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Other Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Expenses      
Debit Card Expense $ 5,802gbci_DebitCardExpense $ 6,131gbci_DebitCardExpense $ 4,497gbci_DebitCardExpense
VIE Write-downs, Losses and Other Expenses 4,231gbci_VIEWritedownsLossesandOtherExpenses 4,210gbci_VIEWritedownsLossesandOtherExpenses 3,879gbci_VIEWritedownsLossesandOtherExpenses
Consulting Fees 4,179gbci_ConsultingFees 3,243gbci_ConsultingFees 2,079gbci_ConsultingFees
Miscellaneous Employee Expenses 3,557gbci_MiscellaneousEmployeeExpenses 2,686gbci_MiscellaneousEmployeeExpenses 2,098gbci_MiscellaneousEmployeeExpenses
Supplies Expense 3,547us-gaap_SuppliesExpense 3,112us-gaap_SuppliesExpense 2,922us-gaap_SuppliesExpense
Deposit-Related Expenses 3,517gbci_DepositRelatedExpenses 3,091gbci_DepositRelatedExpenses 1,644gbci_DepositRelatedExpenses
Postage Expense 3,391us-gaap_PostageExpense 3,302us-gaap_PostageExpense 3,120us-gaap_PostageExpense
Telephone Expenses 2,911gbci_TelephoneExpenses 2,498gbci_TelephoneExpenses 2,252gbci_TelephoneExpenses
Loan-Related Expenses 2,513gbci_LoanRelatedExpenses 2,444gbci_LoanRelatedExpenses 3,430gbci_LoanRelatedExpenses
Legal Fees 1,455us-gaap_LegalFees 1,728us-gaap_LegalFees 1,521us-gaap_LegalFees
Accounting Fees 1,393gbci_AccountingFees 1,146gbci_AccountingFees 1,442gbci_AccountingFees
ATM Expenses 1,268gbci_ATMExpenses 1,087gbci_ATMExpenses 1,161gbci_ATMExpenses
Other Cost and Expense, Operating 3,884us-gaap_OtherCostAndExpenseOperating 4,178us-gaap_OtherCostAndExpenseOperating 6,042us-gaap_OtherCostAndExpenseOperating
Other Noninterest Expense $ 41,648us-gaap_OtherNoninterestExpense $ 38,856us-gaap_OtherNoninterestExpense $ 36,087us-gaap_OtherNoninterestExpense