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Loans and Allowance - Non-accrual loans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | $ 4,127 | $ 1,947
Transfer into non-accrual | 177 | 1,061
Loans paid down/payoffs | (74) | (315)
Loans return to accrual status | (17) | (19)
Loans charged off | (125) | (212)
Balance | 4,088 | 2,462
Consumer |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 137 | 186
Transfer into non-accrual |  | 134
Loans paid down/payoffs | (5) | (8)
Balance | 132 | 312
Residential Real estate |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 728 | 956
Transfer into non-accrual |  | 571
Loans paid down/payoffs | (15) | (283)
Loans charged off |  | (12)
Balance | 713 | 1,232
Indirect |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 123 | 116
Transfer into non-accrual | 177 | 270
Loans paid down/payoffs | (22) | (8)
Loans return to accrual status | (17) | (19)
Loans charged off | (125) | (173)
Balance | 136 | 186
Commercial |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance |  | 27
Transfer into non-accrual |  | 86
Loans charged off |  | (27)
Balance |  | 86
Commercial Real Estate |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 3,139 | 662
Loans paid down/payoffs | (32) | (16)
Balance | $ 3,107 | $ 646

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- Definition Amount of nonaccrual direct write-downs of financing receivables charged against the allowance. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Represents loans returned to accrual status. + References No definition available. + Details
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Balance Type: | debit
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- Definition Represents nonaccrual loan paid off. + References No definition available. + Details
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- Definition Represents amount transfers into non-accrual during the period. + References No definition available. + Details
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Namespace Prefix: | glbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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