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VIE Carrying Amounts Included in Financial Statements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
CDE (NMTC) |  |
Carrying amounts of the entities assets and liabilities |  |
Loans receivable | $ 35,956 | $ 35,480
Premises and equipment, net | 0 | 0
Accrued interest receivable | 113 | 117
Other assets | 903 | 1,114
Total assets | 36,972 | 36,711
Other borrowed funds | 4,555 | 4,555
Accrued interest payable | 4 | 4
Other liabilities | 92 | 182
Total liabilities | 4,651 | 4,741
LIHTC |  |
Carrying amounts of the entities assets and liabilities |  |
Loans receivable | 0 | 0
Premises and equipment, net | 13,641 | 16,066
Accrued interest receivable | 0 | 0
Other assets | 153 | 143
Total assets | 13,794 | 16,209
Other borrowed funds | 1,723 | 3,639
Accrued interest payable | 5 | 6
Other liabilities | 203 | 136
Total liabilities | $ 1,931 | $ 3,781

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