$GBCI
GLACIER BANCORP, INC. Stock $gbci

$gbci Overview Financials Valuation SEC Filings Company Website

2024 Q4 Form 10-Q Financial Statement

#000086867124000094 Filed on October 31, 2024

Income Statement

Concept	2024 Q4	2024 Q3
Revenue		$289.6M
YoY Change		9.31%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$10.59M
YoY Change		16.37%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income		$62.22M
YoY Change		-3.05%
Income Tax		$11.17M
% Of Pretax Income		17.95%
Net Earnings		$51.06M
YoY Change		-2.65%
Net Earnings / Revenue		17.63%
Basic Earnings Per Share		$0.45
Diluted Earnings Per Share		$0.45
COMMON SHARES
Basic Shares Outstanding	113.4M shares	113.4M shares
Diluted Shares Outstanding		113.5M shares

Balance Sheet

Concept	2024 Q4	2024 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents		$987.8M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment		$467.0M
YoY Change		12.52%
Goodwill		$1.054B
YoY Change		6.92%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets		$125.4M
YoY Change		-38.51%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets		$28.21B
YoY Change		0.51%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable		$35.38M
YoY Change		-61.54%
Accrued Expenses		$40.64M
YoY Change		-9.68%
Deferred Revenue
YoY Change
Short-Term Debt		$1.832B
YoY Change		-56.8%
Long-Term Debt Due		$3.943M
YoY Change		-1.43%
Total Short-Term Liabilities		$1.867B
YoY Change		-57.39%
LONG-TERM LIABILITIES
Long-Term Debt		$217.2M
YoY Change		7.01%
Other Long-Term Liabilities		$361.8M
YoY Change		71.49%
Total Long-Term Liabilities		$579.1M
YoY Change		39.87%
TOTAL LIABILITIES
Total Short-Term Liabilities		$1.867B
Total Long-Term Liabilities		$579.1M
Total Liabilities		$24.96B
YoY Change		-0.91%
SHAREHOLDERS EQUITY
Retained Earnings		$1.059B
YoY Change		3.26%
Common Stock		$2.447B
YoY Change		4.21%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity		$3.245B
YoY Change
Total Liabilities & Shareholders Equity		$28.21B
YoY Change		0.51%

Cashflow Statement

Concept	2024 Q4	2024 Q3
OPERATING ACTIVITIES
Net Income		$51.06M
YoY Change		-2.65%
Depreciation, Depletion And Amortization		$10.59M
YoY Change		16.37%
Cash From Operating Activities		$150.1M
YoY Change		15.46%
INVESTING ACTIVITIES
Capital Expenditures		$9.197M
YoY Change		-43.58%
Acquisitions
YoY Change
Other Investing Activities		$223.2M
YoY Change		1277.96%
Cash From Investing Activities		$214.0M
YoY Change		-214133.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities		-177.1M
YoY Change		-136.07%
NET CHANGE
Cash From Operating Activities		150.1M
Cash From Investing Activities		214.0M
Cash From Financing Activities		-177.1M
Net Change In Cash		187.1M
YoY Change		-69.87%
FREE CASH FLOW
Cash From Operating Activities		$150.1M
Capital Expenditures		$9.197M
Free Cash Flow		$140.9M
YoY Change		23.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Address Address Line1 EntityAddressAddressLine1	49 Commons Loop
	dei	Entity Address City Or Town EntityAddressCityOrTown	Kalispell,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	MT
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	59901
	dei	City Area Code CityAreaCode	(406)
	dei	Local Phone Number LocalPhoneNumber	756-4200
	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
	dei	Trading Symbol TradingSymbol	GBCI
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2024Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	113397845	shares
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	246525000	usd
CY2024Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	645728000	usd
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	1107817000	usd
CY2024Q3	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	987833000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	1354342000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4436578000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4785719000	usd
CY2024Q3	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	46126000	usd
CY2023Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	15691000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	17181187000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16198082000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	205170000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	192757000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16976017000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16005325000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	31870000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	1053556000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	985393000	usd
CY2024Q3	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	188971000	usd
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	171101000	usd
CY2024Q3	us-gaap	Other Assets OtherAssets	309762000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	201132000	usd
CY2024Q3	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	46371000	usd
CY2023Q4	us-gaap	Assets Assets	27742629000	usd
CY2024Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	6407728000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	6022980000	usd
CY2024Q3	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	14307036000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	13906187000	usd
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1486850000	usd
CY2024Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1800000000	usd
CY2023Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	0	usd
CY2024Q3	gbci	Federal Reserve Bank Borrowings FederalReserveBankBorrowings	0	usd
CY2023Q4	gbci	Federal Reserve Bank Borrowings FederalReserveBankBorrowings	2740000000	usd
CY2024Q3	us-gaap	Other Borrowings OtherBorrowings	84168000	usd
CY2023Q4	us-gaap	Other Borrowings OtherBorrowings	81695000	usd
CY2024Q3	us-gaap	Subordinated Debt SubordinatedDebt	133065000	usd
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000	shares
CY2024Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000	shares
CY2024Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2024Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	234000000	shares
CY2024Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	234000000	shares
CY2024Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	1134000	usd
CY2023Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	1109000	usd
CY2024Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2447200000	usd
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2350104000	usd
CY2024Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1059022000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1043181000	usd
CY2024Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-262306000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-374113000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	3245050000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	3020281000	usd
CY2024Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	28205769000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	27742629000	usd
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	144697000	usd
	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	65636000	usd
	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	51508000	usd
CY2023Q3	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	173437000	usd
	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	566699000	usd
	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	493706000	usd
CY2024Q3	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	23188000	usd
CY2023Q3	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	19478000	usd
	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	65725000	usd
	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	54248000	usd
CY2024Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	289578000	usd
CY2023Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	264906000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	842814000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	744159000	usd
CY2024Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	70607000	usd
CY2023Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	54697000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	205655000	usd
CY2024Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	180231000	usd
CY2023Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	167054000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	513189000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	525226000	usd
CY2024Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8005000	usd
CY2023Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3539000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	19772000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11782000	usd
CY2024Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	172226000	usd
CY2023Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	163515000	usd
CY2024Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4223000	usd
CY2023Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2633000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	11213000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	8949000	usd
CY2024Q3	us-gaap	Noninterest Income NoninterestIncome	34704000	usd
CY2023Q3	us-gaap	Noninterest Income NoninterestIncome	30240000	usd
	us-gaap	Noninterest Income NoninterestIncome	96897000	usd
	us-gaap	Noninterest Income NoninterestIncome	87214000	usd
CY2024Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	85083000	usd
CY2023Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	77387000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	255306000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	237628000	usd
CY2024Q3	us-gaap	Occupancy Net OccupancyNet	11989000	usd
CY2023Q3	us-gaap	Occupancy Net OccupancyNet	10553000	usd
	us-gaap	Occupancy Net OccupancyNet	35466000	usd
	us-gaap	Occupancy Net OccupancyNet	33045000	usd
CY2024Q3	us-gaap	Advertising Expense AdvertisingExpense	4062000	usd
CY2023Q3	us-gaap	Advertising Expense AdvertisingExpense	4052000	usd
	us-gaap	Advertising Expense AdvertisingExpense	12407000	usd
	us-gaap	Advertising Expense AdvertisingExpense	12020000	usd
CY2024Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9196000	usd
CY2023Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	8730000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	27742000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	25241000	usd
CY2024Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	13000	usd
CY2023Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	15000	usd
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	187000	usd
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	41000	usd
CY2024Q3	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	5150000	usd
CY2023Q3	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	6060000	usd
	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	18304000	usd
	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	16277000	usd
CY2024Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3367000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2428000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9144000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7304000	usd
CY2024Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	25848000	usd
CY2023Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20351000	usd
CY2023Q3	us-gaap	Noninterest Expense NoninterestExpense	129576000	usd
	us-gaap	Noninterest Expense NoninterestExpense	437503000	usd
	us-gaap	Noninterest Expense NoninterestExpense	395162000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	62222000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	64179000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	152811000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	205496000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11167000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11734000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24421000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36885000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	51055000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	52445000	usd
	us-gaap	Net Income Loss NetIncomeLoss	128390000	usd
	us-gaap	Net Income Loss NetIncomeLoss	168611000	usd
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.14
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.52
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.13
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.52
CY2024Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.99
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.99
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110877534	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113093583	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110857788	shares
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113473107	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110886959	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113137861	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110882718	shares
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	51055000	usd
	us-gaap	Net Income Loss NetIncomeLoss	128390000	usd
	us-gaap	Net Income Loss NetIncomeLoss	168611000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	123403000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-93822000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	148998000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-45984000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	27000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	56000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-31000	usd
CY2024Q3	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Before Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossBeforeTax	-1161000	usd
CY2023Q3	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Before Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossBeforeTax	-1304000	usd
	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Before Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossBeforeTax	-3198000	usd
	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Before Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossBeforeTax	-4492000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	31171000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	38097000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-10478000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	93366000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-69138000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	114043000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-30983000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-57000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	654000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-442000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-2236000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-592000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	92345000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-69580000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	111807000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31575000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	143400000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-17135000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	240197000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	137036000	usd
CY2023Q2	us-gaap	Stockholders Equity StockholdersEquity	2926526000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	52445000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-69580000	usd
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
CY2023Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	36680000	usd
CY2023Q3	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1883000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	2874594000	usd
CY2024Q2	us-gaap	Stockholders Equity StockholdersEquity	3137445000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	51055000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	92345000	usd
CY2024Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
CY2024Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	37516000	usd
CY2024Q3	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1721000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	3245050000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2843305000	usd
	us-gaap	Net Income Loss NetIncomeLoss	168611000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31575000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.99
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	110048000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	4301000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	2874594000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	3020281000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.99
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-0519541
CY2024Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	342105000	usd
CY2024Q3	gbci	Property Plant And Equipment And Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	466977000	usd
CY2023Q4	gbci	Property Plant And Equipment And Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	421791000	usd
CY2024Q3	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	633000	usd
CY2024Q3	us-gaap	Interest Receivable InterestReceivable	114121000	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	94526000	usd
CY2024Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	125432000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	159070000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	52780000	usd
CY2024Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	98285000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	12755000	usd
CY2024Q3	us-gaap	Assets Assets	28205769000	usd
CY2024Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1831501000	usd
CY2024Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	144754000	usd
CY2024Q3	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	23118000	usd
CY2023Q3	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	18594000	usd
CY2024Q3	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	196901000	usd
CY2024Q3	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	14737000	usd
CY2023Q3	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	10972000	usd
CY2024Q3	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	22344000	usd
	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	50772000	usd
	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	26910000	usd
CY2024Q3	us-gaap	Interest Expense Other InterestExpenseOther	252000	usd
CY2023Q3	us-gaap	Interest Expense Other InterestExpenseOther	489000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	949000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	1428000	usd
CY2024Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1407000	usd
CY2023Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1465000	usd
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	4251000	usd
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	4308000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	493417000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	513444000	usd
CY2024Q3	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	20587000	usd
CY2023Q3	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	19304000	usd
	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	58572000	usd
	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	56042000	usd
CY2024Q3	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	4970000	usd
CY2023Q3	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	4322000	usd
	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	14153000	usd
	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	12451000	usd
CY2024Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4898000	usd
CY2023Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4046000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	12929000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	9974000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	78947000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	63606000	usd
CY2024Q3	us-gaap	Noninterest Expense NoninterestExpense	144708000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-23380000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	870000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	2540000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	1304000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	1244000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	3852000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	3331000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-340000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-148000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-746000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-199000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1021000	usd
	us-gaap	Net Income Loss NetIncomeLoss	128390000	usd
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	40901000	usd
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	24185000	usd
CY2023Q3	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	0	usd
CY2024Q3	gbci	Interest Expense Federal Reserve Bank Funding Short Term InterestExpenseFederalReserveBankFundingShortTerm	0	usd
CY2023Q3	gbci	Interest Expense Federal Reserve Bank Funding Short Term InterestExpenseFederalReserveBankFundingShortTerm	30229000	usd
	gbci	Interest Expense Federal Reserve Bank Funding Short Term InterestExpenseFederalReserveBankFundingShortTerm	27097000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	6981000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	3976000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1210000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	205170000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	189385000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	5095000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	3201000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	992000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	192271000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	192757000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	3000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	12406000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	3678000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	205170000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3502411000	usd
CY2023Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	1503000	usd
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	132943000	usd
CY2024Q3	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	35382000	usd
CY2023Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	125907000	usd
CY2024Q3	us-gaap	Other Liabilities OtherLiabilities	361839000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	225786000	usd
CY2024Q3	us-gaap	Liabilities Liabilities	24960719000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	24722348000	usd
CY2024Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2024Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2024Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	113394786	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	110888942	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	110888942	shares
CY2023Q3	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	53397000	usd
CY2023Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2024#OtherBorrowings
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2024-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity Registrant Name EntityRegistrantName	GLACIER BANCORP, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MT
CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3348698000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale And Held To Maturity Fair Value DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue	7785276000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity Fair Value DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue	8288130000	usd
CY2024Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2024Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	113394786	shares
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	98942000	usd
	gbci	Interest Expense Federal Reserve Bank Funding Short Term InterestExpenseFederalReserveBankFundingShortTerm	63160000	usd
CY2024Q3	us-gaap	Interest Expense Operating InterestExpenseOperating	109347000	usd
CY2023Q3	us-gaap	Interest Expense Operating InterestExpenseOperating	97852000	usd
	us-gaap	Interest Expense Operating InterestExpenseOperating	329625000	usd
	us-gaap	Interest Expense Operating InterestExpenseOperating	218933000	usd
CY2024Q3	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	26000	usd
CY2023Q3	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-65000	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	30000	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-202000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	52445000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	111807000	usd
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	112549000	usd
	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	92385000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	4736000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	3245050000	usd
	us-gaap	Net Income Loss NetIncomeLoss	128390000	usd
	us-gaap	Net Income Loss NetIncomeLoss	168611000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	19772000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11782000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-9609000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-11745000	usd
	gbci	Accretion Amortization Of Discounts And Premiums Business Combinations AccretionAmortizationOfDiscountsAndPremiumsBusinessCombinations	4980000	usd
	gbci	Accretion Amortization Of Discounts And Premiums Business Combinations AccretionAmortizationOfDiscountsAndPremiumsBusinessCombinations	2879000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	483494000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	332582000	usd
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	551051000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	12929000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	9974000	usd
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	30000	usd
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-202000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3391000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	2915000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	4376000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	4577000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	21557000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	20322000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1147000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	118000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9144000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7304000	usd
	gbci	Variable Interest Entities Investment Amortization VariableInterestEntitiesInvestmentAmortization	18955000	usd
	gbci	Variable Interest Entities Investment Amortization VariableInterestEntitiesInvestmentAmortization	15418000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	20939000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1632000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1764000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-91936000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	87543000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	6707000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2038000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	156040000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	349511000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	237502000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	29972000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	464028000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	479442000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	21252000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	150973000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	159502000	usd
	us-gaap	Proceeds From Collection Of Finance Receivables ProceedsFromCollectionOfFinanceReceivables	2816803000	usd
	us-gaap	Proceeds From Collection Of Finance Receivables ProceedsFromCollectionOfFinanceReceivables	2167746000	usd
	gbci	Payments For Loans Originated Or Acquired PaymentsForLoansOriginatedOrAcquired	3174085000	usd
	gbci	Payments For Loans Originated Or Acquired PaymentsForLoansOriginatedOrAcquired	3133352000	usd
	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	27340000	usd
	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	36492000	usd
	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	2183000	usd
	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	179000	usd
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	149488000	usd
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	628801000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	231075000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	558117000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	193000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1787000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	22342000	usd
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	107684000	usd
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	437304000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-282874000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-227255000	usd
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	340346000	usd
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	553780000	usd
	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-58500000	usd
	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-1800000000	usd
	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	usd
	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	2740000000	usd
	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	2740000000	usd
	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	0	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1800000000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	usd
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	2180000	usd
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-4196000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	75166000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	73485000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1458000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1799000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-959853000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1203462000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-366509000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1270099000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1354342000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	401995000	usd
CY2024Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	987833000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1672094000	usd
	us-gaap	Interest Paid Net InterestPaidNet	421560000	usd
	us-gaap	Interest Paid Net InterestPaidNet	131390000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	14012000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	17841000	usd
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	6000	usd
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	23000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	171000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	100000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	339000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1096000	usd
	gbci	Equity Investment Obtained In Exchange For Delayed Equity Contributions EquityInvestmentObtainedInExchangeForDelayedEquityContributions	15148000	usd
	gbci	Equity Investment Obtained In Exchange For Delayed Equity Contributions EquityInvestmentObtainedInExchangeForDelayedEquityContributions	34712000	usd
	us-gaap	Stock Issued1 StockIssued1	0	usd
	gbci	Cash Consideration For Outstanding Shares CashConsiderationForOutstandingShares	26009000	usd
	gbci	Cash Consideration For Outstanding Shares CashConsiderationForOutstandingShares	0	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	1180710000	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	0	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	1087555000	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	usd
	us-gaap	Use Of Estimates UseOfEstimates	Material estimates that are particularly susceptible to significant change include: 1) the determination of the allowance for credit losses (“ACL” or “allowance”) on loans; 2) the valuation of debt securities; 3) the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans; and 4) the evaluation of goodwill impairment. For the determination of the ACL on loans and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to the investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using independent party inputs.
CY2024Q3	gbci	Number Of Bank Divisions NumberOfBankDivisions	17	bankdivision
CY2024Q3	us-gaap	Restricted Cash RestrictedCash	21650000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	6981000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	5095000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	21138000	usd
CY2024Q3	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	1024000	usd
CY2023Q3	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-1556000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-1366000	usd
CY2024Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8005000	usd
CY2023Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3539000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	19772000	usd
	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease	0	usd
CY2024Q3	us-gaap	Capitalized Contract Cost Accumulated Impairment CapitalizedContractCostAccumulatedImpairment	0	usd
CY2023Q3	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	410000	usd
	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	250818000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	753000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	782000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	725000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
CY2024Q3	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	2310000	usd
CY2023Q3	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	4735000	usd
	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	8495000	usd
CY2024Q3	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	0	usd
CY2023Q3	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	1000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	0	usd
CY2023Q3	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	66000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	27000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	8364000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	19303000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	17181187000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	205170000	usd
CY2024Q3	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	-27749000	usd
CY2024Q3	us-gaap	Financing Receivable Unamortized Purchase Premium Discount FinancingReceivableUnamortizedPurchasePremiumDiscount	-36722000	usd
CY2024Q3	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	85533000	usd
	us-gaap	Financing Receivable Accrued Interest Writeoff FinancingReceivableAccruedInterestWriteoff	163000	usd
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	10020000	usd
CY2023Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1060000	usd
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3281000	usd
CY2024Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	207000	usd
CY2023Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	239000	usd
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	647000	usd
CY2024Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1302000	usd
CY2023Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1359000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	3929000	usd
CY2024Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	114000	usd
CY2023Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	151000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	347000	usd
CY2024Q3	us-gaap	Variable Lease Cost VariableLeaseCost	465000	usd
CY2023Q3	us-gaap	Variable Lease Cost VariableLeaseCost	410000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	1220000	usd
CY2023Q3	us-gaap	Sublease Income SubleaseIncome	9000	usd
	us-gaap	Sublease Income SubleaseIncome	30000	usd
CY2024Q3	us-gaap	Lease Cost LeaseCost	3168000	usd
CY2023Q3	us-gaap	Lease Cost LeaseCost	3210000	usd
	us-gaap	Lease Cost LeaseCost	9394000	usd
CY2024Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	967000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2883000	usd
CY2023Q2	us-gaap	Goodwill Goodwill	985393000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	985393000	usd
CY2024Q3	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	29794000	usd
CY2023Q3	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	68163000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	1053556000	usd
CY2023Q3	us-gaap	Goodwill Goodwill	985393000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	1053556000	usd
CY2023Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	40159000	usd
CY2023Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	12534000	usd
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	565000	usd
	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	1031000	usd
CY2024Q3	us-gaap	Servicing Asset ServicingAsset	1522822000	usd
CY2024Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	17317000	usd
CY2024Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	187428000	usd
	us-gaap	Affordable Housing Project Investment Write Down Amount AffordableHousingProjectInvestmentWriteDownAmount	0	usd
CY2024Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	5224000	usd
CY2023Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	3728000	usd
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	15612000	usd
CY2024Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	6812000	usd
CY2023Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	4981000	usd
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	20422000	usd
CY2024Q3	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	19839000	usd
CY2024Q3	gbci	Consulting Fees ConsultingFees	6440000	usd
CY2023Q3	gbci	Consulting Fees ConsultingFees	3697000	usd
	gbci	Consulting Fees ConsultingFees	16452000	usd
	gbci	Debit Card Expense DebitCardExpense	8682000	usd
	gbci	Loan Related Expenses LoanRelatedExpenses	5513000	usd
CY2024Q3	gbci	Telephone Expenses TelephoneExpenses	1482000	usd
CY2023Q3	gbci	Telephone Expenses TelephoneExpenses	1545000	usd
	gbci	Telephone Expenses TelephoneExpenses	4534000	usd
CY2024Q3	us-gaap	Business Development BusinessDevelopment	1526000	usd
CY2023Q3	us-gaap	Business Development BusinessDevelopment	1399000	usd
	us-gaap	Business Development BusinessDevelopment	4258000	usd
CY2024Q3	us-gaap	Postage Expense PostageExpense	1206000	usd
CY2023Q3	us-gaap	Postage Expense PostageExpense	1097000	usd
	us-gaap	Postage Expense PostageExpense	3639000	usd
CY2023Q3	us-gaap	Supplies Expense SuppliesExpense	798000	usd
	us-gaap	Supplies Expense SuppliesExpense	2357000	usd
	us-gaap	Legal Fees LegalFees	1163000	usd
CY2024Q3	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	586000	usd
CY2023Q3	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-37000	usd
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	3124000	usd
CY2024Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2663000	usd
CY2023Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2309000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	7770000	usd
CY2024Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	25848000	usd
CY2023Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20351000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	78947000	usd
CY2024Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	51055000	usd
CY2023Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	52445000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	168611000	usd
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110877534	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113093583	shares
CY2024Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	78349	shares
CY2023Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	9425	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	44278	shares
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113473107	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110886959	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	113137861	shares
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.14
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.13
CY2024Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	817	shares
CY2023Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	247104	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	95198	shares
	gbci	Fair Value Measurement Transfers From One Level To Another FairValueMeasurementTransfersFromOneLevelToAnother	0	usd
	dei	Entity Central Index Key EntityCentralIndexKey	0000868671
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	operatingsegment
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20240930#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20240930#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20240930#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20240930#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2023Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2024#OtherLiabilities
CY2024Q3	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2024#OtherBorrowings
CY2024Q3	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2024#OtherLiabilities
CY2024Q3	us-gaap	Hedged Asset Statement Of Financial Position Extensible Enumeration HedgedAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2024#DebtSecuritiesAvailableForSaleExcludingAccruedInterest
CY2023Q4	us-gaap	Hedged Asset Statement Of Financial Position Extensible Enumeration HedgedAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2024#DebtSecuritiesAvailableForSaleExcludingAccruedInterest
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113394758	shares
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	395216000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	13982000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	37798000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-210838000	usd
CY2024Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	37711000	usd
CY2023Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	36873000	usd
	us-gaap	Stock Issued1 StockIssued1	92385000	usd
	gbci	Maximum Period Of Original Maturity To Be Included In Cash And Cash Equivalents MaximumPeriodOfOriginalMaturityToBeIncludedInCashAndCashEquivalents	P3M
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	17440000	usd
CY2024Q3	gbci	Federal Reserve Balance Or Cash On Hand Required FederalReserveBalanceOrCashOnHandRequired	0	usd
	gbci	Minimum Period Past Due To Consider Loans As Delinquent MinimumPeriodPastDueToConsiderLoansAsDelinquent	P30D
	gbci	Minimum Period Past Due To Consider Loans As Non Accrual MinimumPeriodPastDueToConsiderLoansAsNonAccrual	P90D
	gbci	Financing Receivable Allowance For Credit Losses Forecasting Period FinancingReceivableAllowanceForCreditLossesForecastingPeriod	4	quarter
	gbci	Financing Receivable Allowance For Credit Losses Forecasting Period FinancingReceivableAllowanceForCreditLossesForecastingPeriod	4	quarter
	gbci	Financing Receivable Allowance For Credit Losses Number Of Components FinancingReceivableAllowanceForCreditLossesNumberOfComponents	2	component
	gbci	Minimum Period Past Due To Consider Loans As Non Accrual MinimumPeriodPastDueToConsiderLoansAsNonAccrual	P90D
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	16609000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-4827000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11782000	usd
	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease	0	usd
	gbci	Maximum Term Leases Will Be Considered Short Term MaximumTermLeasesWillBeConsideredShortTerm	P12M
	gbci	Maximum Period Up To Which Purchase Price Of Business Is Allocated To Assets Acquired And Liabilities Assumed MaximumPeriodUpToWhichPurchasePriceOfBusinessIsAllocatedToAssetsAcquiredAndLiabilitiesAssumed	P1Y
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	69973000	usd
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	65938000	usd
CY2023Q4	us-gaap	Capitalized Contract Cost Accumulated Impairment CapitalizedContractCostAccumulatedImpairment	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	4785172000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1039000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	349633000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4436578000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3348698000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	1874000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	270023000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3080549000	usd
CY2024Q3	gbci	Debt Securities Amortized Cost Basis DebtSecuritiesAmortizedCostBasis	8133870000	usd
CY2024Q3	gbci	Securities Gross Unrealized Gain Accumulated In Investments SecuritiesGrossUnrealizedGainAccumulatedInInvestments	2913000	usd
CY2024Q3	gbci	Securities Gross Unrealized Loss Accumulated In Investments SecuritiesGrossUnrealizedLossAccumulatedInInvestments	619656000	usd
CY2024Q3	gbci	Debt Securities Fair Value DebtSecuritiesFairValue	7517127000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	5283253000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	841000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	498375000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4785719000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3502411000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	2843000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	325060000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3180194000	usd
CY2023Q4	gbci	Debt Securities Amortized Cost Basis DebtSecuritiesAmortizedCostBasis	8785664000	usd
CY2023Q4	gbci	Securities Gross Unrealized Gain Accumulated In Investments SecuritiesGrossUnrealizedGainAccumulatedInInvestments	3684000	usd
CY2023Q4	gbci	Securities Gross Unrealized Loss Accumulated In Investments SecuritiesGrossUnrealizedLossAccumulatedInInvestments	823435000	usd
CY2023Q4	gbci	Debt Securities Fair Value DebtSecuritiesFairValue	7965913000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	56222000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	55073000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling Within One Year DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingWithinOneYear	9139000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	9133000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	787336000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	758562000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling After One Through Five Years DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingAfterOneThroughFiveYears	938197000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	894304000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	16296000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	15732000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling After5 Through10 Years DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingAfter5Through10Years	189027000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	183962000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	37376000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	35220000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling After10 Years DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingAfter10Years	1351759000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	1186286000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	897230000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	864587000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate	2488122000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	2273685000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	3887942000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	3571991000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Without Single Maturity Date DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate	860576000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	806864000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	4785172000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4436578000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3348698000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3080549000	usd
CY2024Q3	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	77099000	usd
	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	31695000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	145000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	725000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	176000	usd
	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	15205000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	10000	usd
CY2024Q3	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	2000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	181000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	632	security
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	21045000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	408000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	4349361000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	349225000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4370406000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	349633000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	713	security
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	29403000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	370000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	4679701000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	498005000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4709104000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	498375000	usd
CY2024Q3	gbci	Number Of Credit Rating Categories Highest NumberOfCreditRatingCategoriesHighest	4	creditratingcategory
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	9319000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2024Q3	gbci	Number Of Credit Rating Categories Highest NumberOfCreditRatingCategoriesHighest	4	creditratingcategory
CY2023Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	16990000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16198082000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	192757000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16976017000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16005325000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	-25577000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Purchase Premium Discount FinancingReceivableUnamortizedPurchasePremiumDiscount	-13802000	usd
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	67362000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	200955000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	21138000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	182283000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	16609000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	10284000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	3663000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	192271000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	17181187000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16198082000	usd
	us-gaap	Financing Receivable Accrued Interest Writeoff FinancingReceivableAccruedInterestWriteoff	108000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	5702000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	42200000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	53638000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	53744000	usd
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	0	usd
CY2024Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	638000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	5361000	usd
CY2024Q3	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	76000	usd
CY2023Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	98000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Modified Past12 Months FinancingReceivableExcludingAccruedInterestModifiedPast12Months	53638000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	1901000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Modified Past12 Months FinancingReceivableExcludingAccruedInterestModifiedPast12Months	53744000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	2169000	usd
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	31077000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	31222000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	6940000	usd
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	21057000	usd
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	37111000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	24282000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	40781000	usd
CY2024Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	22257000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	40642000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	25116000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	44319000	usd
CY2024Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y
CY2024Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y
CY2024Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.036
CY2024Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.037
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.036
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.037
CY2024Q3	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	4665000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	4560000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	4679000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	4690000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	4688000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	4494000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	1614000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	3932000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	596000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	3526000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	10697000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	34507000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	26939000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	55709000	usd
CY2024Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3943000	usd
CY2024Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3128000	usd
CY2024Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	18314000	usd
CY2024Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	37514000	usd
CY2024Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	22257000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	40642000	usd
CY2024Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4682000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	15067000	usd
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1090000	usd
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3118000	usd
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	723000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	4243000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	528000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	1262000	usd
CY2024Q3	us-gaap	Sublease Income SubleaseIncome	10000	usd
	us-gaap	Sublease Income SubleaseIncome	32000	usd
	us-gaap	Lease Cost LeaseCost	9842000	usd
CY2024Q3	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	207000	usd
CY2024Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	874000	usd
CY2023Q3	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	239000	usd
CY2023Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	892000	usd
CY2023Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	892000	usd
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	647000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	2564000	usd
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	723000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	2714000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2633000	usd
CY2024Q2	us-gaap	Goodwill Goodwill	1023762000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	985393000	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2023Q3	us-gaap	Goodwill Goodwill	985393000	usd
CY2024Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	40159000	usd
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	13488000	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	434000	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	1388000	usd
CY2024Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	12068000	usd
CY2023Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	12534000	usd
CY2023Q4	us-gaap	Servicing Asset ServicingAsset	1570834000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	18000000	usd
CY2023Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	83962000	usd
	us-gaap	Affordable Housing Project Investment Write Down Amount AffordableHousingProjectInvestmentWriteDownAmount	0	usd
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	11636000	usd
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	15552000	usd
CY2024Q3	us-gaap	Hedged Asset Fair Value Hedge HedgedAssetFairValueHedge	3354388000	usd
CY2023Q4	us-gaap	Hedged Asset Fair Value Hedge HedgedAssetFairValueHedge	3807239000	usd
CY2023Q4	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	17988000	usd
	gbci	Consulting Fees ConsultingFees	12863000	usd
CY2024Q3	gbci	Debit Card Expense DebitCardExpense	3959000	usd
CY2023Q3	gbci	Debit Card Expense DebitCardExpense	2955000	usd
	gbci	Debit Card Expense DebitCardExpense	10841000	usd
CY2024Q3	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	1916000	usd
CY2023Q3	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	279000	usd
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	9424000	usd
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	842000	usd
CY2024Q3	gbci	Loan Related Expenses LoanRelatedExpenses	1922000	usd
CY2023Q3	gbci	Loan Related Expenses LoanRelatedExpenses	2032000	usd
	gbci	Loan Related Expenses LoanRelatedExpenses	5856000	usd
CY2024Q3	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	1131000	usd
CY2023Q3	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	1603000	usd
	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	5293000	usd
	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	5349000	usd
CY2024Q3	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	1617000	usd
CY2023Q3	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	1480000	usd
	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	4651000	usd
	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	4727000	usd
	gbci	Telephone Expenses TelephoneExpenses	4599000	usd
CY2024Q3	gbci	Deposit Related Expenses DepositRelatedExpenses	1039000	usd
CY2023Q3	gbci	Deposit Related Expenses DepositRelatedExpenses	713000	usd
	gbci	Deposit Related Expenses DepositRelatedExpenses	4374000	usd
	gbci	Deposit Related Expenses DepositRelatedExpenses	2429000	usd
	us-gaap	Business Development BusinessDevelopment	3929000	usd
	us-gaap	Postage Expense PostageExpense	3223000	usd
CY2024Q3	us-gaap	Supplies Expense SuppliesExpense	867000	usd
	us-gaap	Supplies Expense SuppliesExpense	2334000	usd
CY2024Q3	us-gaap	Legal Fees LegalFees	357000	usd
CY2023Q3	us-gaap	Legal Fees LegalFees	276000	usd
	us-gaap	Legal Fees LegalFees	1314000	usd
CY2024Q3	gbci	Accounting Fees AccountingFees	309000	usd
CY2023Q3	gbci	Accounting Fees AccountingFees	131000	usd
	gbci	Accounting Fees AccountingFees	1308000	usd
	gbci	Accounting Fees AccountingFees	1157000	usd
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-23000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	6773000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	63606000	usd
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-32466000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-31575000	usd
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	112356000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	111807000	usd
CY2024Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	51055000	usd
CY2023Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	52445000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	128390000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	128390000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	168611000	usd
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	113394758	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110857788	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	24930	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110882718	shares
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.52
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.52
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	222710	shares
	gbci	Fair Value Measurement Transfers From One Level To Another FairValueMeasurementTransfersFromOneLevelToAnother	0	usd
CY2024Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

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0000868671-24-000094-index.html	Edgar Link	pending
0000868671-24-000094.txt	Edgar Link	pending
0000868671-24-000094-xbrl.zip	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
gbci-09302024xex311.htm	Edgar Link	pending
gbci-09302024xex312.htm	Edgar Link	pending
gbci-09302024xex32.htm	Edgar Link	pending
gbci-20240930.htm	Edgar Link	pending
gbci-20240930.xsd	Edgar Link	pending
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gbci-20240930_lab.xml	Edgar Link	unprocessable
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gbci-20240930_cal.xml	Edgar Link	unprocessable
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$GBCI
GLACIER BANCORP, INC. Stock $gbci

2024 Q4 Form 10-Q Financial Statement

#000086867124000094 Filed on October 31, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GBCI GLACIER BANCORP, INC. Stock $gbci

2024 Q4 Form 10-Q Financial Statement

#000086867124000094 Filed on October 31, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GBCI
GLACIER BANCORP, INC. Stock $gbci