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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
FHLB stock sold back at par value $ 100glbz_FederalHomeLoanBankStockParValue    
Loans converted to OREO through foreclosure proceedings $ 45,175glbz_TransfersOfLoansToOtherRealEstateOwned $ 983,000glbz_TransfersOfLoansToOtherRealEstateOwned $ 254,536glbz_TransfersOfLoansToOtherRealEstateOwned
Computer software | Minimum      
Accounting Policies [Line Items]      
Intangible assets amortization period 3 years    
Computer software | Maximum      
Accounting Policies [Line Items]      
Intangible assets amortization period 5 years