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Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis |  |
Collateral-dependent impaired loans, net of ALLL | $ 18,239 |
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis |  |
Other real estate owned | 1,156 | 13,983
Collateral-dependent impaired loans, net of ALLL | 18,239 | 22,966
Total assets measured at fair value on a non-recurring basis | 19,395 | 36,949
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis |  |
Other real estate owned | 0 | 0
Collateral-dependent impaired loans, net of ALLL | 0 | 0
Total assets measured at fair value on a non-recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis |  |
Other real estate owned | 0 | 0
Collateral-dependent impaired loans, net of ALLL | 0 | 0
Total assets measured at fair value on a non-recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis |  |
Other real estate owned | 1,156 | 13,983
Collateral-dependent impaired loans, net of ALLL | 18,239 | 22,966
Total assets measured at fair value on a non-recurring basis | $ 19,395 | $ 36,949

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- Definition Collateral dependent impaired loans owned fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other real estate owned fair value disclosure. + References No definition available. + Details
Name: | gbci_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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