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Deposits (Details Textual) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deposits    
FDIC Insurance limit $ 250,000us-gaap_CashFDICInsuredAmount  
Time deposits that meet or exceed FDIC Insurance limit 314,752,000gbci_TimeDepositsThatMeetorExceedFDICInsuranceLimit 232,783,000gbci_TimeDepositsThatMeetorExceedFDICInsuranceLimit
Wholesale deposits included in time deposits 15,699,000gbci_WholesaleDepositsIncludedInTimeDeposits  
Overdraft demand deposits reclassified as loans 4,385,000gbci_OverdraftDemandDepositsReclassifiedAsLoans 3,422,000gbci_OverdraftDemandDepositsReclassifiedAsLoans
Deposits with related parties $ 11,263,000us-gaap_RelatedPartyDepositLiabilities $ 12,770,000us-gaap_RelatedPartyDepositLiabilities