Name:	glbz_InterestExpenseTimeDeposits250000OrMore
Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Interest expense incurred on domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of less than $250,000.

No definition available.

Name:	glbz_InterestExpenseTimeDepositsLessThan250000
Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Aggregate amount of all interest expense on domestic deposit liabilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Name:	us-gaap_InterestExpenseDomesticDepositLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of interest expense on domestic money market demand account deposit liabilities.

Name:	us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of interest expense on domestic notice of withdrawal demand deposit liabilities.

Name:	us-gaap_InterestExpenseDomesticDepositLiabilitiesNoticeOfWithdrawal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of interest expense on domestic savings deposit liabilities.