$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb

$colb Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000088734324000089 Filed on February 27, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023 Q3
Revenue	$684.2M		$696.0M
YoY Change	43.76%		314.92%
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	$39.96M	$41.85M	$39.30M
YoY Change	109.85%	220.78%	193.9%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$260.9M		$215.1M
YoY Change	157.63%		3993.19%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$169.1M	$127.1M	$184.0M
YoY Change	-993.4%	45.86%	123.24%
Income Tax	$44.99M	$33.54M	$48.13M
% Of Pretax Income	26.61%	26.39%	26.16%
Net Earnings	$124.1M	$93.53M	$135.8M
YoY Change	-983.89%	35.74%	109.18%
Net Earnings / Revenue	18.13%		19.52%
Basic Earnings Per Share	$0.60		$0.65
Diluted Earnings Per Share	$0.59	$0.45	$0.65
COMMON SHARES
Basic Shares Outstanding	208.6M shares	208.6M shares	208.6M shares
Diluted Shares Outstanding	209.0M shares		208.6M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$2.201B	$2.163B	$2.404B
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	$450.7M	$454.8M	$337.9M
YoY Change	20.13%	183.22%	108.74%
Goodwill	$1.000B	$1.000B	$1.000B
YoY Change	-2.93%	21.48%	21.48%
Intangibles	$571.6M	$603.7M	$636.9M
YoY Change	-18.61%	2226.41%	2181.02%
Long-Term Investments
YoY Change
Other Assets	$356.0M	$347.2M	$470.0M
YoY Change	1.37%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$52.22B	$52.17B	$51.99B
YoY Change	-3.28%	157.45%	154.8%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$129.2M	$130.6M	$130.0M
YoY Change	-8.11%
Deferred Revenue
YoY Change
Short-Term Debt	$213.6M	$252.1M	$35.00M
YoY Change	327.15%	164.92%	-28.18%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$342.8M	$382.7M	$388.0M
YoY Change	-16.73%	302.13%	696.18%
LONG-TERM LIABILITIES
Long-Term Debt	$417.4M	$4.374B	$4.424B
YoY Change	-93.43%	21437.84%	21682.37%
Other Long-Term Liabilities	$900.4M	$814.5M	$925.0M
YoY Change	19.15%	200.06%	248.8%
Total Long-Term Liabilities	$1.318B	$5.189B	$5.349B
YoY Change	-81.47%	1678.48%	1773.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$342.8M	$382.7M	$388.0M
Total Long-Term Liabilities	$1.318B	$5.189B	$5.349B
Total Liabilities	$47.27B	$47.18B	$47.36B
YoY Change	-3.75%	161.34%	158.95%
SHAREHOLDERS EQUITY
Retained Earnings	-$418.9M	-$467.6M	-$485.6M
YoY Change	-30.6%	-155.01%	-160.34%
Common Stock	$5.802B	$5.803B	$5.798B
YoY Change	0.24%	198.42%	198.82%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.957B	$4.995B	$4.632B
YoY Change
Total Liabilities & Shareholders Equity	$52.22B	$52.17B	$51.99B
YoY Change	-3.28%	157.45%	154.8%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023 Q3
OPERATING ACTIVITIES
Net Income	$124.1M	$93.53M	$135.8M
YoY Change	-983.89%	35.74%	109.18%
Depreciation, Depletion And Amortization	$39.96M	$41.85M	$39.30M
YoY Change	109.85%	220.78%	193.9%
Cash From Operating Activities	$185.5M	$92.34M	$350.1M
YoY Change	-576.06%	19.97%	463.28%
INVESTING ACTIVITIES
Capital Expenditures	$5.899M
YoY Change	69.22%
Acquisitions
YoY Change
Other Investing Activities	-$381.0K	-$200.1M	$228.5M
YoY Change	414.86%	-220.91%	-319.01%
Cash From Investing Activities	-$77.68M	-$200.1M	$232.0M
YoY Change	-116.84%	-222.13%	-318.35%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$69.25M	-133.5M	-1.586B
YoY Change	-103.61%	-49.95%	2924.45%
NET CHANGE
Cash From Operating Activities	$185.5M	92.34M	350.1M
Cash From Investing Activities	-$77.68M	-200.1M	232.0M
Cash From Financing Activities	-$69.25M	-133.5M	-1.586B
Net Change In Cash	$38.58M	-241.2M	-1.004B
YoY Change	-98.35%	830.09%	939.67%
FREE CASH FLOW
Cash From Operating Activities	$185.5M	$92.34M	$350.1M
Capital Expenditures	$5.899M
Free Cash Flow	$179.6M
YoY Change	-523.08%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	111659000	usd
CY2023	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2539327000	usd
CY2022	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1148017000	usd
CY2023	us-gaap	Interest Expense Deposits InterestExpenseDeposits	461654000	usd
CY2022	us-gaap	Interest Expense Deposits InterestExpenseDeposits	48195000	usd
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	27151000	usd
CY2022	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	997000	usd
CY2021	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	280000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000887343
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2022	us-gaap	Servicing Asset At Fair Value Other Change In Fair Value Statement Of Income Or Comprehensive Income Extensible Enumeration ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#ServicingAssetAtFairValueAmount
CY2021	us-gaap	Servicing Asset At Fair Value Other Change In Fair Value Statement Of Income Or Comprehensive Income Extensible Enumeration ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#ServicingAssetAtFairValueAmount
CY2023	us-gaap	Servicing Asset At Fair Value Other Change In Fair Value Statement Of Income Or Comprehensive Income Extensible Enumeration ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#ServicingAssetAtFairValueAmount
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	000-20288
CY2023	dei	Entity Registrant Name EntityRegistrantName	COLUMBIA BANKING SYSTEM, INC.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	WA
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	91-1422237
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	1301 A Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Tacoma
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98402-2156
CY2023	dei	City Area Code CityAreaCode	253
CY2023	dei	Local Phone Number LocalPhoneNumber	305-1900
CY2023	dei	Security12b Title Security12bTitle	Common Stock
CY2023	dei	Trading Symbol TradingSymbol	COLB
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	3376871634	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	208625649	shares
CY2023	dei	Auditor Firm AuditorFirmId	34
CY2023	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2023	dei	Auditor Location AuditorLocation	Portland, Oregon
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	498496000	usd
CY2022Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	327313000	usd
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	1664038000	usd
CY2022Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	967330000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2162534000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1294643000	usd
CY2023Q4	colb	Equityand Other Investment Securities EquityandOtherInvestmentSecurities	76995000	usd
CY2022Q4	colb	Equityand Other Investment Securities EquityandOtherInvestmentSecurities	72959000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8829870000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3196166000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2300000	usd
CY2022Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2476000	usd
CY2023Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	30715000	usd
CY2022Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	71647000	usd
CY2023Q4	colb	Fair Value Portfolio Loans FairValuePortfolioLoans	275140000	usd
CY2022Q4	colb	Fair Value Portfolio Loans FairValuePortfolioLoans	285581000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	37441951000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	26155981000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	440871000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	301135000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	37001080000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	25854846000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	179274000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	47144000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	338970000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	176016000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	115811000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	78598000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	1029234000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	0	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	603679000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4745000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	109243000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	185017000	usd
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	680948000	usd
CY2022Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	331759000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	347203000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	132823000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	665740000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	399800000	usd
CY2023Q4	us-gaap	Assets Assets	52173596000	usd
CY2022Q4	us-gaap	Assets Assets	31848639000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	14256452000	usd
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	10288849000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	27350568000	usd
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	16776763000	usd
CY2023Q4	us-gaap	Deposits Deposits	41607020000	usd
CY2022Q4	us-gaap	Deposits Deposits	27065612000	usd
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	252119000	usd
CY2022Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	308769000	usd
CY2023Q4	us-gaap	Other Borrowings OtherBorrowings	3950000000	usd
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	906175000	usd
CY2023Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	316440000	usd
CY2022Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	323639000	usd
CY2023Q4	colb	Junior And Other Subordinated Debentures At Amortized Cost JuniorAndOtherSubordinatedDebenturesAtAmortizedCost	107895000	usd
CY2022Q4	colb	Junior And Other Subordinated Debentures At Amortized Cost JuniorAndOtherSubordinatedDebenturesAtAmortizedCost	87813000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	130576000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	91694000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	814512000	usd
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	585111000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	47178562000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	29368813000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2023Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	520000000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	208584667	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	208584667	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	5802747000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-467571000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-340142000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	4995034000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	52173596000	usd
CY2023	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	3923000	usd
CY2023	us-gaap	Interest Expense Debt InterestExpenseDebt	242914000	usd
CY2022	us-gaap	Interest Expense Debt InterestExpenseDebt	8920000	usd
CY2021	us-gaap	Interest Expense Debt InterestExpenseDebt	2838000	usd
CY2023	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	37665000	usd
CY2022	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	19889000	usd
CY2021	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	12127000	usd
CY2023	us-gaap	Interest Expense InterestExpense	746156000	usd
CY2022	us-gaap	Interest Expense InterestExpense	78001000	usd
CY2021	us-gaap	Interest Expense InterestExpense	42396000	usd
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1793171000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1070016000	usd
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	919647000	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	213199000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	84016000	usd
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-42651000	usd
CY2023	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1579972000	usd
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	986000000	usd
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	962298000	usd
CY2023	colb	Residential Mortgage Banking Revenue Loss Net ResidentialMortgageBankingRevenueLossNet	16789000	usd
CY2022	colb	Residential Mortgage Banking Revenue Loss Net ResidentialMortgageBankingRevenueLossNet	106859000	usd
CY2021	colb	Residential Mortgage Banking Revenue Loss Net ResidentialMortgageBankingRevenueLossNet	186811000	usd
CY2023	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	13000	usd
CY2022	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	2000	usd
CY2021	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	8000	usd
CY2023	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2300000	usd
CY2022	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-7099000	usd
CY2021	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1511000	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4414000	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6696000	usd
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	15715000	usd
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	15624000	usd
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	8253000	usd
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	8302000	usd
CY2023	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	30528000	usd
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	-1008000	usd
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	63681000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	203927000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	199528000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	356318000	usd
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	616103000	usd
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	441226000	usd
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	480820000	usd
CY2023	us-gaap	Occupancy Net OccupancyNet	183480000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	138451000	usd
CY2021	us-gaap	Occupancy Net OccupancyNet	137546000	usd
CY2023	us-gaap	Communication Communication	16252000	usd
CY2022	us-gaap	Communication Communication	10429000	usd
CY2021	us-gaap	Communication Communication	11564000	usd
CY2023	us-gaap	Marketing Expense MarketingExpense	11399000	usd
CY2022	us-gaap	Marketing Expense MarketingExpense	6540000	usd
CY2021	us-gaap	Marketing Expense MarketingExpense	7381000	usd
CY2023	us-gaap	Professional Fees ProfessionalFees	57641000	usd
CY2022	us-gaap	Professional Fees ProfessionalFees	51323000	usd
CY2021	us-gaap	Professional Fees ProfessionalFees	48800000	usd
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	71402000	usd
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	13964000	usd
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	9238000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	111296000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4095000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4520000	usd
CY2023	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	171659000	usd
CY2022	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	17356000	usd
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	15183000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	73468000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	51566000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	45404000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	1312700000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	734950000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	760456000	usd
CY2023	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	471199000	usd
CY2022	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	450578000	usd
CY2021	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	558160000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	122484000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	113826000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	137860000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	348715000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	420300000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.79
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.22
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.78
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.60
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.21
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	195304000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	129277000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	130499000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	195871000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129732000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	131030000	shares
CY2023	us-gaap	Net Income Loss NetIncomeLoss	348715000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	336752000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	420300000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	109221000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-548193000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-124970000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	28411000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-140995000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-32142000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	13000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	2000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	8000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	3000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	2000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	80800000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-407199000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-92834000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	7866000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-28842000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-37899000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	2045000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	-7418000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	-9747000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	5821000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-21424000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-28152000	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-136000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-35000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-101000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	86722000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-428623000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-120986000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	435437000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-91871000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	299314000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2704577000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	420300000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-120986000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10906000	usd
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	80690000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	34000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.40
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	184871000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2749270000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	336752000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-428623000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9753000	usd
CY2022	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4163000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	54000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.40
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	183217000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2479826000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	348715000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18073000	usd
CY2023	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	6282000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	usd
CY2023	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1185000	usd
CY2023	us-gaap	Stock Issued During Period Shares Acquisitions StockIssuedDuringPeriodSharesAcquisitions	78863112	shares
CY2023	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	2339278000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.43
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	272483000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4995034000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	348715000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	336752000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	420300000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12895000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14383000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	40805000	usd
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	67702000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-6601000	usd
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-14404000	usd
CY2023	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	13000	usd
CY2022	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	2000	usd
CY2021	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	8000	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	213199000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	84016000	usd
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-42651000	usd
CY2023	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	15962000	usd
CY2022	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	8353000	usd
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	8402000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	144252000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	28305000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	31498000	usd
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	31472000	usd
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2747000	usd
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	574000	usd
CY2023	colb	Increase In Mortgage Servicing Rights Carried At Fair Value IncreaseInMortgageServicingRightsCarriedAtFairValue	5347000	usd
CY2022	colb	Increase In Mortgage Servicing Rights Carried At Fair Value IncreaseInMortgageServicingRightsCarriedAtFairValue	24137000	usd
CY2021	colb	Increase In Mortgage Servicing Rights Carried At Fair Value IncreaseInMortgageServicingRightsCarriedAtFairValue	38522000	usd
CY2023	colb	Change In Mortgage Servicing Rights Carried At Fair Value ChangeInMortgageServicingRightsCarriedAtFairValue	-23816000	usd
CY2022	colb	Change In Mortgage Servicing Rights Carried At Fair Value ChangeInMortgageServicingRightsCarriedAtFairValue	37265000	usd
CY2021	colb	Change In Mortgage Servicing Rights Carried At Fair Value ChangeInMortgageServicingRightsCarriedAtFairValue	-7814000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	18073000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	9753000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	10906000	usd
CY2023	colb	Increase Decreasein Equity Securities IncreaseDecreaseinEquitySecurities	448000	usd
CY2022	colb	Increase Decreasein Equity Securities IncreaseDecreaseinEquitySecurities	-1156000	usd
CY2021	colb	Increase Decreasein Equity Securities IncreaseDecreaseinEquitySecurities	-352000	usd
CY2023	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2300000	usd
CY2022	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-7099000	usd
CY2021	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1511000	usd
CY2023	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	10200000	usd
CY2022	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	-1953000	usd
CY2021	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	145723000	usd
CY2023	us-gaap	Increase Decrease In Mortgage Loans Held For Sale IncreaseDecreaseInMortgageLoansHeldForSale	-341000	usd
CY2022	us-gaap	Increase Decrease In Mortgage Loans Held For Sale IncreaseDecreaseInMortgageLoansHeldForSale	-10670000	usd
CY2021	us-gaap	Increase Decrease In Mortgage Loans Held For Sale IncreaseDecreaseInMortgageLoansHeldForSale	-21427000	usd
CY2023	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	441568000	usd
CY2022	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	1839466000	usd
CY2021	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	4747104000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	602634000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	2076548000	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	4952918000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	24163000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-169540000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-153148000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-94910000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	230223000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-9376000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	669840000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1065029000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	662723000	usd
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	926216000	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	276812000	usd
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1838923000	usd
CY2023	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	1694850000	usd
CY2022	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	396100000	usd
CY2021	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	761249000	usd
CY2023	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	290817000	usd
CY2022	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	180543000	usd
CY2021	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	53000	usd
CY2023	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	260697000	usd
CY2022	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	144315000	usd
CY2021	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	30803000	usd
CY2023	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1335189000	usd
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	3744493000	usd
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	735422000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	748264000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	148978000	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	246667000	usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	40688000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	27086000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15478000	usd
CY2023	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	28243000	usd
CY2022	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	usd
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	usd
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4799000	usd
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4339000	usd
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4127000	usd
CY2023	us-gaap	Payments For Proceeds From Mortgage Servicing Rights PaymentsForProceedsFromMortgageServicingRights	-57305000	usd
CY2022	us-gaap	Payments For Proceeds From Mortgage Servicing Rights PaymentsForProceedsFromMortgageServicingRights	0	usd
CY2021	us-gaap	Payments For Proceeds From Mortgage Servicing Rights PaymentsForProceedsFromMortgageServicingRights	0	usd
CY2023	colb	Net Cash Received In Ui Divestiture NetCashReceivedInUIDivestiture	0	usd
CY2022	colb	Net Cash Received In Ui Divestiture NetCashReceivedInUIDivestiture	0	usd
CY2021	colb	Net Cash Received In Ui Divestiture NetCashReceivedInUIDivestiture	-10781000	usd
CY2023	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	-274587000	usd
CY2022	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	0	usd
CY2021	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	0	usd
CY2023	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1011000	usd
CY2022	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2110000	usd
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1974000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	501736000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3533092000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1534275000	usd
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-651130000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	470945000	usd
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1972519000	usd
CY2023	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-126675000	usd
CY2022	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-183478000	usd
CY2021	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	116863000	usd
CY2023	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	14000000	usd
CY2022	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	0	usd
CY2021	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	0	usd
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	17350000000	usd
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1650000000	usd
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	usd
CY2023	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	16586522000	usd
CY2022	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	750000000	usd
CY2021	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	765000000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1185000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	54000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	34000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	270261000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	182273000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	183734000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6282000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4163000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	80690000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-303685000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1001085000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1059992000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	867891000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1466978000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	188440000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1294643000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2761621000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2573181000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2162534000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1294643000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2761621000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	692991000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	71209000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	42820000	usd
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	138910000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	71804000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	105119000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	80800000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-407199000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-92834000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	5821000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-21424000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-28152000	usd
CY2023	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	118085000	usd
CY2022	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	usd
CY2021	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	usd
CY2023	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	5754000	usd
CY2022	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	25057000	usd
CY2021	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	315887000	usd
CY2023	us-gaap	Nature Of Operations NatureOfOperations	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Nature of Operations</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">-</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Columbia Banking System, Inc. is headquartered in Tacoma, Washington, and is engaged primarily in the business of commercial and consumer banking. The Company provides a broad range of banking and other financial services to corporate, institutional, small business, and individual customers through its wholly-owned banking subsidiary Umpqua Bank. The Bank has a wholly-owned subsidiary, Financial Pacific Leasing, Inc., which is a commercial equipment leasing company.</span></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company and its subsidiaries are subject to regulation by certain federal and state agencies and undergo periodic examination by these regulatory agencies.</span></div>
CY2023	colb	Cash And Cash Equivalents General Maturity CashAndCashEquivalentsGeneralMaturity	P90D
CY2023	us-gaap	Revenue Recognition Interest RevenueRecognitionInterest	<div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Revenue Recognition</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">-</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company's revenue within the contracts with customers guidance are presented within non-interest income and include service charges on deposits, card-based fees, merchant fee income, and financial services, brokerage revenue and trust revenue. These revenues are recognized when obligations under the terms of a contract with customers are satisfied. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods or providing services. When the amount of consideration is variable, the Company will only recognize revenue to the extent that it is probable that the cumulative amount recognized will not be subject to a significant reversal in the future. Substantially all of the Company's contracts with customers have expected durations of one year or less and payments are typically due when or as the services are rendered or shortly thereafter. When third parties are involved in providing services to customers, the Company recognizes revenue on a gross basis when it has control over those services being provided to the customer; otherwise, revenue is recognized for the net amount of any fee or commission.</span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Revenue is segregated based on the nature of product and services offered as part of contractual arrangements. Revenue from contracts with customers is broadly segregated as follows:</span></div><div style="padding-left:72pt;text-indent:-13.5pt"><span><br/></span></div><div style="padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%;padding-left:14.5pt">Service charges on deposits</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> consist primarily of fees earned from deposit customers for account maintenance and transaction-based and overdraft services. Account maintenance fees consist primarily of account fees and analyzed account fees charged on deposit accounts on a monthly basis. The performance obligation is satisfied, and the fees are recognized on a monthly basis as the service period is completed. Transaction-based fees on deposit accounts are charged to deposit customers for specific services provided to the customer, such as non-sufficient funds fees, overdraft fees, and wire fees. The performance obligation is completed as the transaction occurs and the fees are recognized at the time each specific service is provided to the customer. </span></div><div style="padding-left:36pt;text-indent:-18pt"><span><br/></span></div><div style="padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%;padding-left:14.5pt">Card-based fees</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> are comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned when the Bank's customers' debit and credit cards are processed through card payment networks. The performance obligation is satisfied, and the fees are earned when the cost of the transaction is charged to the cardholders' debit or credit card. Certain expenses and rebates directly related to the credit and debit card interchange contract are recorded on a net basis with the interchange income. </span></div><div style="padding-left:36pt;text-indent:-18pt"><span><br/></span></div><div style="padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%;padding-left:14.5pt">Financial services and trust revenue</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> consists of brokerage revenue related to third-party revenue share agreements for commissions on brokerage services and trust revenue from trust administration and investment management services. Brokerage revenue is recognized when cash payment is received by the third party based on the net revenues earned on the products and services purchased in the month prior. Trust revenue is recognized monthly and based on the portfolio values at the end of the prior month. </span></div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%;padding-left:14.5pt">Other non-interest income </span>includes a variety of other revenue streams including residential mortgage banking, net revenue, security gains and losses, loan sales gain and losses, BOLI income revenue, swap revenue, treasury management, and miscellaneous consumer fees. These revenue streams are not in the scope of revenue from contracts with customers guidance. Revenue is recognized when, or as, the performance obligation is satisfied. Inherent variability in the transaction price is not recognized until the uncertainty affecting the variability is resolved.
CY2023	us-gaap	Derivatives Methods Of Accounting Nonhedging Derivatives DerivativesMethodsOfAccountingNonhedgingDerivatives	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Derivatives</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">-</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Bank enters into forward delivery contracts to sell residential mortgage loans or mortgage-backed securities to broker/dealers at specific prices and dates in order to hedge the interest rate risk in its portfolio of mortgage loans held for sale and its residential mortgage loan commitments. The commitments to originate mortgage loans held for sale and the related forward delivery contracts are considered derivatives. The Bank also executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are hedged by simultaneously entering into an offsetting interest rate swap that the Bank executes with a third party, such that the Bank minimizes its net risk exposure. The Bank also uses certain derivative financial instruments to offset changes in the value of its MSR. These derivatives consist primarily of interest rate futures and forward settling mortgage-backed securities. The Company considers all free-standing derivatives as economic hedges and recognizes these derivatives as either assets or liabilities in the balance sheet, and the Company requires measurement of those instruments at fair value through adjustments to current earnings. None of the Company's derivatives are designated as hedging instruments.</span></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The fair value of the derivative residential mortgage loan commitments is estimated using the net present value of expected future cash flows. Assumptions used include pull-through rate assumption based on historical information, current mortgage interest rates, the stage of completion of the underlying application and underwriting process, direct origination costs yet to be incurred, the time remaining until the expiration of the derivative loan commitment, and the expected net future cash flows related to the associated servicing of the loan.</span></div>The Bank may use derivatives to hedge the risk of changes in the fair values of interest rate lock commitments, residential mortgage loans held for sale, and MSRs. None of the Company's derivatives are designated as hedging instruments. Rather, they are accounted for as free-standing derivatives, or economic hedges, with changes in the fair value of the derivatives reported in income. The Company utilizes forward interest rate contracts in its derivative risk management strategy.
CY2023Q4	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P10Y
CY2023	colb	Business Combination Acquisition Related Costs Communication BusinessCombinationAcquisitionRelatedCostsCommunication	20000000	usd
CY2022	colb	Business Combination Acquisition Related Costs Communication BusinessCombinationAcquisitionRelatedCostsCommunication	0	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9262777000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	55201000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	488108000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8829870000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2300000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	725000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3025000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3738281000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	234000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	542349000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3196166000	usd
CY2022Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2476000	usd
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	721000	usd
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	usd
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3197000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1292794000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	12009000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2809244000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	476099000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4102038000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	488108000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1486583000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	143817000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1660143000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	398532000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3146726000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	542349000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	600	securities
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	473	securities
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	71438000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	70451000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	0	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	0	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2127299000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2106753000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	2000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	2388442000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2323581000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	3000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	67000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	4675598000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	4329085000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	2295000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	2956000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9262777000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8829870000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2300000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3025000	usd
CY2023Q4	colb	Pledged Assets Not Separately Reported Securities Pledged For State And Local Governments PledgedAssetsNotSeparatelyReportedSecuritiesPledgedForStateAndLocalGovernments	1796582000	usd
CY2023Q4	colb	Pledged Assets Separately Reported Securities Pledged For State And Local Governments At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedForStateAndLocalGovernmentsAtFairValue	1657160000	usd
CY2023Q4	colb	Pledged Assets Not Separately Reported Repurchase Agreement PledgedAssetsNotSeparatelyReportedRepurchaseAgreement	386989000	usd
CY2023Q4	colb	Pledged Assets Separately Reported Repurchase Agreement PledgedAssetsSeparatelyReportedRepurchaseAgreement	358162000	usd
CY2023Q4	colb	Financial Instruments Other At Amortized Cost FinancialInstrumentsOtherAtAmortizedCost	1863025000	usd
CY2023Q4	us-gaap	Financial Instruments Owned Other At Fair Value FinancialInstrumentsOwnedOtherAtFairValue	1766958000	usd
CY2023Q4	colb	Financial Instruments Owned At Amortized Cost FinancialInstrumentsOwnedAtAmortizedCost	4046596000	usd
CY2023Q4	us-gaap	Financial Instruments Owned At Fair Value FinancialInstrumentsOwnedAtFairValue	3782280000	usd
CY2023Q4	colb	Loans Receivable Commercial Re Nonowneroccupiedtermnet LoansReceivableCommercialRENonowneroccupiedtermnet	6482940000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Nonowneroccupiedtermnet LoansReceivableCommercialRENonowneroccupiedtermnet	3894840000	usd
CY2023Q4	colb	Loans Receivable Commercial Re Owner Occupied Term Net LoansReceivableCommercialREOwnerOccupiedTermNet	5195605000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Owner Occupied Term Net LoansReceivableCommercialREOwnerOccupiedTermNet	2567761000	usd
CY2023Q4	colb	Loans Receivable Commercial Re Multifamily Net LoansReceivableCommercialREMultifamilyNet	5704734000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Multifamily Net LoansReceivableCommercialREMultifamilyNet	5285791000	usd
CY2023Q4	colb	Loans Receivable Commercial Re Construction Development Net LoansReceivableCommercialREConstructionDevelopmentNet	1747302000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Construction Development Net LoansReceivableCommercialREConstructionDevelopmentNet	1077346000	usd
CY2023Q4	colb	Loans Receivable Commercial Re Residential Development Net LoansReceivableCommercialREResidentialDevelopmentNet	323899000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Residential Development Net LoansReceivableCommercialREResidentialDevelopmentNet	200838000	usd
CY2023Q4	colb	Loans Receivable Commercial Term LoansReceivableCommercialTerm	5536765000	usd
CY2022Q4	colb	Loans Receivable Commercial Term LoansReceivableCommercialTerm	3029547000	usd
CY2023Q4	colb	Loans Receivable Commercial Loc And Other LoansReceivableCommercialLocAndOther	2430127000	usd
CY2022Q4	colb	Loans Receivable Commercial Loc And Other LoansReceivableCommercialLocAndOther	960054000	usd
CY2023Q4	colb	Loans Receivable Commercial Leases And Equipment Finance LoansReceivableCommercialLeasesAndEquipmentFinance	1729512000	usd
CY2022Q4	colb	Loans Receivable Commercial Leases And Equipment Finance LoansReceivableCommercialLeasesAndEquipmentFinance	1706172000	usd
CY2023Q4	colb	Loan Receivable Residential Mortgage Net LoanReceivableResidentialMortgageNet	6157166000	usd
CY2022Q4	colb	Loan Receivable Residential Mortgage Net LoanReceivableResidentialMortgageNet	5647035000	usd
CY2023Q4	colb	Loan Receivable Residential Hell Net LoanReceivableResidentialHELLNet	1938166000	usd
CY2022Q4	colb	Loan Receivable Residential Hell Net LoanReceivableResidentialHELLNet	1631965000	usd
CY2023Q4	colb	Loan Receivable Consumer Other Net LoanReceivableConsumerOtherNet	195735000	usd
CY2022Q4	colb	Loan Receivable Consumer Other Net LoanReceivableConsumerOtherNet	154632000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	37441951000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	26155981000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	71800000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	84700000	usd
CY2023Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	552500000	usd
CY2022Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	6100000	usd
CY2023	us-gaap	Direct Financing Lease Interest Income DirectFinancingLeaseInterestIncome	18800000	usd
CY2022	us-gaap	Direct Financing Lease Interest Income DirectFinancingLeaseInterestIncome	18800000	usd
CY2023Q4	us-gaap	Direct Financing Lease Lease Receivable DirectFinancingLeaseLeaseReceivable	362152000	usd
CY2022Q4	us-gaap	Direct Financing Lease Lease Receivable DirectFinancingLeaseLeaseReceivable	316823000	usd
CY2023Q4	colb	Net Investmentin Direct Financing Leases Guaranteedand Unguaranteed Residual Valuesof Leased Property NetInvestmentinDirectFinancingLeasesGuaranteedandUnguaranteedResidualValuesofLeasedProperty	74880000	usd
CY2022Q4	colb	Net Investmentin Direct Financing Leases Guaranteedand Unguaranteed Residual Valuesof Leased Property NetInvestmentinDirectFinancingLeasesGuaranteedandUnguaranteedResidualValuesofLeasedProperty	98175000	usd
CY2023Q4	colb	Direct Financing Lease Initial Direct Cost DirectFinancingLeaseInitialDirectCost	5373000	usd
CY2022Q4	colb	Direct Financing Lease Initial Direct Cost DirectFinancingLeaseInitialDirectCost	6033000	usd
CY2023Q4	us-gaap	Direct Financing Lease Deferred Selling Profit DirectFinancingLeaseDeferredSellingProfit	48433000	usd
CY2022Q4	us-gaap	Direct Financing Lease Deferred Selling Profit DirectFinancingLeaseDeferredSellingProfit	41571000	usd
CY2023Q4	us-gaap	Direct Financing Lease Net Investment In Lease DirectFinancingLeaseNetInvestmentInLease	393972000	usd
CY2022Q4	us-gaap	Direct Financing Lease Net Investment In Lease DirectFinancingLeaseNetInvestmentInLease	379460000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	112497000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	90557000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	68639000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	47308000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	27955000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	15196000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	362152000	usd
CY2023	us-gaap	Loans Receivable Held For Sale Reconciliation To Cash Flow Deductions From Held For Sale LoansReceivableHeldForSaleReconciliationToCashFlowDeductionsFromHeldForSale	743900000	usd
CY2023	colb	Carrying Value Of Loans Sold Non Relationship Jumbo CarryingValueOfLoansSoldNonRelationshipJumbo	666300000	usd
CY2022	us-gaap	Loans Receivable Held For Sale Reconciliation To Cash Flow Deductions From Held For Sale LoansReceivableHeldForSaleReconciliationToCashFlowDeductionsFromHeldForSale	142300000	usd
CY2023	colb	Length Of Time Projected By Model LengthOfTimeProjectedByModel	P10Y
CY2023Q4	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	464100000	usd
CY2022Q4	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	315400000	usd
CY2023	colb	Financing Receivable Purchased With Credit Deterioration Acl On Pcd And Unfunded Commitments At Acquisition Date FinancingReceivablePurchasedWithCreditDeteriorationACLOnPCDAndUnfundedCommitmentsAtAcquisitionDate	32300000	usd
CY2023Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	88400000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	301135000	usd
CY2023	us-gaap	Financing Receivable Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	26492000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	209979000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	116974000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	20239000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	96735000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	440871000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	14221000	usd
CY2023	colb	Off Balance Sheet Credit Loss Liability Acquired During The Period OffBalanceSheetCreditLossLiabilityAcquiredDuringThePeriod	5767000	usd
CY2023	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	3220000	usd
CY2023Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	23208000	usd
CY2023Q4	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	464079000	usd
CY2023Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	88400000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	248412000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	83605000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	44989000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	14107000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	30882000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	301135000	usd
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	12767000	usd
CY2022	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	1454000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	14221000	usd
CY2022Q4	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	315356000	usd
CY2023	colb	Days Past Due On Leases And Equipment Finance DaysPastDueOnLeasesAndEquipmentFinance	P181D
CY2022	colb	Interest Income On Non Accrual Loans And Leases InterestIncomeOnNonAccrualLoansAndLeases	0	usd
CY2023	colb	Interest Income On Non Accrual Loans And Leases InterestIncomeOnNonAccrualLoansAndLeases	0	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	74371000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	37441951000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	30702000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	26155981000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	4901000	usd
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	279000	usd
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	138114000	usd
CY2023	us-gaap	Financing Receivable Modification To Total Financing Receivables Percent FinancingReceivableModificationToTotalFinancingReceivablesPercent	0.0037
CY2023	colb	Financing Receivable Modified In Period Nonaccrual Amount FinancingReceivableModifiedInPeriodNonaccrualAmount	3462000	usd
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	138114000	usd
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	46	contracts
CY2022	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	6512000	usd
CY2023Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	3747171000	usd
CY2023Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	8958366000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	8055492000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	2712461000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	2838682000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	5504993000	usd
CY2023Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	5504255000	usd
CY2023Q4	colb	Financing Receivable Revolving To Non Revolving Loans Amortized Cost FinancingReceivableRevolvingToNonRevolvingLoansAmortizedCost	120531000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	37441951000	usd
CY2022Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	6826217000	usd
CY2022Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	6855556000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	2022796000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	2421887000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1250979000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3127311000	usd
CY2022Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	3522507000	usd
CY2022Q4	colb	Financing Receivable Revolving To Non Revolving Loans Amortized Cost FinancingReceivableRevolvingToNonRevolvingLoansAmortizedCost	128728000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	26155981000	usd
CY2023Q4	us-gaap	Land Land	91072000	usd
CY2022Q4	us-gaap	Land Land	33031000	usd
CY2023Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	288189000	usd
CY2022Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	203519000	usd
CY2023Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	140241000	usd
CY2022Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	142209000	usd
CY2023Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	110726000	usd
CY2022Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	105355000	usd
CY2023Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	24094000	usd
CY2022Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	16878000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	654322000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	500992000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	315352000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	324976000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	338970000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	176016000	usd
CY2023	colb	Depreciation And Amortization On Property Plant And Equipment DepreciationAndAmortizationOnPropertyPlantAndEquipment	29300000	usd
CY2022	colb	Depreciation And Amortization On Property Plant And Equipment DepreciationAndAmortizationOnPropertyPlantAndEquipment	22900000	usd
CY2021	colb	Depreciation And Amortization On Property Plant And Equipment DepreciationAndAmortizationOnPropertyPlantAndEquipment	25700000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	115811000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	78598000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	130576000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	91694000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y1M6D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y8M12D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0408
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0286
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	36378000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	30383000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	29694000	usd
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1367000	usd
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	421000	usd
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	609000	usd
CY2023	colb	Variable Lease Costs Income VariableLeaseCostsIncome	13000	usd
CY2022	colb	Variable Lease Costs Income VariableLeaseCostsIncome	26000	usd
CY2021	colb	Variable Lease Costs Income VariableLeaseCostsIncome	22000	usd
CY2023	us-gaap	Sublease Income SubleaseIncome	3173000	usd
CY2022	us-gaap	Sublease Income SubleaseIncome	2504000	usd
CY2021	us-gaap	Sublease Income SubleaseIncome	2626000	usd
CY2023	us-gaap	Lease Cost LeaseCost	34585000	usd
CY2022	us-gaap	Lease Cost LeaseCost	28326000	usd
CY2021	us-gaap	Lease Cost LeaseCost	27699000	usd
CY2023	colb	Rou Asset Impairment ROUAssetImpairment	2600000	usd
CY2022	colb	Rou Asset Impairment ROUAssetImpairment	1800000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	38384000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	30420000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	31697000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	73252000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	24954000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	15033000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	33857000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	28574000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	23394000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	16988000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	13457000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	33367000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	149637000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	19061000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	130576000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	185017000	usd
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	123615000	usd
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	92907000	usd
CY2023	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	5347000	usd
CY2022	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	24137000	usd
CY2021	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	38522000	usd
CY2023	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	57305000	usd
CY2022	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	0	usd
CY2021	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	0	usd
CY2023	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-17694000	usd
CY2022	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-20272000	usd
CY2021	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-18903000	usd
CY2023	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	-6122000	usd
CY2022	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	57537000	usd
CY2021	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	11089000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	109243000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	185017000	usd
CY2023	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	123615000	usd
CY2023Q4	colb	Balance Of Loans Serviced For Others BalanceOfLoansServicedForOthers	8175664000	usd
CY2022Q4	colb	Balance Of Loans Serviced For Others BalanceOfLoansServicedForOthers	13020189000	usd
CY2021Q4	colb	Balance Of Loans Serviced For Others BalanceOfLoansServicedForOthers	12755671000	usd
CY2023	colb	Mortgage Servicing Rights Percentage Of Serviced Loans MortgageServicingRightsPercentageOfServicedLoans	0.0134
CY2022	colb	Mortgage Servicing Rights Percentage Of Serviced Loans MortgageServicingRightsPercentageOfServicedLoans	0.0142
CY2021	colb	Mortgage Servicing Rights Percentage Of Serviced Loans MortgageServicingRightsPercentageOfServicedLoans	0.0097
CY2023	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	33400000	usd
CY2022	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	37400000	usd
CY2021	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	36800000	usd
CY2023	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	57300000	usd
CY2023Q4	colb	Residential Mortgage Loans Serviced For Others Disposal ResidentialMortgageLoansServicedForOthersDisposal	4300000000	usd
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.0678
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.0639
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.1275
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1025
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1006
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.0957
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P8Y3M18D
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P8Y8M12D
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P5Y10M24D
CY2023Q4	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of10 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed	2858000	usd
CY2022Q4	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of10 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed	4870000	usd
CY2023Q4	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of20 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed	5575000	usd
CY2022Q4	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of20 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed	9518000	usd
CY2023Q4	colb	Sensitivity Analysis Of Fair Value Transferors Interests In Transferred Financial Assets Impact Of One Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfOnePercentAdverseChangeInDiscountRate	4620000	usd
CY2022Q4	colb	Sensitivity Analysis Of Fair Value Transferors Interests In Transferred Financial Assets Impact Of One Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfOnePercentAdverseChangeInDiscountRate	8229000	usd
CY2023Q4	colb	Sensitivity Analysis Of Fair Value Transferors Interests In Transferred Financial Assets Impact Of Two Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfTwoPercentAdverseChangeInDiscountRate	8888000	usd
CY2022Q4	colb	Sensitivity Analysis Of Fair Value Transferors Interests In Transferred Financial Assets Impact Of Two Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfTwoPercentAdverseChangeInDiscountRate	15807000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	1000000000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	0	usd
CY2023	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	710200000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P10Y
CY2023Q4	colb	Tax Credit Impairment Adjustment TaxCreditImpairmentAdjustment	0	usd
CY2022Q4	colb	Tax Credit Impairment Adjustment TaxCreditImpairmentAdjustment	0	usd
CY2021Q4	colb	Tax Credit Impairment Adjustment TaxCreditImpairmentAdjustment	0	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	764791000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	161112000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	603679000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	54561000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	49816000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4745000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	111300000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4100000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4500000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	119431000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	105458000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	92545000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	79632000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	66719000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	139894000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	603679000	usd
CY2023Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	210873000	usd
CY2022Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	143719000	usd
CY2023Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	114082000	usd
CY2022Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	81632000	usd
CY2023	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	16777000	usd
CY2022	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	12026000	usd
CY2021	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	10003000	usd
CY2023	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	20932000	usd
CY2022	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	14553000	usd
CY2021	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	12253000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	72224000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	70982000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	71969000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	37365000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	28461000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	25086000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	109589000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	99443000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	97055000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6794000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11636000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	32099000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	6101000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2747000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8706000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12895000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14383000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	40805000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	122484000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	113826000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	137860000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.062
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.058
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.056
CY2023	colb	Effective Income Tax Rate Reconciliation Nondeductible Expense Fdic Premiums Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFDICPremiumsPercent	0.017
CY2022	colb	Effective Income Tax Rate Reconciliation Nondeductible Expense Fdic Premiums Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFDICPremiumsPercent	0.004
CY2021	colb	Effective Income Tax Rate Reconciliation Nondeductible Expense Fdic Premiums Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFDICPremiumsPercent	0.002
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.022
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.015
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.009
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.007
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.004
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.012
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.260
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.253
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.247
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	303465000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	140227000	usd
CY2023Q4	colb	Deferred Tax Assets Acquired Loans DeferredTaxAssetsAcquiredLoans	146315000	usd
CY2022Q4	colb	Deferred Tax Assets Acquired Loans DeferredTaxAssetsAcquiredLoans	4644000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	115777000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	79312000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Severance Payments DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments	39904000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Severance Payments DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments	16523000	usd
CY2023Q4	colb	Deferred Tax Asset Operating Lease Liabilities DeferredTaxAssetOperatingLeaseLiabilities	33956000	usd
CY2022Q4	colb	Deferred Tax Asset Operating Lease Liabilities DeferredTaxAssetOperatingLeaseLiabilities	23603000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	54181000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	35459000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	693598000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	299768000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	155642000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	156000	usd
CY2023Q4	colb	Deferred Tax Liability Leased Assets DeferredTaxLiabilityLeasedAssets	42825000	usd
CY2022Q4	colb	Deferred Tax Liability Leased Assets DeferredTaxLiabilityLeasedAssets	41120000	usd
CY2023Q4	colb	Deferred Tax Liability Deferred Loan Fees DeferredTaxLiabilityDeferredLoanFees	34402000	usd
CY2022Q4	colb	Deferred Tax Liability Deferred Loan Fees DeferredTaxLiabilityDeferredLoanFees	25676000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	31259000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	49681000	usd
CY2023Q4	colb	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	30117000	usd
CY2022Q4	colb	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	20235000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	20579000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1575000	usd
CY2023Q4	colb	Deferred Tax Liability Fair Value Market Value Adjustmenton Preferred Securities DeferredTaxLiabilityFairValueMarketValueAdjustmentonPreferredSecurities	17287000	usd
CY2022Q4	colb	Deferred Tax Liability Fair Value Market Value Adjustmenton Preferred Securities DeferredTaxLiabilityFairValueMarketValueAdjustmentonPreferredSecurities	15081000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	14284000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	13421000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	346395000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	166945000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	347203000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	132823000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	693600000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	299800000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	usd
CY2023Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	8044432000	usd
CY2022Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	4080469000	usd
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	10324454000	usd
CY2022Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	7721011000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2754113000	usd
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2265052000	usd
CY2023Q4	colb	Time Deposits Greater Than250000 TimeDepositsGreaterThan250000	1034094000	usd
CY2022Q4	colb	Time Deposits Greater Than250000 TimeDepositsGreaterThan250000	582838000	usd
CY2023Q4	colb	Time Deposits250000 Or Less TimeDeposits250000OrLess	5193475000	usd
CY2022Q4	colb	Time Deposits250000 Or Less TimeDeposits250000OrLess	2127393000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	27350568000	usd
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	16776763000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	6049079000	usd
CY2023Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year One TimeDepositsWeightedAverageInterestRateMaturitiesYearOne	0.0466
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	110413000	usd
CY2023Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Two TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo	0.0109
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	43357000	usd
CY2023Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Three TimeDepositsWeightedAverageInterestRateMaturitiesYearThree	0.0042
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	16651000	usd
CY2023Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Four TimeDepositsWeightedAverageInterestRateMaturitiesYearFour	0.0012
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	5789000	usd
CY2023Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Five TimeDepositsWeightedAverageInterestRateMaturitiesYearFive	0.0012
CY2023Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	2280000	usd
CY2023Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Greater Than Five Years TimeDepositsWeightedAverageInterestRateMaturitiesGreaterThanFiveYears	0.0105
CY2023Q4	us-gaap	Time Deposits TimeDeposits	6227569000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit Time Deposits WeightedAverageRateDomesticDepositTimeDeposits	0.0455
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	252119000	usd
CY2023Q4	colb	Weighted Average Interest Rate WeightedAverageInterestRate	0.0238
CY2023Q4	colb	Carrying Value Of Underlying Assets Repurchase Agreements CarryingValueOfUnderlyingAssetsRepurchaseAgreements	358162000	usd
CY2023Q4	colb	Market Value Of Underlying Assets Repurchase Agreements MarketValueOfUnderlyingAssetsRepurchaseAgreements	358162000	usd
CY2022Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	308769000	usd
CY2022Q4	colb	Weighted Average Interest Rate WeightedAverageInterestRate	0.0019
CY2022Q4	colb	Carrying Value Of Underlying Assets Repurchase Agreements CarryingValueOfUnderlyingAssetsRepurchaseAgreements	456922000	usd
CY2022Q4	colb	Market Value Of Underlying Assets Repurchase Agreements MarketValueOfUnderlyingAssetsRepurchaseAgreements	456922000	usd
CY2023Q4	colb	Securities Sold Under Agreements To Repurchase Average SecuritiesSoldUnderAgreementsToRepurchaseAverage	267688000	usd
CY2022Q4	colb	Securities Sold Under Agreements To Repurchase Average SecuritiesSoldUnderAgreementsToRepurchaseAverage	451612000	usd
CY2021Q4	colb	Securities Sold Under Agreements To Repurchase Average SecuritiesSoldUnderAgreementsToRepurchaseAverage	454992000	usd
CY2023Q4	colb	Securities Sold Under Agreements To Repurchase Maximum Outstanding SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstanding	304605000	usd
CY2022Q4	colb	Securities Sold Under Agreements To Repurchase Maximum Outstanding SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstanding	532449000	usd
CY2021Q4	colb	Securities Sold Under Agreements To Repurchase Maximum Outstanding SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstanding	537581000	usd
CY2023Q4	us-gaap	Other Borrowings OtherBorrowings	4000000000	usd
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	906200000	usd
CY2023Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	3800000000	usd
CY2023	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding	4458463000	usd
CY2022	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding	225411000	usd
CY2021	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding	194575000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	6400000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	905000000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	645000000	usd
CY2023	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.053
CY2022	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.041
CY2021	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.016
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.056
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.047
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.071
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	19100000000	usd
CY2022Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	usd
CY2023Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	8200000000	usd
CY2023Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	475272000	usd
CY2023Q4	colb	Carrying Value Of Trust CarryingValueOfTrust	414335000	usd
CY2023Q4	colb	Common Stock Issued By Trust Owned CommonStockIssuedByTrustOwned	14300000	usd
CY2022Q4	colb	Common Stock Issued By Trust Owned CommonStockIssuedByTrustOwned	14000000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	7900000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-28800000	usd
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	20900000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	10600000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	10900000	usd
CY2023	colb	Look Back Period Under Employee Stock Purchase Plan LookBackPeriodUnderEmployeeStockPurchasePlan	P6M
CY2023	colb	Discount On Common Stock Under Employee Stock Purchase Plan Percent DiscountOnCommonStockUnderEmployeeStockPurchasePlanPercent	0.10
CY2023	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	58440	shares
CY2023	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1200000	usd
CY2023Q4	colb	Shares Available For Purchase Under Employee Stock Purchase Plan SharesAvailableForPurchaseUnderEmployeeStockPurchasePlan	27206	shares
CY2023	colb	Postemployment Benefits Minimum Contractual Term PostemploymentBenefitsMinimumContractualTerm	P10Y
CY2023	colb	Postemployment Benefits Maximum Contractual Term PostemploymentBenefitsMaximumContractualTerm	P20Y
CY2023	colb	Present Value Of Future Salary Contribution Plan Benefits PresentValueOfFutureSalaryContributionPlanBenefits	49000000	usd
CY2022	colb	Present Value Of Future Salary Contribution Plan Benefits PresentValueOfFutureSalaryContributionPlanBenefits	25600000	usd
CY2023	us-gaap	Postemployment Benefits Period Expense PostemploymentBenefitsPeriodExpense	4800000	usd
CY2022	us-gaap	Postemployment Benefits Period Expense PostemploymentBenefitsPeriodExpense	1500000	usd
CY2021	us-gaap	Postemployment Benefits Period Expense PostemploymentBenefitsPeriodExpense	2200000	usd
CY2023Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Current And Noncurrent DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent	13700000	usd
CY2022Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Current And Noncurrent DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent	11400000	usd
CY2023Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	680900000	usd
CY2022Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	331800000	usd
CY2023Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	6300000	usd
CY2022Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	4000000	usd
CY2022Q4	colb	Standby Lettersof Credit Drawings StandbyLettersofCreditDrawings	0	usd
CY2023Q4	colb	Standby Lettersof Credit Drawings StandbyLettersofCreditDrawings	0	usd
CY2023Q4	colb	Standby Letters Of Credit Expires Within One Year StandbyLettersOfCreditExpiresWithinOneYear	198500000	usd
CY2023Q4	colb	Standby Letters Of Credit Expire Thereafter StandbyLettersOfCreditExpireThereafter	14000000	usd
CY2023	colb	Standby Letters Of Credit Fees StandbyLettersOfCreditFees	2500000	usd
CY2022	colb	Standby Letters Of Credit Fees StandbyLettersOfCreditFees	1900000	usd
CY2023Q4	colb	Mortgage Loans On Real Estate Repurchase Reserve Liability MortgageLoansOnRealEstateRepurchaseReserveLiability	200000	usd
CY2023	colb	Dayspastdueof Gnm Aloansavailableforrepurchase DayspastdueofGNMAloansavailableforrepurchase	P90D
CY2023Q4	colb	Gnma Loanspastdueby90daysbutnotyetrepurchased GNMALoanspastdueby90daysbutnotyetrepurchased	1000000	usd
CY2023Q4	colb	Prior Bankruptcy Recoveries By Plaintiffs PriorBankruptcyRecoveriesByPlaintiffs	110000000	usd
CY2023Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	5700000	usd
CY2023	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
CY2021	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
CY2022	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
CY2023Q4	us-gaap	Collateralized Financings CollateralizedFinancings	815000	usd
CY2022Q4	us-gaap	Collateralized Financings CollateralizedFinancings	3800000	usd
CY2023Q4	colb	Termination Value Of Derivatives In Net Liability Position TerminationValueOfDerivativesInNetLiabilityPosition	260100000	usd
CY2022Q4	colb	Termination Value Of Derivatives In Net Liability Position TerminationValueOfDerivativesInNetLiabilityPosition	270000000	usd
CY2023Q4	colb	Collateral Posting Clearing CollateralPostingClearing	88300000	usd
CY2022Q4	colb	Collateral Posting Clearing CollateralPostingClearing	89500000	usd
CY2023Q4	colb	Variation Margin Payment VariationMarginPayment	166300000	usd
CY2022Q4	colb	Variation Margin Payment VariationMarginPayment	209500000	usd
CY2023Q4	colb	Customer Swaps Offset By A Swap Executed On A Bilateral Basis With A Counterparty Bank CustomerSwapsOffsetByASwapExecutedOnABilateralBasisWithACounterpartyBank	252
CY2022Q4	colb	Customer Swaps Offset By A Swap Executed On A Bilateral Basis With A Counterparty Bank CustomerSwapsOffsetByASwapExecutedOnABilateralBasisWithACounterpartyBank	71
CY2023Q4	colb	Counterparty Bank Cash As Collateral On Bilateral Positions CounterpartyBankCashAsCollateralOnBilateralPositions	61600000	usd
CY2022Q4	colb	Counterparty Bank Cash As Collateral On Bilateral Positions CounterpartyBankCashAsCollateralOnBilateralPositions	51900000	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	38085000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	15444000	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	261091000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	271205000	usd
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-9285000	usd
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	44979000	usd
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	5356000	usd
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13700000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9300000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9500000	usd
CY2023	colb	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Assumed In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedInPeriod	290000	shares
CY2023	colb	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Assumed In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedInPeriodWeightedAverageGrantDateFairValue	30.17
CY2023Q4	colb	Tier One Risk Based Common Equity Required To Be Well Capitalized To Risk Weighted Assets Capital Conservation Buffer TierOneRiskBasedCommonEquityRequiredToBeWellCapitalizedToRiskWeightedAssetsCapitalConservationBuffer	0.07
CY2023Q4	colb	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Capital Conservation Buffer TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssetsCapitalConservationBuffer	0.085
CY2023Q4	colb	Capital Required To Be Well Capitalized To Risk Weighted Assets Capital Conservation Buffer CapitalRequiredToBeWellCapitalizedToRiskWeightedAssetsCapitalConservationBuffer	0.105
CY2023Q4	colb	Current Expected Credit Loss Cumulative Adjustment Phase Out Percentage Year One CurrentExpectedCreditLossCumulativeAdjustmentPhaseOutPercentageYearOne	0.75
CY2023Q4	colb	Current Expected Credit Loss Cumulative Adjustment Phase Out Percentage Year Two CurrentExpectedCreditLossCumulativeAdjustmentPhaseOutPercentageYearTwo	0.50
CY2023Q4	colb	Current Expected Credit Loss Cumulative Adjustment Phase Out Percentage Year Three CurrentExpectedCreditLossCumulativeAdjustmentPhaseOutPercentageYearThree	0.25
CY2023Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	30715000	usd
CY2023Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	275140000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	109243000	usd
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	9360048000	usd
CY2023Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Subordinated Debt Obligations FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations	316440000	usd
CY2023Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	577531000	usd
CY2022Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	71647000	usd
CY2022Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	285581000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	185017000	usd
CY2022Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	3826814000	usd
CY2022Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Subordinated Debt Obligations FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations	323639000	usd
CY2022Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	594844000	usd
CY2023Q4	colb	Fair Value Portfolio Loans FairValuePortfolioLoans	275100000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	7900000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	5800000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-28800000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-21400000	usd
CY2023Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	30715000	usd
CY2023Q4	colb	Fair Value Option Aggregate Unpaid Balance Loans And Long Term Receivables FairValueOptionAggregateUnpaidBalanceLoansAndLongTermReceivables	29629000	usd
CY2023Q4	us-gaap	Fair Value Option Aggregate Differences Loans And Long Term Receivables FairValueOptionAggregateDifferencesLoansAndLongTermReceivables	1086000	usd
CY2022Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	71647000	usd
CY2022Q4	colb	Fair Value Option Aggregate Unpaid Balance Loans And Long Term Receivables FairValueOptionAggregateUnpaidBalanceLoansAndLongTermReceivables	70219000	usd
CY2022Q4	us-gaap	Fair Value Option Aggregate Differences Loans And Long Term Receivables FairValueOptionAggregateDifferencesLoansAndLongTermReceivables	1428000	usd
CY2023Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	275140000	usd
CY2023Q4	colb	Fair Value Loans Held As Assets Aggregate Unpaid Balance Loans And Long Term Receivables FairValueLoansHeldAsAssetsAggregateUnpaidBalanceLoansAndLongTermReceivables	320397000	usd
CY2023Q4	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	-45257000	usd
CY2022Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	285581000	usd
CY2022Q4	colb	Fair Value Loans Held As Assets Aggregate Unpaid Balance Loans And Long Term Receivables FairValueLoansHeldAsAssetsAggregateUnpaidBalanceLoansAndLongTermReceivables	333469000	usd
CY2022Q4	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	-47888000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	348715000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	336752000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	420300000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	195304000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	129277000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	130499000	shares
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	567000	shares
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	455000	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	531000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	195871000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129732000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	131030000	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.79
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.22
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.78
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.60
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.21
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	727000	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2410000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	7564000	usd
CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	9393000	usd
CY2023	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	46483000	usd
CY2022	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	630000	usd
CY2021	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	980000	usd
CY2023	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	45810000	usd
CY2022	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	5784000	usd
CY2021	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	2809000	usd
CY2023	colb	Loans And Leases Receivable Related Parties Reclassification Adjustment LoansAndLeasesReceivableRelatedPartiesReclassificationAdjustment	2157000	usd
CY2022	colb	Loans And Leases Receivable Related Parties Reclassification Adjustment LoansAndLeasesReceivableRelatedPartiesReclassificationAdjustment	0	usd
CY2021	colb	Loans And Leases Receivable Related Parties Reclassification Adjustment LoansAndLeasesReceivableRelatedPartiesReclassificationAdjustment	0	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	926000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2410000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	7564000	usd
CY2023Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	8400000	usd
CY2022Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	19100000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	134259000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	85825000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	83312000	usd
CY2023	colb	Other Income Remaining OtherIncomeRemaining	69668000	usd
CY2022	colb	Other Income Remaining OtherIncomeRemaining	113703000	usd
CY2021	colb	Other Income Remaining OtherIncomeRemaining	273006000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	203927000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	199528000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	356318000	usd
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.35
CY2023Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.36
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.36
CY2023Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.36
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
colb-20231231_cal.xml	Edgar Link	unprocessable
0000887343-24-000089-index-headers.html	Edgar Link	pending
0000887343-24-000089-index.html	Edgar Link	pending
0000887343-24-000089.txt	Edgar Link	pending
0000887343-24-000089-xbrl.zip	Edgar Link	pending
colb-20231231.htm	Edgar Link	pending
colb-20231231.xsd	Edgar Link	pending
colb-20231231xex1071.htm	Edgar Link	pending
colb-20231231xex191.htm	Edgar Link	pending
colb-20231231xex211.htm	Edgar Link	pending
colb-20231231xex231.htm	Edgar Link	pending
colb-20231231xex311.htm	Edgar Link	pending
colb-20231231xex312.htm	Edgar Link	pending
colb-20231231xex313.htm	Edgar Link	pending
colb-20231231xex32.htm	Edgar Link	pending
colb-20231231xex971.htm	Edgar Link	pending
colb-20231231_g1.jpg	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R116.htm	Edgar Link	pending
R117.htm	Edgar Link	pending
R118.htm	Edgar Link	pending
R119.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R120.htm	Edgar Link	pending
R121.htm	Edgar Link	pending
R122.htm	Edgar Link	pending
R123.htm	Edgar Link	pending
colb-20231231_def.xml	Edgar Link	unprocessable
colb-20231231_lab.xml	Edgar Link	unprocessable
colb-20231231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
colb-20231231_htm.xml	Edgar Link	completed
R124.htm	Edgar Link	pending
R125.htm	Edgar Link	pending
R126.htm	Edgar Link	pending
R127.htm	Edgar Link	pending
R128.htm	Edgar Link	pending
R129.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R130.htm	Edgar Link	pending
R131.htm	Edgar Link	pending
R132.htm	Edgar Link	pending
R133.htm	Edgar Link	pending
R134.htm	Edgar Link	pending
R135.htm	Edgar Link	pending
R136.htm	Edgar Link	pending
R137.htm	Edgar Link	pending
R138.htm	Edgar Link	pending
R139.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R140.htm	Edgar Link	pending
R141.htm	Edgar Link	pending
R142.htm	Edgar Link	pending
R143.htm	Edgar Link	pending
R144.htm	Edgar Link	pending
R145.htm	Edgar Link	pending
R146.htm	Edgar Link	pending
R147.htm	Edgar Link	pending
R148.htm	Edgar Link	pending
R149.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R150.htm	Edgar Link	pending
R151.htm	Edgar Link	pending
R152.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
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.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

$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb

2024 Q1 Form 10-K Financial Statement

#000088734324000089 Filed on February 27, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB COLUMBIA BANKING SYSTEM, INC. Stock $colb

2024 Q1 Form 10-K Financial Statement

#000088734324000089 Filed on February 27, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb