2,462,617us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
33,587,665us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2012 2,736,978us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     2,614,177us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  2,614,177us-gaap_NetIncomeLoss
Cash dividends, $.40 per share     (1,096,810)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (1,096,810)us-gaap_DividendsCommonStockCash
Dividends reinvested under dividend reinvestment plan 10,392us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
108,429us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
    118,821us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
Dividends reinvested under dividend reinvestment plan (in shares) 10,392us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Other comprehensive income (loss), net of tax       (3,640,692)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(3,640,692)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balances at Dec. 31, 2013 2,747,370us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,713,335us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
20,300,531us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(1,178,075)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
31,583,161us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2013 2,747,370us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     1,914,526us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  1,914,526us-gaap_NetIncomeLoss
Cash dividends, $.40 per share     (1,102,343)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (1,102,343)us-gaap_DividendsCommonStockCash
Dividends reinvested under dividend reinvestment plan 13,594us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
140,784us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
    154,378us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
Dividends reinvested under dividend reinvestment plan (in shares) 13,594us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Other comprehensive income (loss), net of tax       1,280,805us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
1,280,805us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balances at Dec. 31, 2014 $ 2,760,964us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 9,854,119us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= glbz_SurplusMember
$ 21,112,714us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 102,730us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 33,830,527us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2014 2,760,964us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember