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Variable Interest Entities VIE Net Income or Loss and Tax Credits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
CDE (NMTC) |  |  |  |
Consolidated VIEs |  |  |  |
VIE loss | $ (899) | $ (896) | $ (690) | $ (687)
Federal income tax credits | 1,165 | 1,164 | 1,165 | 1,164
LIHTC |  |  |  |
Consolidated VIEs |  |  |  |
VIE loss | (251) | (271) | (503) | (541)
Federal income tax credits | $ 293 | $ 317 | $ 587 | $ 635

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- Definition The net amount of the consolidated Variable Interest Entity's income or loss included in the entity's statement of operations. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedIncomeorLossNet
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of the consolidated Variable Interest Entity's tax credits included in the entity's statement of operations. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedTaxCreditAmount
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=gbci_CertifiedDevelopmentEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=gbci_LowIncomeHousingTaxCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |