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v2.4.1.9

Condensed Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Activities |  |  |
Net income | $ 112,755us-gaap_NetIncomeLoss | $ 95,644us-gaap_NetIncomeLoss | $ 75,516us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Loss on sale of investments | 188us-gaap_GainLossOnSaleOfSecuritiesNet | 299us-gaap_GainLossOnSaleOfSecuritiesNet | 0us-gaap_GainLossOnSaleOfSecuritiesNet
Excess tax (benefits) deficiencies from stock-based compensation | (138)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 223us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 8us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net cash provided by operating activities | 182,734us-gaap_NetCashProvidedByUsedInOperatingActivities | 334,095us-gaap_NetCashProvidedByUsedInOperatingActivities | 183,793us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities |  |  |
Maturities, prepayments and calls of available-for-sale securities | 628,238us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 1,682,363us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 2,041,416us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Net addition of premises and equipment | (14,389)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (8,977)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (10,730)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net sale of non-marketable equity securities | 801gbci_PaymentsForProceedsFromNonMarketableEquitySecurities | 583gbci_PaymentsForProceedsFromNonMarketableEquitySecurities | 888gbci_PaymentsForProceedsFromNonMarketableEquitySecurities
Net cash provided by (used in) investing activities | 158,893us-gaap_NetCashProvidedByUsedInInvestingActivities | 149,237us-gaap_NetCashProvidedByUsedInInvestingActivities | (579,646)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities |  |  |
Net increase in other borrowed funds | (933)us-gaap_ProceedsFromRepaymentsOfOtherDebt | (1,502)us-gaap_ProceedsFromRepaymentsOfOtherDebt | 180us-gaap_ProceedsFromRepaymentsOfOtherDebt
Cash dividends paid | (50,944)us-gaap_PaymentsOfDividendsCommonStock | (44,232)us-gaap_PaymentsOfDividendsCommonStock | (47,472)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefits (deficiencies) from stock-based compensation | 138us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | (223)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | (8)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Stock-based compensation activity | 785us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 4,326us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 81us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Net cash used in financing activities | (54,875)us-gaap_NetCashProvidedByUsedInFinancingActivities | (514,715)us-gaap_NetCashProvidedByUsedInFinancingActivities | 454,861us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents | 286,752us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (31,383)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 59,008us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 155,657us-gaap_CashAndCashEquivalentsAtCarryingValue | 187,040us-gaap_CashAndCashEquivalentsAtCarryingValue | 128,032us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 442,409us-gaap_CashAndCashEquivalentsAtCarryingValue | 155,657us-gaap_CashAndCashEquivalentsAtCarryingValue | 187,040us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company |  |  |
Operating Activities |  |  |
Net income | 112,755us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 95,644us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 75,516us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Subsidiary income (in excess of) less than dividends distributed | (39,451)gbci_SubsidiaryIncomeInExcessOfLessThanDividendsDistributed / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (37,129)gbci_SubsidiaryIncomeInExcessOfLessThanDividendsDistributed / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,040)gbci_SubsidiaryIncomeInExcessOfLessThanDividendsDistributed / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss on sale of investments | 0us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,248us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax (benefits) deficiencies from stock-based compensation | (138)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 223us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in other assets and other liabilities | 140us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,575us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,684us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by operating activities | 73,306us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 64,561us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 78,168us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investing Activities |  |  |
Proceeds from Sale, Maturity and Collection of Investments | 0us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,990us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Maturities, prepayments and calls of available-for-sale securities | 0us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,571us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 787us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Changes in investment securities and other stock - intercompany | 0gbci_ChangesinInvestmentSecuritiesandOtherStockIntercompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (946)gbci_ChangesinInvestmentSecuritiesandOtherStockIntercompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (19,183)gbci_ChangesinInvestmentSecuritiesandOtherStockIntercompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net addition of premises and equipment | (179)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (603)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,927)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net sale of non-marketable equity securities | (667)gbci_PaymentsForProceedsFromNonMarketableEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0gbci_PaymentsForProceedsFromNonMarketableEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0gbci_PaymentsForProceedsFromNonMarketableEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity contribution to subsidiaries | (18,115)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,336)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (28,500)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) investing activities | (18,961)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13,676us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (49,823)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Financing Activities |  |  |
Net increase in other borrowed funds | 143us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 144us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 143us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends paid | (50,944)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (44,232)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (47,472)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefits (deficiencies) from stock-based compensation | 138us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (223)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock-based compensation activity | 785us-gaap_ProceedsFromIssuanceOrSaleOfEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,326us-gaap_ProceedsFromIssuanceOrSaleOfEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 81us-gaap_ProceedsFromIssuanceOrSaleOfEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in financing activities | (49,878)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (39,985)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (47,256)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents | 4,467us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38,252us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (18,911)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period | 50,679us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,427us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31,338us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period | $ 55,146us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 50,679us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 12,427us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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