Restrictions on Cash and Amounts Due from Banks	12 Months Ended
Dec. 31, 2021
Restrictions on Cash and Amounts Due from Banks
Restrictions on Cash and Amounts Due from Banks	Note 2. Restrictions on Cash and Amounts Due from Banks On March 26, 2020 the Board of Governors of the Federal Reserve System set the reserve requirement ratios to zero percent and reserve requirements were no longer administered. On December 22, 2020 the zero percent reserve requirement ratio was extended for three years. At December 31, 2021 and 2020, the average reserve balances were $0 and $0.4 million, respectively.

Represents the entire disclosure for restricted cash and cash equivalents.

No definition available.

Name:	glbz_RestrictedCashAndCashEquivalentsTextBlock
Namespace Prefix:	glbz_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration