$GBCI
GLACIER BANCORP, INC. Stock $gbci

$gbci Overview Financials Valuation SEC Filings Company Website

2022 Q3 Form 10-Q Financial Statement

#000086867122000077 Filed on August 02, 2022

Income Statement

Concept	2022 Q3	2022 Q2	2022 Q1
Revenue	$214.4M	$199.6M	$190.5M
YoY Change	28.58%	24.81%	17.93%
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	$9.449M	$8.897M	$8.600M
YoY Change	22.71%	17.07%	10.26%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$9.075M	$6.199M	$4.961M
YoY Change	119.84%	38.15%	4.66%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$97.33M	$93.73M	$81.78M
YoY Change	5.12%	-2.93%	-18.47%
Income Tax	$17.99M	$17.34M	$13.98M
% Of Pretax Income	18.49%	18.5%	17.1%
Net Earnings	$79.34M	$76.39M	$67.80M
YoY Change	4.92%	-1.59%	-16.1%
Net Earnings / Revenue	37.0%	38.27%	35.58%
Basic Earnings Per Share	$0.72	$0.69	$0.61
Diluted Earnings Per Share	$715.8K	$0.69	$0.61
COMMON SHARES
Basic Shares Outstanding	110.8M shares	110.8M shares	110.7M shares
Diluted Shares Outstanding	110.8M shares	110.8M shares	110.8M shares

Balance Sheet

Concept	2022 Q3	2022 Q2	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$425.2M	$415.4M	$436.8M
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	$395.6M	$386.2M	$373.0M
YoY Change	25.2%	22.21%	15.71%
Goodwill	$985.4M	$985.4M	$985.4M
YoY Change	91.71%	91.71%	91.71%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$204.4M	$147.3M	$120.0M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$26.73B	$26.69B	$26.10B
YoY Change	25.42%	30.27%	32.02%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.740M	$2.334M	$2.000M
YoY Change	37.0%	16.7%	-33.33%
Accrued Expenses	$47.26M	$49.16M	$48.00M
YoY Change	-1.53%	2.42%	-2.04%
Deferred Revenue
YoY Change
Short-Term Debt	$887.5M	$968.2M	$958.0M
YoY Change	-14.75%	-2.69%	-3.91%
Long-Term Debt Due	$3.835M	$1.894M	$0.00
YoY Change
Total Short-Term Liabilities	$53.84M	$53.39M	$50.00M
YoY Change	7.68%	6.78%	-3.85%
LONG-TERM LIABILITIES
Long-Term Debt	$210.4M	$197.0M	$190.0M
YoY Change	26.75%	18.68%	14.46%
Other Long-Term Liabilities	$275.3M	$211.5M	$190.0M
YoY Change	67.88%	36.44%	24.18%
Total Long-Term Liabilities	$485.7M	$408.5M	$380.0M
YoY Change	47.19%	27.26%	19.12%
TOTAL LIABILITIES
Total Short-Term Liabilities	$53.84M	$53.39M	$50.00M
Total Long-Term Liabilities	$485.7M	$408.5M	$380.0M
Total Liabilities	$23.96B	$23.79B	$23.17B
YoY Change	26.6%	31.21%	32.57%
SHAREHOLDERS EQUITY
Retained Earnings	$923.9M	$881.2M	$841.5M
YoY Change	13.92%	15.03%	17.02%
Common Stock	$2.342B	$2.341B	$2.339B
YoY Change	56.38%	56.44%	56.44%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.772B	$2.896B	$2.934B
YoY Change
Total Liabilities & Shareholders Equity	$26.73B	$26.69B	$26.10B
YoY Change	25.42%	30.27%	32.02%

Cashflow Statement

Concept	2022 Q3	2022 Q2	2022 Q1
OPERATING ACTIVITIES
Net Income	$79.34M	$76.39M	$67.80M
YoY Change	4.92%	-1.59%	-16.1%
Depreciation, Depletion And Amortization	$9.449M	$8.897M	$8.600M
YoY Change	22.71%	17.07%	10.26%
Cash From Operating Activities	$134.1M	$138.3M	$78.36M
YoY Change	5.41%	-2.9%	-46.96%
INVESTING ACTIVITIES
Capital Expenditures	-$4.213M	-$8.796M	-$3.900M
YoY Change	0.31%		143.75%
Acquisitions
YoY Change
Other Investing Activities	-$223.2M	-$710.0M	-$452.4M
YoY Change	-84.64%	-2.28%	-61.57%
Cash From Investing Activities	-$227.4M	-$718.8M	-$456.3M
YoY Change	-84.4%	-0.85%	-61.29%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	103.1M	559.1M	$377.0M
YoY Change	-86.39%	-10.59%	-70.46%
NET CHANGE
Cash From Operating Activities	134.1M	138.3M	$78.36M
Cash From Investing Activities	-227.4M	-718.8M	-$456.3M
Cash From Financing Activities	103.1M	559.1M	$377.0M
Net Change In Cash	9.806M	-21.38M	-$881.0K
YoY Change	-101.71%	-149.95%	-100.36%
FREE CASH FLOW
Cash From Operating Activities	$134.1M	$138.3M	$78.36M
Capital Expenditures	-$4.213M	-$8.796M	-$3.900M
Free Cash Flow	$138.3M	$147.1M	$82.26M
YoY Change	5.25%		-44.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000868671
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	operatingsegment
CY2022Q2	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20220630#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20220630#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20220630#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.glacierbancorp.com/20220630#PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2022Q2	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilities
CY2021Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilities
CY2022Q2	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherBorrowings
CY2021Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherBorrowings
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-18911
	dei	Entity Registrant Name EntityRegistrantName	GLACIER BANCORP, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MT
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-0519541
	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
CY2022Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	110765429	shares
CY2022Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	293541000	usd
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	198087000	usd
CY2022Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	121865000	usd
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	239599000	usd
CY2022Q2	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	415406000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	437686000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6209199000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9170849000	usd
CY2022Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3788486000	usd
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1199164000	usd
CY2022Q2	us-gaap	Debt Securities DebtSecurities	9997685000	usd
CY2021Q4	us-gaap	Debt Securities DebtSecurities	10370013000	usd
CY2022Q2	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	33837000	usd
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	60797000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	14399755000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	13432031000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172963000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172665000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	14226792000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	13259366000	usd
CY2022Q2	gbci	Property Plant And Equipment And Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	386198000	usd
CY2021Q4	gbci	Property Plant And Equipment And Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	372597000	usd
CY2022Q2	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	379000	usd
CY2021Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	18000	usd
CY2022Q2	us-gaap	Interest Receivable InterestReceivable	80339000	usd
CY2021Q4	us-gaap	Interest Receivable InterestReceivable	76673000	usd
CY2022Q2	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	147263000	usd
CY2021Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	27693000	usd
CY2022Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	46930000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	52259000	usd
CY2022Q2	us-gaap	Goodwill Goodwill	985393000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	985393000	usd
CY2022Q2	gbci	Nonmarketable Securities Equity Securities NonmarketableSecuritiesEquitySecurities	33215000	usd
CY2021Q4	gbci	Nonmarketable Securities Equity Securities NonmarketableSecuritiesEquitySecurities	10020000	usd
CY2022Q2	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	168231000	usd
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	167671000	usd
CY2022Q2	us-gaap	Other Assets OtherAssets	168337000	usd
CY2021Q4	us-gaap	Other Assets OtherAssets	120459000	usd
CY2022Q2	us-gaap	Assets Assets	26690005000	usd
CY2021Q4	us-gaap	Assets Assets	25940645000	usd
CY2022Q2	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	8061304000	usd
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	7779288000	usd
CY2022Q2	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	13722379000	usd
CY2021Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	13557961000	usd
CY2022Q2	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	968197000	usd
CY2021Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1020794000	usd
CY2022Q2	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	580000000	usd
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	0	usd
CY2022Q2	us-gaap	Other Borrowings OtherBorrowings	66200000	usd
CY2021Q4	us-gaap	Other Borrowings OtherBorrowings	44094000	usd
CY2022Q2	us-gaap	Subordinated Debt SubordinatedDebt	132701000	usd
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	132620000	usd
CY2022Q2	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	2334000	usd
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	2409000	usd
CY2022Q2	us-gaap	Other Liabilities OtherLiabilities	260651000	usd
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	225857000	usd
CY2022Q2	us-gaap	Liabilities Liabilities	23793766000	usd
CY2021Q4	us-gaap	Liabilities Liabilities	22763023000	usd
CY2022Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000	shares
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000	shares
CY2022Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2022Q2	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2022Q2	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	234000000	shares
CY2022Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	234000000	shares
CY2022Q2	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	1108000	usd
CY2021Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	1107000	usd
CY2022Q2	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2341097000	usd
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2338814000	usd
CY2022Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	881246000	usd
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	810342000	usd
CY2022Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-327212000	usd
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	27359000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	2896239000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	3177622000	usd
CY2022Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	26690005000	usd
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	25940645000	usd
CY2022Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	110766287	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	110687533	shares
CY2022Q2	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	42841000	usd
CY2021Q2	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	28730000	usd
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	81495000	usd
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	56036000	usd
CY2022Q2	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	13026000	usd
CY2021Q2	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	9541000	usd
	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	28541000	usd
	us-gaap	Interest And Fee Income Loans Consumer Real Estate InterestAndFeeIncomeLoansConsumerRealEstate	19687000	usd
CY2022Q2	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	131259000	usd
CY2021Q2	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	110829000	usd
	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	255815000	usd
	us-gaap	Interest And Fee Income Loans Commercial InterestAndFeeIncomeLoansCommercial	224370000	usd
CY2022Q2	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	12511000	usd
CY2021Q2	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	10856000	usd
	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	24302000	usd
	us-gaap	Interest And Fee Income Loans Other Consumer InterestAndFeeIncomeLoansOtherConsumer	21415000	usd
CY2022Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	199637000	usd
CY2021Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	159956000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	390153000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	321508000	usd
CY2022Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3141000	usd
CY2021Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2804000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	6605000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	5818000	usd
CY2022Q2	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	367000	usd
CY2021Q2	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	651000	usd
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	760000	usd
	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1340000	usd
CY2022Q2	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	1298000	usd
CY2021Q2	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	0	usd
	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	1310000	usd
	gbci	Interest Expense Federal Home Loan Bank Advance InterestExpenseFederalHomeLoanBankAdvance	0	usd
CY2022Q2	us-gaap	Interest Expense Other InterestExpenseOther	264000	usd
CY2021Q2	us-gaap	Interest Expense Other InterestExpenseOther	177000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	484000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	351000	usd
CY2022Q2	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1129000	usd
CY2021Q2	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	855000	usd
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	2001000	usd
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	1718000	usd
CY2022Q2	us-gaap	Interest Expense InterestExpense	6199000	usd
CY2021Q2	us-gaap	Interest Expense InterestExpense	4487000	usd
	us-gaap	Interest Expense InterestExpense	11160000	usd
	us-gaap	Interest Expense InterestExpense	9227000	usd
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	193438000	usd
CY2021Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	155469000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	378993000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	312281000	usd
CY2022Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-1533000	usd
CY2021Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-5653000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5498000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-5605000	usd
CY2022Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	194971000	usd
CY2021Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	161122000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	373495000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	317886000	usd
CY2022Q2	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	17309000	usd
CY2021Q2	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	13795000	usd
	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	34420000	usd
	gbci	Service Charges And Other Fees ServiceChargesAndOtherFees	26587000	usd
CY2022Q2	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	3850000	usd
CY2021Q2	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	2923000	usd
	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	7405000	usd
	gbci	Miscellaneous Loan Fees And Charges MiscellaneousLoanFeesAndCharges	5701000	usd
CY2022Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4996000	usd
CY2021Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	16106000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	14011000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	37730000	usd
CY2022Q2	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-260000	usd
CY2021Q2	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-61000	usd
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	186000	usd
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	223000	usd
CY2022Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2385000	usd
CY2021Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2759000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5821000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5402000	usd
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	28280000	usd
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	35522000	usd
	us-gaap	Noninterest Income NoninterestIncome	61843000	usd
	us-gaap	Noninterest Income NoninterestIncome	75643000	usd
CY2022Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	79803000	usd
CY2021Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	64109000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	158877000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	126577000	usd
CY2022Q2	us-gaap	Occupancy Net OccupancyNet	10766000	usd
CY2021Q2	us-gaap	Occupancy Net OccupancyNet	9208000	usd
	us-gaap	Occupancy Net OccupancyNet	21730000	usd
	us-gaap	Occupancy Net OccupancyNet	18723000	usd
CY2022Q2	us-gaap	Advertising Expense AdvertisingExpense	3766000	usd
CY2021Q2	us-gaap	Advertising Expense AdvertisingExpense	2906000	usd
	us-gaap	Advertising Expense AdvertisingExpense	6998000	usd
	us-gaap	Advertising Expense AdvertisingExpense	5277000	usd
CY2022Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	7553000	usd
CY2021Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5661000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	15028000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	10867000	usd
CY2022Q2	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	6000	usd
CY2021Q2	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	48000	usd
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	6000	usd
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	60000	usd
CY2022Q2	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	3085000	usd
CY2021Q2	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	1702000	usd
	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	6140000	usd
	gbci	General Insurance And Federal Deposit Insurance Corporation Premium Expense GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense	3581000	usd
CY2022Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2665000	usd
CY2021Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2488000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5329000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4976000	usd
CY2022Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	21877000	usd
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13960000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	45721000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	26606000	usd
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	129521000	usd
CY2021Q2	us-gaap	Noninterest Expense NoninterestExpense	100082000	usd
	us-gaap	Noninterest Expense NoninterestExpense	259829000	usd
	us-gaap	Noninterest Expense NoninterestExpense	196667000	usd
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	93730000	usd
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	96562000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175509000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196862000	usd
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17338000	usd
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18935000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31322000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38433000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	76392000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	77627000	usd
	us-gaap	Net Income Loss NetIncomeLoss	144187000	usd
	us-gaap	Net Income Loss NetIncomeLoss	158429000	usd
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.66
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.30
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.32
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.66
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.63
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110765379	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	95505877	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110745017	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	95485839	shares
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110794982	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	95580904	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110799368	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	95565591	shares
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	76392000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	77627000	usd
	us-gaap	Net Income Loss NetIncomeLoss	144187000	usd
	us-gaap	Net Income Loss NetIncomeLoss	158429000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-108253000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	15073000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-477977000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-69670000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	87000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	46000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	765000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	372000	usd
CY2022Q2	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Before Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossBeforeTax	-1186000	usd
CY2021Q2	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Before Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossBeforeTax	803000	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	-404000	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	858000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-27078000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3595000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-120876000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-17916000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-80076000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	10629000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-357462000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-52984000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	903000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-144000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	3870000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	449000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	2000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	0	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	2000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	0	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	228000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-37000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	977000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-52648000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	113000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	673000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-107000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2891000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	336000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-79403000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10522000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-354571000	usd
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-3011000	usd
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	88149000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-210384000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	105781000	usd
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	2295385000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	77627000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10522000	usd
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.32
CY2021Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30629000	usd
CY2021Q2	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1050000	usd
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	2353955000	usd
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	2934193000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	76392000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-79403000	usd
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
CY2022Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	36635000	usd
CY2022Q2	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2022Q2	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1692000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	2896239000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2307041000	usd
	us-gaap	Net Income Loss NetIncomeLoss	158429000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-52648000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.63
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	60303000	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	1436000	usd
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	2353955000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	3177622000	usd
	us-gaap	Net Income Loss NetIncomeLoss	144187000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-354571000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.66
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	73283000	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	2284000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	2896239000	usd
	us-gaap	Net Income Loss NetIncomeLoss	144187000	usd
	us-gaap	Net Income Loss NetIncomeLoss	158429000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5498000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-5605000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-17854000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-19615000	usd
	gbci	Accretion Amortization Of Discounts And Premiums Business Combinations AccretionAmortizationOfDiscountsAndPremiumsBusinessCombinations	-7070000	usd
	gbci	Accretion Amortization Of Discounts And Premiums Business Combinations AccretionAmortizationOfDiscountsAndPremiumsBusinessCombinations	-4113000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	492225000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	827653000	usd
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	545318000	usd
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	976517000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	14011000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	37730000	usd
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	186000	usd
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	223000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1827000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1352000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	3081000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	2408000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	12168000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	10446000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	247000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5329000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4976000	usd
	gbci	Variable Interest Entities Investment Amortization VariableInterestEntitiesInvestmentAmortization	8600000	usd
	gbci	Variable Interest Entities Investment Amortization VariableInterestEntitiesInvestmentAmortization	6474000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3666000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-5045000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	24304000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	13239000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-75000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-11017000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3856000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-872000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2351093000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	216666000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	290085000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	668563000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	611077000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	410032000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	100111000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	6360000	usd
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	482727000	usd
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	usd
	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections1 ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections1	3266467000	usd
	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections1 ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections1	3281147000	usd
	gbci	Payments For Loans Originated Or Acquired PaymentsForLoansOriginatedOrAcquired	4256894000	usd
	gbci	Payments For Loans Originated Or Acquired PaymentsForLoansOriginatedOrAcquired	3446582000	usd
	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	12696000	usd
	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-1435000	usd
	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	46000	usd
	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	2679000	usd
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	71836000	usd
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	3000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	94998000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1304000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2112000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	26035000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	10711000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1175055000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1903573000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	446927000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1963419000	usd
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-52597000	usd
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-9382000	usd
	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	0	usd
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	11060000	usd
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-7012000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	47851000	usd
	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	580000000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	44142000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1430000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1495000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	165000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	936109000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1901553000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-22280000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	288065000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	437686000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	633142000	usd
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	415406000	usd
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	921207000	usd
	us-gaap	Interest Paid Net InterestPaidNet	11235000	usd
	us-gaap	Interest Paid Net InterestPaidNet	10099000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	26710000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	49663000	usd
	us-gaap	Transfer Of Investments TransferOfInvestments	2154475000	usd
	us-gaap	Transfer Of Investments TransferOfInvestments	844020000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	406000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1459000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11805000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	720000	usd
	gbci	Dividends Declared But Not Paid During The Period DividendsDeclaredButNotPaidDuringThePeriod	36730000	usd
	gbci	Dividends Declared But Not Paid During The Period DividendsDeclaredButNotPaidDuringThePeriod	30697000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	2991000	usd
CY2022Q2	gbci	Number Of Bank Divisions NumberOfBankDivisions	17	bankdivision
CY2022Q2	gbci	Federal Reserve Balance Or Cash On Hand Required FederalReserveBalanceOrCashOnHandRequired	0	usd
	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
CY2022Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-1353000	usd
CY2021Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-5723000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-5234000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-180000	usd
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	70000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	2507000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-371000	usd
CY2022Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-1533000	usd
CY2021Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-5653000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5498000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-5605000	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	0	usd
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	0	usd
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	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 Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	39174000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	28901000	usd
CY2021Q4	us-gaap	Capitalized Contract Cost Accumulated Impairment CapitalizedContractCostAccumulatedImpairment	0	usd
CY2022Q2	us-gaap	Capitalized Contract Cost Accumulated Impairment CapitalizedContractCostAccumulatedImpairment	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	6636833000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	4673000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	432307000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	6209199000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	3788486000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	990000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	329717000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3459759000	usd
CY2022Q2	gbci	Debt Securities Amortized Cost Basis DebtSecuritiesAmortizedCostBasis	10425319000	usd
CY2022Q2	gbci	Securities Gross Unrealized Gain Accumulated In Investments SecuritiesGrossUnrealizedGainAccumulatedInInvestments	5663000	usd
CY2022Q2	gbci	Securities Gross Unrealized Loss Accumulated In Investments SecuritiesGrossUnrealizedLossAccumulatedInInvestments	762024000	usd
CY2022Q2	gbci	Debt Securities Fair Value DebtSecuritiesFairValue	9668958000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	9175423000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	68117000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	72691000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	9170849000	usd
CY2021Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	1199164000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	22878000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	1159000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1220883000	usd
CY2021Q4	gbci	Debt Securities Amortized Cost Basis DebtSecuritiesAmortizedCostBasis	10374587000	usd
CY2021Q4	gbci	Securities Gross Unrealized Gain Accumulated In Investments SecuritiesGrossUnrealizedGainAccumulatedInInvestments	90995000	usd
CY2021Q4	gbci	Securities Gross Unrealized Loss Accumulated In Investments SecuritiesGrossUnrealizedLossAccumulatedInInvestments	73850000	usd
CY2021Q4	gbci	Debt Securities Fair Value DebtSecuritiesFairValue	10391732000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	51941000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	52177000	usd
CY2022Q2	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	1424000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	1430000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	926147000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	873802000	usd
CY2022Q2	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	521133000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	491108000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	165413000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	164726000	usd
CY2022Q2	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	528160000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	496150000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	207432000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	203958000	usd
CY2022Q2	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	1446834000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	1237451000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1350933000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	1294663000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate	2497551000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	2226139000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	5285900000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	4914536000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Without Single Maturity Date DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate	1290935000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	1233620000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	6636833000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	6209199000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	3788486000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3459759000	usd
CY2022Q2	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	18146000	usd
CY2021Q2	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	22361000	usd
	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	71266000	usd
	gbci	Proceeds From Sales And Calls Of Debt Securities Available For Sale ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale	76697000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	87000	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	69000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	780000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	438000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	23000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	15000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	66000	usd
CY2022Q2	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	9370000	usd
CY2021Q2	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	2230000	usd
	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	22345000	usd
	gbci	Heldto Maturity Securities Gross Realized Gains Losses Sale Proceeds HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds	6360000	usd
CY2022Q2	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	14000	usd
CY2021Q2	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	0	usd
	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	29000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Gain HeldtoMaturitySecuritiesSoldSecurityRealizedGain	0	usd
CY2022Q2	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	361000	usd
CY2021Q2	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	107000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	608000	usd
	gbci	Heldto Maturity Securities Sold Security Realized Loss HeldtoMaturitySecuritiesSoldSecurityRealizedLoss	149000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	823	security
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	4932966000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	354315000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	880773000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	77992000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	5813739000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	432307000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	263	security
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	7231306000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	67190000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	187060000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	5501000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	7418366000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	72691000	usd
	gbci	Available For Sale Securities In Unrealized Loss Positions Severity Rate AvailableForSaleSecuritiesInUnrealizedLossPositionsSeverityRate	0.05
CY2022Q2	gbci	Number Of Credit Rating Categories Highest NumberOfCreditRatingCategoriesHighest	4	security
CY2022Q2	gbci	Interest Receivable Available For Sale Debt Securities InterestReceivableAvailableForSaleDebtSecurities	14453000	usd
CY2021Q4	gbci	Interest Receivable Available For Sale Debt Securities InterestReceivableAvailableForSaleDebtSecurities	18788000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2022Q2	gbci	Number Of Credit Rating Categories Highest NumberOfCreditRatingCategoriesHighest	4	security
CY2022Q2	gbci	Interest Receivable Held To Maturity Debt Securities InterestReceivableHeldToMaturityDebtSecurities	15697000	usd
CY2021Q4	gbci	Interest Receivable Held To Maturity Debt Securities InterestReceivableHeldToMaturityDebtSecurities	8737000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2021Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	14399755000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	13432031000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172963000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172665000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	14226792000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	13259366000	usd
CY2022Q2	gbci	Unamortized Loan Origination Costs Fees UnamortizedLoanOriginationCostsFees	-23210000	usd
CY2021Q4	gbci	Unamortized Loan Origination Costs Fees UnamortizedLoanOriginationCostsFees	-21667000	usd
CY2022Q2	gbci	Unamortized Discounts And Premiums On Loans UnamortizedDiscountsAndPremiumsOnLoans	-21028000	usd
CY2021Q4	gbci	Unamortized Discounts And Premiums On Loans UnamortizedDiscountsAndPremiumsOnLoans	-25166000	usd
CY2022Q2	gbci	Interest Receivable Financing Receivable InterestReceivableFinancingReceivable	50166000	usd
CY2021Q4	gbci	Interest Receivable Financing Receivable InterestReceivableFinancingReceivable	49133000	usd
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	176159000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-1353000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	4346000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	2503000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172963000	usd
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	156446000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-5723000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	1700000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	151448000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	2425000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172665000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	2991000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	7040000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	4347000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	172963000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	158243000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-5234000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	5946000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	4385000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	151448000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	14399755000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	13432031000	usd
	gbci	Financing Receivable Nonaccrual Interest Income Reversed FinancingReceivableNonaccrualInterestIncomeReversed	801000	usd
	gbci	Financing Receivable Nonaccrual Interest Income Reversed FinancingReceivableNonaccrualInterestIncomeReversed	447000	usd
CY2022Q2	gbci	Collateral Dependent Loans CollateralDependentLoans	50485000	usd
CY2021Q4	gbci	Collateral Dependent Loans CollateralDependentLoans	63425000	usd
CY2022Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2	loan
CY2022Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1932000	usd
CY2022Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1932000	usd
CY2022Q2	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
CY2022Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	usd
CY2021Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	loan
CY2021Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	615000	usd
CY2021Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	615000	usd
CY2021Q2	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
CY2021Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	usd
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	5	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2019000	usd
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2019000	usd
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	usd
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	10	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2368000	usd
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2368000	usd
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	usd
CY2022Q2	gbci	Tdr With Pre Modification Loan Balance For Which Oreo Was Received TDRWithPreModificationLoanBalanceForWhichOreoWasReceived	489000	usd
CY2021Q2	gbci	Tdr With Pre Modification Loan Balance For Which Oreo Was Received TDRWithPreModificationLoanBalanceForWhichOreoWasReceived	1600000	usd
CY2022Q2	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	545000	usd
CY2021Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	102000	usd
CY2022Q2	gbci	Real Estate Acquired Through Foreclosure Securedby Residential Real Estate RealEstateAcquiredThroughForeclosureSecuredbyResidentialRealEstate	0	usd
CY2021Q4	gbci	Real Estate Acquired Through Foreclosure Securedby Residential Real Estate RealEstateAcquiredThroughForeclosureSecuredbyResidentialRealEstate	0	usd
CY2022Q2	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	17041000	usd
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	5995000	usd
CY2022Q2	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	906000	usd
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	516000	usd
CY2022Q2	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	16135000	usd
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	46097000	usd
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	5479000	usd
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	44699000	usd
CY2022Q2	us-gaap	Finance Lease Liability FinanceLeaseLiability	16545000	usd
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	49163000	usd
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	5781000	usd
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	47901000	usd
CY2022Q2	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P13Y
CY2022Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P18Y
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P23Y
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y
CY2022Q2	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.030
CY2022Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.035
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.026
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.034
CY2022Q2	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	2440000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	4875000	usd
CY2022Q2	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	2131000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	4475000	usd
CY2022Q2	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	2141000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	4217000	usd
CY2022Q2	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	2149000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	4128000	usd
CY2022Q2	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	2159000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	4014000	usd
CY2022Q2	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	8978000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	47990000	usd
CY2022Q2	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	19998000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	69699000	usd
CY2022Q2	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1894000	usd
CY2022Q2	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1238000	usd
CY2022Q2	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	14651000	usd
CY2022Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	47925000	usd
CY2022Q2	us-gaap	Finance Lease Liability FinanceLeaseLiability	16545000	usd
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	49163000	usd
CY2022Q2	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	3453000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	20536000	usd
CY2022Q2	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	312000	usd
CY2021Q2	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	62000	usd
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	390000	usd
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	123000	usd
CY2022Q2	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	88000	usd
CY2021Q2	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	38000	usd
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	134000	usd
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	75000	usd
CY2022Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	1494000	usd
CY2021Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	1302000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	2990000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	2581000	usd
CY2022Q2	us-gaap	Short Term Lease Cost ShortTermLeaseCost	108000	usd
CY2021Q2	us-gaap	Short Term Lease Cost ShortTermLeaseCost	82000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	213000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	168000	usd
CY2022Q2	us-gaap	Variable Lease Cost VariableLeaseCost	337000	usd
CY2021Q2	us-gaap	Variable Lease Cost VariableLeaseCost	234000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	644000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	495000	usd
CY2022Q2	us-gaap	Sublease Income SubleaseIncome	12000	usd
CY2021Q2	us-gaap	Sublease Income SubleaseIncome	10000	usd
	us-gaap	Sublease Income SubleaseIncome	24000	usd
	us-gaap	Sublease Income SubleaseIncome	21000	usd
CY2022Q2	us-gaap	Lease Cost LeaseCost	2327000	usd
CY2021Q2	us-gaap	Lease Cost LeaseCost	1708000	usd
	us-gaap	Lease Cost LeaseCost	4347000	usd
	us-gaap	Lease Cost LeaseCost	3421000	usd
CY2022Q2	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	112000	usd
CY2022Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	994000	usd
CY2021Q2	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	38000	usd
CY2021Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	786000	usd
CY2022Q2	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	243000	usd
CY2021Q2	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	27000	usd
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	158000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	2019000	usd
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	75000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	1566000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	282000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	54000	usd
CY2022Q1	us-gaap	Goodwill Goodwill	985393000	usd
CY2021Q1	us-gaap	Goodwill Goodwill	514013000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	985393000	usd
CY2020Q4	us-gaap	Goodwill Goodwill	514013000	usd
CY2022Q2	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2021Q2	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2022Q2	us-gaap	Goodwill Goodwill	985393000	usd
CY2021Q2	us-gaap	Goodwill Goodwill	514013000	usd
CY2022Q2	us-gaap	Goodwill Goodwill	985393000	usd
CY2021Q2	us-gaap	Goodwill Goodwill	514013000	usd
CY2021Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	40159000	usd
CY2022Q2	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	40159000	usd
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	12839000	usd
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	8976000	usd
	gbci	Servicing Asset At Amortized Cost Acquisitions ServicingAssetAtAmortizedCostAcquisitions	0	usd
	gbci	Servicing Asset At Amortized Cost Acquisitions ServicingAssetAtAmortizedCostAcquisitions	1354000	usd
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	1574000	usd
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	4435000	usd
	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	994000	usd
	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	1926000	usd
CY2022Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	13419000	usd
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	12839000	usd
CY2022Q2	us-gaap	Servicing Asset ServicingAsset	1659342000	usd
CY2021Q4	us-gaap	Servicing Asset ServicingAsset	1639058000	usd
CY2022Q2	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	19802000	usd
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	16938000	usd
CY2021Q2	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	3182000	usd
	us-gaap	Affordable Housing Project Investment Write Down Amount AffordableHousingProjectInvestmentWriteDownAmount	0	usd
	us-gaap	Affordable Housing Project Investment Write Down Amount AffordableHousingProjectInvestmentWriteDownAmount	0	usd
CY2022Q2	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2995000	usd
CY2021Q2	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2400000	usd
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	5990000	usd
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	4726000	usd
CY2022Q2	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	3981000	usd
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	7977000	usd
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	6277000	usd
CY2022Q2	gbci	Consulting Fees ConsultingFees	5266000	usd
CY2021Q2	gbci	Consulting Fees ConsultingFees	2744000	usd
	gbci	Consulting Fees ConsultingFees	8409000	usd
	gbci	Consulting Fees ConsultingFees	4915000	usd
CY2022Q2	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	2055000	usd
CY2021Q2	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	1078000	usd
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	8262000	usd
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	1182000	usd
CY2022Q2	gbci	Debit Card Expense DebitCardExpense	2280000	usd
CY2021Q2	gbci	Debit Card Expense DebitCardExpense	970000	usd
	gbci	Debit Card Expense DebitCardExpense	4084000	usd
	gbci	Debit Card Expense DebitCardExpense	2292000	usd
CY2022Q2	gbci	Loan Related Expenses LoanRelatedExpenses	1947000	usd
CY2021Q2	gbci	Loan Related Expenses LoanRelatedExpenses	1755000	usd
	gbci	Loan Related Expenses LoanRelatedExpenses	3770000	usd
	gbci	Loan Related Expenses LoanRelatedExpenses	3379000	usd
CY2022Q2	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	1169000	usd
CY2021Q2	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	1143000	usd
	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	3713000	usd
	gbci	Vie Write Downs Losses And Other Expenses VIEWriteDownsLossesAndOtherExpenses	2674000	usd
CY2022Q2	gbci	Telephone Expenses TelephoneExpenses	1691000	usd
CY2021Q2	gbci	Telephone Expenses TelephoneExpenses	1339000	usd
	gbci	Telephone Expenses TelephoneExpenses	3285000	usd
	gbci	Telephone Expenses TelephoneExpenses	2714000	usd
CY2022Q2	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	1433000	usd
CY2021Q2	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	753000	usd
	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	2521000	usd
	gbci	Miscellaneous Employee Expenses MiscellaneousEmployeeExpenses	1184000	usd
CY2022Q2	us-gaap	Business Development BusinessDevelopment	1216000	usd
CY2021Q2	us-gaap	Business Development BusinessDevelopment	1048000	usd
	us-gaap	Business Development BusinessDevelopment	2297000	usd
	us-gaap	Business Development BusinessDevelopment	1870000	usd
CY2022Q2	us-gaap	Postage Expense PostageExpense	1106000	usd
CY2021Q2	us-gaap	Postage Expense PostageExpense	874000	usd
	us-gaap	Postage Expense PostageExpense	2101000	usd
	us-gaap	Postage Expense PostageExpense	1835000	usd
CY2022Q2	us-gaap	Supplies Expense SuppliesExpense	977000	usd
CY2021Q2	us-gaap	Supplies Expense SuppliesExpense	823000	usd
	us-gaap	Supplies Expense SuppliesExpense	2027000	usd
	us-gaap	Supplies Expense SuppliesExpense	1613000	usd
CY2022Q2	us-gaap	Legal Fees LegalFees	843000	usd
CY2021Q2	us-gaap	Legal Fees LegalFees	636000	usd
	us-gaap	Legal Fees LegalFees	1291000	usd
	us-gaap	Legal Fees LegalFees	792000	usd
CY2022Q2	gbci	Deposit Related Expenses DepositRelatedExpenses	834000	usd
CY2021Q2	gbci	Deposit Related Expenses DepositRelatedExpenses	598000	usd
	gbci	Deposit Related Expenses DepositRelatedExpenses	1186000	usd
	gbci	Deposit Related Expenses DepositRelatedExpenses	754000	usd
CY2022Q2	gbci	Accounting Fees AccountingFees	227000	usd
CY2021Q2	gbci	Accounting Fees AccountingFees	238000	usd
	gbci	Accounting Fees AccountingFees	898000	usd
	gbci	Accounting Fees AccountingFees	693000	usd
CY2022Q2	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	957000	usd
CY2021Q2	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1045000	usd
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1267000	usd
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1398000	usd
CY2022Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1790000	usd
CY2021Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1006000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3144000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2107000	usd
CY2022Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	21877000	usd
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13960000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	45721000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	26606000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-51728000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-52648000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-354300000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-354571000	usd
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	76392000	usd
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	76392000	usd
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	77627000	usd
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	77627000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	144187000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	144187000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	158429000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	158429000	usd
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110765379	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	95505877	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110745017	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	95485839	shares
CY2022Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	29603	shares
CY2021Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	75027	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	54351	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	79752	shares
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110794982	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	95580904	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110799368	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	95565591	shares
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.66
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.30
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2022Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	139496	shares
CY2021Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	105947	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares

Files In Submission

Name	View Source	Status
0000868671-22-000077-index-headers.html	Edgar Link	pending
0000868671-22-000077-index.html	Edgar Link	pending
0000868671-22-000077.txt	Edgar Link	pending
0000868671-22-000077-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
gbci-06302022xex311.htm	Edgar Link	pending
gbci-06302022xex312.htm	Edgar Link	pending
gbci-06302022xex32.htm	Edgar Link	pending
gbci-20220630.htm	Edgar Link	pending
gbci-20220630.xsd	Edgar Link	pending
gbci-20220630_cal.xml	Edgar Link	unprocessable
gbci-20220630_def.xml	Edgar Link	unprocessable
gbci-20220630_htm.xml	Edgar Link	completed
gbci-20220630_lab.xml	Edgar Link	unprocessable
gbci-20220630_pre.xml	Edgar Link	unprocessable
gbciamendedarticlesapril.htm	Edgar Link	pending
gbciamendedarticlesapril001.jpg	Edgar Link	pending
gbciamendedarticlesapril002.jpg	Edgar Link	pending
gbciamendedarticlesapril003.jpg	Edgar Link	pending
gbciamendedarticlesapril004.jpg	Edgar Link	pending
gbciamendedarticlesapril005.jpg	Edgar Link	pending
gbciamendedarticlesapril006.jpg	Edgar Link	pending
gbciamendedarticlesapril007.jpg	Edgar Link	pending
gbciexhibit4.htm	Edgar Link	pending
gbciexhibit4001.jpg	Edgar Link	pending
gbciexhibit4002.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$GBCI
GLACIER BANCORP, INC. Stock $gbci

2022 Q3 Form 10-Q Financial Statement

#000086867122000077 Filed on August 02, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GBCI GLACIER BANCORP, INC. Stock $gbci

2022 Q3 Form 10-Q Financial Statement

#000086867122000077 Filed on August 02, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GBCI
GLACIER BANCORP, INC. Stock $gbci