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Deposits - Total time deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deposits |  |
Over six months through twelve months | $ 552 |
Over twelve months | 581 |
Total Time Deposits of $250,000 or More | $ 1,133 | $ 2,501

X
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more, maturing within three to six months after the balance sheet date. + References No definition available. + Details
Name: | glbz_ContractualMaturitiesTimeDeposits250000OrMore6MonthsThrough12Months
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more, maturing after twelve months from the balance sheet date. + References No definition available. + Details
Name: | glbz_ContractualMaturitiesTimeDeposits250000OrMoreAfter12Months
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. + References No definition available. + Details
Name: | glbz_TimeDeposits250000OrMore
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration