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

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.

No definition available.

Name:	glbz_ContractualMaturitiesTimeDeposits250000OrMore6MonthsThrough12Months
Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant