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Deposits (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Deposits |  |  |
Wholesale deposits included in time deposits | $ 51,979,000 |  |
Overdraft demand deposits reclassified as loans | 3,422,000 | 3,482,000 |
Deposits with related parties | 12,770,000 | 20,404,000 |
Debit card expense | $ 6,131,000 | $ 4,497,000 | $ 4,400,000

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- Definition Debit card expense. + References No definition available. + Details
Name: | gbci_DebitCardExpense
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | gbci_DepositsTextualAbstract
Namespace Prefix: | gbci_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Overdraft demand deposits reclassified as loans. + References No definition available. + Details
Name: | gbci_OverdraftDemandDepositsReclassifiedAsLoans
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Wholesale deposits included in time deposits. + References No definition available. + Details
Name: | gbci_WholesaleDepositsIncludedInTimeDeposits
Namespace Prefix: | gbci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant