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v3.21.1

Loans and Allowance - (Details) | 3 Months Ended
--- | ---
Mar. 31, 2021 borrower loan | Mar. 31, 2020 borrower
Financing Receivable, Impaired [Line Items] |  |
Number of borrowers | borrower | 8 | 14
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Number of loans | loan | 1 |

X
- Definition Represents number of borrowers consumer and indirect loans. + References No definition available. + Details
Name: | glbz_NumberOfBorrowersConsumerAndIndirectLoans
Namespace Prefix: | glbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents number of loans. + References No definition available. + Details
Name: | glbz_NumberOfLoans
Namespace Prefix: | glbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |