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VIE Carrying Amounts Included in Financial Statements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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CDE (NMTC) |  |
Carrying amounts of the VIEs' assets and liabilities |  |
Loans receivable | $ 36,077gbci_VariableInterestEntityConsolidatedCarryingAmountLoansandLeasesReceivableNetofDeferredIncome / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | $ 36,039gbci_VariableInterestEntityConsolidatedCarryingAmountLoansandLeasesReceivableNetofDeferredIncome / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Premises and equipment, net | 0gbci_VariableInterestEntityConsolidatedCarryingAmountPropertyPlantandEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 0gbci_VariableInterestEntityConsolidatedCarryingAmountPropertyPlantandEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Accrued interest receivable | 116gbci_VariableInterestEntityConsolidatedCarryingAmountInterestReceivable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 117gbci_VariableInterestEntityConsolidatedCarryingAmountInterestReceivable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Other assets | 616gbci_VariableInterestEntityConsolidatedCarryingAmountOtherAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 843gbci_VariableInterestEntityConsolidatedCarryingAmountOtherAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Total assets | 36,809us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 36,999us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Other borrowed funds | 4,555gbci_VariableInterestEntityConsolidatedCarryingAmountOtherBorrowings / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 4,555gbci_VariableInterestEntityConsolidatedCarryingAmountOtherBorrowings / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Accrued interest payable | 4gbci_VariableInterestEntityConsolidatedCarryingAmountInterestPayable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 4gbci_VariableInterestEntityConsolidatedCarryingAmountInterestPayable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Other liabilities | 185gbci_VariableInterestEntityConsolidatedCarryingAmountOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 151gbci_VariableInterestEntityConsolidatedCarryingAmountOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
Total liabilities | 4,744us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember | 4,710us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_CertifiedDevelopmentEntitiesMember
LIHTC |  |
Carrying amounts of the VIEs' assets and liabilities |  |
Loans receivable | 0gbci_VariableInterestEntityConsolidatedCarryingAmountLoansandLeasesReceivableNetofDeferredIncome / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 0gbci_VariableInterestEntityConsolidatedCarryingAmountLoansandLeasesReceivableNetofDeferredIncome / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Premises and equipment, net | 13,106gbci_VariableInterestEntityConsolidatedCarryingAmountPropertyPlantandEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 13,536gbci_VariableInterestEntityConsolidatedCarryingAmountPropertyPlantandEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Accrued interest receivable | 0gbci_VariableInterestEntityConsolidatedCarryingAmountInterestReceivable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 0gbci_VariableInterestEntityConsolidatedCarryingAmountInterestReceivable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Other assets | 258gbci_VariableInterestEntityConsolidatedCarryingAmountOtherAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 153gbci_VariableInterestEntityConsolidatedCarryingAmountOtherAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Total assets | 13,364us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 13,689us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Other borrowed funds | 1,690gbci_VariableInterestEntityConsolidatedCarryingAmountOtherBorrowings / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 1,723gbci_VariableInterestEntityConsolidatedCarryingAmountOtherBorrowings / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Accrued interest payable | 5gbci_VariableInterestEntityConsolidatedCarryingAmountInterestPayable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 5gbci_VariableInterestEntityConsolidatedCarryingAmountInterestPayable / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Other liabilities | 0gbci_VariableInterestEntityConsolidatedCarryingAmountOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | 189gbci_VariableInterestEntityConsolidatedCarryingAmountOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember
Total liabilities | $ 1,695us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember | $ 1,917us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gbci_LowIncomeHousingTaxCreditMember

X
- Definition The carrying amount of the consolidated Variable Interest Entity's interest payable included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountInterestPayable
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's interest receivable included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountInterestReceivable
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's loans and leases receivable included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountLoansandLeasesReceivableNetofDeferredIncome
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's other assets included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountOtherAssets
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's other borrowings included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountOtherBorrowings
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's other liabilities included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountOtherLiabilities
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's property, plant and equipment included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | gbci_VariableInterestEntityConsolidatedCarryingAmountPropertyPlantandEquipmentNet
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
Name: | us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
Name: | us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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