XML 42 R32.htm IDEA: XBRL DOCUMENT
v3.8.0.1

LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of Allowance for credit losses (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Impaired [Line Items] |  |
Troubled debt restructured loans | $ | $ 260,000 | $ 263,000
Non-accrual and 90 days or more and still accruing loans to gross loans | 2.09% | 1.32%
Allowance for credit losses to non-accrual and 90 days or more and still accruing loans | 52.70% | 77.70%
Number of TDRs contracts | loan | 2 | 2
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Troubled debt restructured loans | $ | $ 214,000 |
Number of TDRs contracts | loan | 1 | 1
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Troubled debt restructured loans | $ | $ 46,000 |
Number of TDRs contracts | loan | 1 | 1

X
- Definition Represents Allowance for credit losses to non-accrual and 90 days or more and still accruing loans. + References No definition available. + Details
Name: | glbz_AllowanceForCreditLossesToNonAccrualAnd90DaysOrMoreAndStillAccruingLoans
Namespace Prefix: | glbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents Non-accrual and 90 days or more and still accruing loans to gross loans. + References No definition available. + Details
Name: | glbz_NonAccrualAnd90DaysOrMoreAndStillAccruingLoansToGrossLoans
Namespace Prefix: | glbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition represents Troubled debt restructured loans. + References No definition available. + Details
Name: | glbz_TroubledDebtRestructuredLoans
Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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