$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb

$colb Overview Financials Valuation SEC Filings Company Website

2023 Q4 Form 10-Q Financial Statement

#000088734323000307 Filed on November 03, 2023

Income Statement

Concept	2023 Q4	2023 Q3	2022 Q3
Revenue		$696.0M	$167.7M
YoY Change		314.92%	24.68%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development			$10.55M
YoY Change			23.88%
% of Gross Profit
Depreciation & Amortization	$41.85M	$39.30M	$13.37M
YoY Change	220.78%	193.9%	210.98%
% of Gross Profit
Operating Expenses			$10.55M
YoY Change			23.88%
Operating Profit
YoY Change
Interest Expense		$215.1M	$5.256M
YoY Change		3993.19%	162.8%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$127.1M	$184.0M	$82.42M
YoY Change	45.86%	123.24%	23.96%
Income Tax	$33.54M	$48.13M	$17.48M
% Of Pretax Income	26.39%	26.16%	21.21%
Net Earnings	$93.53M	$135.8M	$64.94M
YoY Change	35.74%	109.18%	22.49%
Net Earnings / Revenue		19.52%	38.71%
Basic Earnings Per Share		$0.65	$0.83
Diluted Earnings Per Share	$0.45	$0.65	$0.83
COMMON SHARES
Basic Shares Outstanding	208.6M shares	208.6M shares	78.65M shares
Diluted Shares Outstanding		208.6M shares	78.23M shares

Balance Sheet

Concept	2023 Q4	2023 Q3	2022 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$2.163B	$2.404B	$317.7M
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	$454.8M	$337.9M	$161.9M
YoY Change	183.22%	108.74%	2.77%
Goodwill	$1.000B	$1.000B	$823.2M
YoY Change	21.48%	21.48%	7.49%
Intangibles	$603.7M	$636.9M	$27.92M
YoY Change	2226.41%	2181.02%	32.18%
Long-Term Investments
YoY Change
Other Assets	$347.2M	$470.0M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$52.17B	$51.99B	$20.41B
YoY Change	157.45%	154.8%	9.69%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$130.6M	$130.0M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$252.1M	$35.00M	$48.73M
YoY Change	164.92%	-28.18%	21.83%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$382.7M	$388.0M	$48.73M
YoY Change	302.13%	696.18%	21.83%
LONG-TERM LIABILITIES
Long-Term Debt	$4.374B	$4.424B	$20.31M
YoY Change	21437.84%	21682.37%	-41.97%
Other Long-Term Liabilities	$814.5M	$925.0M	$265.2M
YoY Change	200.06%	248.8%	9.13%
Total Long-Term Liabilities	$5.189B	$5.349B	$285.5M
YoY Change	1678.48%	1773.5%	2.7%
TOTAL LIABILITIES
Total Short-Term Liabilities	$382.7M	$388.0M	$48.73M
Total Long-Term Liabilities	$5.189B	$5.349B	$285.5M
Total Liabilities	$47.18B	$47.36B	$18.29B
YoY Change	161.34%	158.95%	12.35%
SHAREHOLDERS EQUITY
Retained Earnings	-$467.6M	-$485.6M	$804.8M
YoY Change	-155.01%	-160.34%	23.56%
Common Stock	$5.803B	$5.798B	$1.940B
YoY Change	198.42%	198.82%	16.19%
Preferred Stock
YoY Change
Treasury Stock (at cost)			$70.83M
YoY Change			0.0%
Treasury Stock Shares			2.184M shares
Shareholders Equity	$4.995B	$4.632B	$2.115B
YoY Change
Total Liabilities & Shareholders Equity	$52.17B	$51.99B	$20.41B
YoY Change	157.45%	154.8%	9.69%

Cashflow Statement

Concept	2023 Q4	2023 Q3	2022 Q3
OPERATING ACTIVITIES
Net Income	$93.53M	$135.8M	$64.94M
YoY Change	35.74%	109.18%	22.49%
Depreciation, Depletion And Amortization	$41.85M	$39.30M	$13.37M
YoY Change	220.78%	193.9%	210.98%
Cash From Operating Activities	$92.34M	$350.1M	$62.15M
YoY Change	19.97%	463.28%	0.74%
INVESTING ACTIVITIES
Capital Expenditures			-$1.918M
YoY Change			59.83%
Acquisitions
YoY Change
Other Investing Activities	-$200.1M	$228.5M	-$104.3M
YoY Change	-220.91%	-319.01%	-81.13%
Cash From Investing Activities	-$200.1M	$232.0M	-$106.2M
YoY Change	-222.13%	-318.35%	-80.83%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-133.5M	-1.586B	-52.43M
YoY Change	-49.95%	2924.45%	-109.39%
NET CHANGE
Cash From Operating Activities	92.34M	350.1M	62.15M
Cash From Investing Activities	-200.1M	232.0M	-106.2M
Cash From Financing Activities	-133.5M	-1.586B	-52.43M
Net Change In Cash	-241.2M	-1.004B	-96.52M
YoY Change	830.09%	939.67%	-246.24%
FREE CASH FLOW
Cash From Operating Activities	$92.34M	$350.1M	$62.15M
Capital Expenditures			-$1.918M
Free Cash Flow			$64.07M
YoY Change			1.86%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023Q1	colb	Merger Share Exchange Ratio MergerShareExchangeRatio	0.5958
CY2022Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	278830000	usd
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	1535874000	usd
CY2023Q3	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	80066000	usd
CY2022Q3	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	18175000	usd
	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	198831000	usd
CY2023Q3	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	6929000	usd
CY2022Q3	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1322000	usd
	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	17143000	usd
CY2023Q3	us-gaap	Dividend Income Operating DividendIncomeOperating	4941000	usd
CY2022Q3	us-gaap	Dividend Income Operating DividendIncomeOperating	86000	usd
	us-gaap	Dividend Income Operating DividendIncomeOperating	8241000	usd
CY2023Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	34407000	usd
CY2022Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	5115000	usd
CY2023Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	696013000	usd
	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	2697000	usd
CY2022Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	798000	usd
	us-gaap	Interest Expense Debt InterestExpenseDebt	186848000	usd
CY2023Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	9864000	usd
CY2022Q3	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	5491000	usd
	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	27605000	usd
CY2023Q3	us-gaap	Interest Expense InterestExpense	215138000	usd
CY2022Q3	us-gaap	Interest Expense InterestExpense	15924000	usd
	us-gaap	Interest Expense InterestExpense	508145000	usd
CY2023Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	480875000	usd
CY2022Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	287604000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1339548000	usd
CY2023Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	36737000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	158290000	usd
CY2023Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	444138000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1181258000	usd
CY2023Q3	colb	Residential Mortgage Banking Revenue Loss Net ResidentialMortgageBankingRevenueLossNet	7103000	usd
CY2022Q3	colb	Residential Mortgage Banking Revenue Loss Net ResidentialMortgageBankingRevenueLossNet	17341000	usd
	colb	Residential Mortgage Banking Revenue Loss Net ResidentialMortgageBankingRevenueLossNet	12577000	usd
CY2023Q3	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	4000	usd
CY2022Q3	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	0	usd
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	4000	usd
CY2023Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-2055000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-2647000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-336000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	3253000	usd
CY2023Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4440000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	11293000	usd
CY2023Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	-5117000	usd
CY2022Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	-10571000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	12297000	usd
CY2023Q3	us-gaap	Noninterest Income NoninterestIncome	43981000	usd
CY2022Q3	us-gaap	Noninterest Income NoninterestIncome	29445000	usd
	us-gaap	Noninterest Income NoninterestIncome	138394000	usd
CY2023Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	159041000	usd
CY2022Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	109164000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	458531000	usd
CY2023Q3	us-gaap	Occupancy Net OccupancyNet	43070000	usd
CY2022Q3	us-gaap	Occupancy Net OccupancyNet	35042000	usd
	us-gaap	Occupancy Net OccupancyNet	135320000	usd
CY2023Q3	us-gaap	Communication Communication	4589000	usd
CY2022Q3	us-gaap	Communication Communication	2542000	usd
	us-gaap	Communication Communication	11972000	usd
CY2023Q3	us-gaap	Marketing Expense MarketingExpense	2886000	usd
CY2022Q3	us-gaap	Marketing Expense MarketingExpense	1505000	usd
	us-gaap	Marketing Expense MarketingExpense	5882000	usd
CY2023Q3	us-gaap	Professional Fees ProfessionalFees	14341000	usd
CY2022Q3	us-gaap	Professional Fees ProfessionalFees	13355000	usd
	us-gaap	Professional Fees ProfessionalFees	41278000	usd
CY2023Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	11200000	usd
CY2022Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3007000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29879000	usd
CY2022Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1025000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	78092000	usd
CY2023Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	18938000	usd
CY2022Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	769000	usd
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	164485000	usd
CY2022Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	11555000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	51072000	usd
CY2023Q3	us-gaap	Noninterest Expense NoninterestExpense	304147000	usd
CY2022Q3	us-gaap	Noninterest Expense NoninterestExpense	177964000	usd
	us-gaap	Noninterest Expense NoninterestExpense	975524000	usd
CY2022Q3	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	111513000	usd
	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	344128000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	48127000	usd
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	208070000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	129319000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	190997000	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	208645000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129733000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	191546000	shares
CY2023Q1	colb	Merger Share Exchange Ratio MergerShareExchangeRatio	0.5958
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	135845000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	84040000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-333993000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-186336000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	4000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-247159000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-138410000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-19677000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-4043000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	-5116000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	-1040000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-14561000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-3003000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-72000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-19000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-53000	usd
CY2022Q3	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
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-261667000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-141413000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-125822000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-57373000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2749270000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	91157000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-185515000	usd
CY2022Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4037000	usd
CY2022Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	usd
CY2022Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.35
CY2022Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2607598000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	78591000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-124391000	usd
CY2022Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2283000	usd
CY2022Q2	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	72000	usd
CY2022Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	54000	usd
CY2022Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.35
CY2022Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45787000	usd
CY2022Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2518276000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	84040000	usd
CY2022Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2517000	usd
CY2022Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	41000	usd
CY2022Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	usd
CY2022Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.35
CY2022Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45865000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2417514000	usd
CY2022Q4	us-gaap	Net Income Loss NetIncomeLoss	82964000	usd
CY2022Q4	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	22696000	usd
CY2022Q4	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2499000	usd
CY2022Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.35
CY2022Q4	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45834000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2479826000	usd
CY2023Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2023Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2023Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	208575479	shares
CY2023Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	208575479	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129320962	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	129320962	shares
CY2022Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	27572000	usd
CY2022Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	260032000	usd
CY2023Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1871000	usd
CY2022Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1525000	usd
CY2022Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2023000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	28892000	usd
CY2023Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20203000	usd
CY2023Q3	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	183972000	usd
CY2022Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27473000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	88944000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	135845000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	84040000	usd
	us-gaap	Net Income Loss NetIncomeLoss	255184000	usd
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-86837000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-47926000	usd
CY2022Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2454000	usd
CY2022Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45731000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-141413000	usd
CY2022Q4	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	13000	usd
CY2022Q4	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2479826000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	-14038000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	126730000	usd
CY2023Q1	us-gaap	Stock Issued During Period Shares Acquisitions StockIssuedDuringPeriodSharesAcquisitions	78863112	shares
CY2023Q1	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	2337632000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	2337632000	usd
CY2023Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5644000	usd
CY2023Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5216000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	usd
CY2023Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.35
CY2023Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45855000	usd
CY2023Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4884723000	usd
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	133377000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-118628000	usd
CY2023Q2	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	1646000	usd
CY2023Q2	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	1646000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-261667000	usd
CY2023Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4338000	usd
CY2023Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	148000	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1185000	usd
CY2023Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.36
CY2023Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	75579000	usd
CY2023Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4632162000	usd
CY2023Q1	colb	Merger Share Exchange Ratio MergerShareExchangeRatio	0.5958
	us-gaap	Net Income Loss NetIncomeLoss	255184000	usd
	us-gaap	Net Income Loss NetIncomeLoss	253788000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	47972000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-5089000	usd
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	4000	usd
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	2000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	158290000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	51068000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	11484000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	6293000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	102409000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	21560000	usd
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	27438000	usd
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2203000	usd
	colb	Increase In Mortgage Servicing Rights Carried At Fair Value IncreaseInMortgageServicingRightsCarriedAtFairValue	4427000	usd
	colb	Increase In Mortgage Servicing Rights Carried At Fair Value IncreaseInMortgageServicingRightsCarriedAtFairValue	20397000	usd
	colb	Change In Fair Value Of Residential Mortgage Servicing Rights Carried At Fair Value ChangeInFairValueOfResidentialMortgageServicingRightsCarriedAtFairValue	-14350000	usd
	colb	Change In Fair Value Of Residential Mortgage Servicing Rights Carried At Fair Value ChangeInFairValueOfResidentialMortgageServicingRightsCarriedAtFairValue	52165000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	13317000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	7254000	usd
	colb	Increase Decreasein Equity Securities IncreaseDecreaseinEquitySecurities	-273000	usd
	colb	Increase Decreasein Equity Securities IncreaseDecreaseinEquitySecurities	-1554000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-336000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-7383000	usd
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	7715000	usd
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	-207000	usd
	us-gaap	Increase Decrease In Mortgage Loans Held For Sale IncreaseDecreaseInMortgageLoansHeldForSale	-1118000	usd
	us-gaap	Increase Decrease In Mortgage Loans Held For Sale IncreaseDecreaseInMortgageLoansHeldForSale	-14616000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	354535000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	1622633000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	485761000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	1793676000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	26185000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-203802000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	26191000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	248362000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	577469000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	904666000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	920899000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	175656000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1552199000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	328685000	usd
	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	238066000	usd
	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	164344000	usd
	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	218696000	usd
	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	134267000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	991404000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	3064741000	usd
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	701647000	usd
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	111584000	usd
	colb	Change In Premises And Equipment ChangeInPremisesAndEquipment	-44055000	usd
	colb	Change In Premises And Equipment ChangeInPremisesAndEquipment	11259000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	3020000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4069000	usd
	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	57454000	usd
	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	usd
	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	-274587000	usd
	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	0	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-468000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1997000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	701757000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2835398000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-633969000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	222437000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	14000000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	0	usd
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-120411000	usd
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-108678000	usd
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	12100000000	usd
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	750000000	usd
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	11301522000	usd
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	0	usd
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1185000	usd
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	54000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	195351000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	136693000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6106000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4150000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-170174000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	722970000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1109052000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1207762000	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
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2403695000	usd
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1553859000	usd
	us-gaap	Interest Paid Net InterestPaidNet	456797000	usd
	us-gaap	Interest Paid Net InterestPaidNet	33154000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	80226000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	44174000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-247397000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-427691000	usd
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-6292000	usd
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-23628000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-124000	usd
	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
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	118085000	usd
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	usd
CY2023Q3	colb	Number Of Wholly Owned Trusts NumberOfWhollyOwnedTrusts	23	trust
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Business Combinations</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">-The Company applies the acquisition method of accounting for business combinations. Under the acquisition method, the acquiring entity recognizes the assets acquired and liabilities assumed at their acquisition date fair values. Management utilizes prevailing valuation techniques appropriate for the asset or liability being measured in determining these fair values. This method often involves estimates based on third party valuations or internal valuations based on discounted cash flow analyses or other valuation techniques, all of which are inherently subjective. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value if the fair value can be determined during the measurement period. Acquisition‑related costs, including conversion and restructuring charges, are expensed as incurred. Fair values are subject to refinement over the measurement period, not to exceed one year after the closing date.</span>
	colb	Cash And Cash Equivalents General Maturity CashAndCashEquivalentsGeneralMaturity	P90D
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3197000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	5772448000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	245427000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2704482000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	631090000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	8476930000	usd
	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, and financial services 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%"> consists 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 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">Finance 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, merchant fee income, 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.
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
	us-gaap	Derivatives Methods Of Accounting Nonhedging Derivatives DerivativesMethodsOfAccountingNonhedgingDerivatives	<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>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.
CY2023Q2	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	908000	usd
CY2023Q3	colb	Business Combination Acquisition Related Costs Communication BusinessCombinationAcquisitionRelatedCostsCommunication	0	usd
CY2022Q3	colb	Business Combination Acquisition Related Costs Communication BusinessCombinationAcquisitionRelatedCostsCommunication	0	usd
	colb	Business Combination Acquisition Related Costs Communication BusinessCombinationAcquisitionRelatedCostsCommunication	20000000	usd
	colb	Business Combination Acquisition Related Costs Communication BusinessCombinationAcquisitionRelatedCostsCommunication	0	usd
CY2023Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9380403000	usd
CY2023Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	100000	usd
CY2023Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	876517000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8503986000	usd
CY2023Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2344000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	714000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	usd
CY2023Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3058000	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
CY2023Q3	us-gaap	Financial Instruments Owned At Fair Value FinancialInstrumentsOwnedAtFairValue	3735683000	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	876517000	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
CY2023Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	1490	branches
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	473	branches
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	26219000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	26100000	usd
CY2023Q3	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	0	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	0	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	1974579000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1909880000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	3000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	2591611000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2406645000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	3000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	13000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	4787994000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	4161361000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	2338000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	3042000	usd
CY2023Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9380403000	usd
CY2023Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8503986000	usd
CY2023Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2344000	usd
CY2023Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3058000	usd
CY2023Q3	colb	Pledged Assets Not Separately Reported Securities Pledged For State And Local Governments PledgedAssetsNotSeparatelyReportedSecuritiesPledgedForStateAndLocalGovernments	1505158000	usd
CY2023Q3	colb	Pledged Assets Separately Reported Securities Pledged For State And Local Governments At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedForStateAndLocalGovernmentsAtFairValue	1305616000	usd
CY2023Q3	colb	Pledged Assets Not Separately Reported Repurchase Agreement PledgedAssetsNotSeparatelyReportedRepurchaseAgreement	392939000	usd
CY2023Q3	colb	Pledged Assets Separately Reported Repurchase Agreement PledgedAssetsSeparatelyReportedRepurchaseAgreement	348187000	usd
CY2023Q3	colb	Financial Instruments Other At Amortized Cost FinancialInstrumentsOtherAtAmortizedCost	2321670000	usd
CY2023Q3	us-gaap	Financial Instruments Owned Other At Fair Value FinancialInstrumentsOwnedOtherAtFairValue	2081880000	usd
CY2023Q3	colb	Financial Instruments Owned At Amortized Cost FinancialInstrumentsOwnedAtAmortizedCost	4219767000	usd
CY2023Q3	colb	Loans Receivable Commercial Re Nonowneroccupiedtermnet LoansReceivableCommercialRENonowneroccupiedtermnet	6490638000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Nonowneroccupiedtermnet LoansReceivableCommercialRENonowneroccupiedtermnet	3894840000	usd
CY2023Q3	colb	Loans Receivable Commercial Re Owner Occupied Term Net LoansReceivableCommercialREOwnerOccupiedTermNet	5235227000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Owner Occupied Term Net LoansReceivableCommercialREOwnerOccupiedTermNet	2567761000	usd
CY2023Q3	colb	Loans Receivable Commercial Re Multifamily Net LoansReceivableCommercialREMultifamilyNet	5684495000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Multifamily Net LoansReceivableCommercialREMultifamilyNet	5285791000	usd
CY2023Q3	colb	Loans Receivable Commercial Re Construction Development Net LoansReceivableCommercialREConstructionDevelopmentNet	1669918000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Construction Development Net LoansReceivableCommercialREConstructionDevelopmentNet	1077346000	usd
CY2023Q3	colb	Loans Receivable Commercial Re Residential Development Net LoansReceivableCommercialREResidentialDevelopmentNet	354922000	usd
CY2022Q4	colb	Loans Receivable Commercial Re Residential Development Net LoansReceivableCommercialREResidentialDevelopmentNet	200838000	usd
CY2023Q3	colb	Loans Receivable Commercial Term LoansReceivableCommercialTerm	5437915000	usd
CY2022Q4	colb	Loans Receivable Commercial Term LoansReceivableCommercialTerm	3029547000	usd
CY2023Q3	colb	Loans Receivable Commercial Loc And Other LoansReceivableCommercialLocAndOther	2353548000	usd
CY2022Q4	colb	Loans Receivable Commercial Loc And Other LoansReceivableCommercialLocAndOther	960054000	usd
CY2023Q3	colb	Loans Receivable Commercial Leases And Equipment Finance LoansReceivableCommercialLeasesAndEquipmentFinance	1728991000	usd
CY2022Q4	colb	Loans Receivable Commercial Leases And Equipment Finance LoansReceivableCommercialLeasesAndEquipmentFinance	1706172000	usd
CY2023Q3	colb	Loan Receivable Residential Mortgage Net LoanReceivableResidentialMortgageNet	6121838000	usd
CY2022Q4	colb	Loan Receivable Residential Mortgage Net LoanReceivableResidentialMortgageNet	5647035000	usd
CY2023Q3	colb	Loan Receivable Residential Hell Net LoanReceivableResidentialHELLNet	1899948000	usd
CY2022Q4	colb	Loan Receivable Residential Hell Net LoanReceivableResidentialHELLNet	1631965000	usd
CY2023Q3	colb	Loan Receivable Consumer Other Net LoanReceivableConsumerOtherNet	193158000	usd
CY2022Q4	colb	Loan Receivable Consumer Other Net LoanReceivableConsumerOtherNet	154632000	usd
CY2023Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	37170598000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	26155981000	usd
CY2023Q3	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	75800000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	84700000	usd
CY2023Q3	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	587200000	usd
CY2022Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	6100000	usd
	us-gaap	Loans Receivable Held For Sale Reconciliation To Cash Flow Deductions From Held For Sale LoansReceivableHeldForSaleReconciliationToCashFlowDeductionsFromHeldForSale	698400000	usd
	colb	Carrying Value Of Loans Sold Non Relationship Jumbo CarryingValueOfLoansSoldNonRelationshipJumbo	620600000	usd
CY2023Q3	us-gaap	Direct Financing Lease Interest Income DirectFinancingLeaseInterestIncome	4700000	usd
	us-gaap	Direct Financing Lease Interest Income DirectFinancingLeaseInterestIncome	14100000	usd
CY2022Q3	us-gaap	Direct Financing Lease Interest Income DirectFinancingLeaseInterestIncome	4400000	usd
	us-gaap	Direct Financing Lease Interest Income DirectFinancingLeaseInterestIncome	14300000	usd
	colb	Length Of Time Projected By Model LengthOfTimeProjectedByModel	P10Y
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	404603000	usd
CY2023Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	35082000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	28719000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	5594000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	23125000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	416560000	usd
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	19827000	usd
CY2023Q3	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	1655000	usd
CY2023Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	21482000	usd
CY2023Q3	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	438042000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	301135000	usd
	us-gaap	Financing Receivable Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	26492000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	156796000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	82466000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	14603000	usd
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	67863000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	416560000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	14221000	usd
	colb	Off Balance Sheet Credit Loss Liability Acquired During The Period OffBalanceSheetCreditLossLiabilityAcquiredDuringThePeriod	5767000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	1494000	usd
CY2023Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	21482000	usd
CY2023Q3	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	438042000	usd
CY2023Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	88400000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	261111000	usd
CY2022Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	28542000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	10392000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3804000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	6588000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	283065000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	12823000	usd
CY2022Q3	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-970000	usd
CY2022Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	11853000	usd
CY2022Q3	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	294918000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	248412000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	53025000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	29181000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10809000	usd
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	18372000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	283065000	usd
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	12767000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-914000	usd
CY2022Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	11853000	usd
CY2022Q3	colb	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	294918000	usd
	colb	Days Past Due On Leases And Equipment Finance DaysPastDueOnLeasesAndEquipmentFinance	P181D
	colb	Interest Income On Non Accrual Loans And Leases InterestIncomeOnNonAccrualLoansAndLeases	0	usd
	colb	Interest Income On Non Accrual Loans And Leases InterestIncomeOnNonAccrualLoansAndLeases	0	usd
CY2022Q3	colb	Interest Income On Non Accrual Loans And Leases InterestIncomeOnNonAccrualLoansAndLeases	0	usd
CY2023Q3	colb	Interest Income On Non Accrual Loans And Leases InterestIncomeOnNonAccrualLoansAndLeases	0	usd
CY2023Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	70394000	usd
CY2023Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	37170598000	usd
CY2023Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	70400000	usd
CY2023Q3	colb	Financing Receivable Allowance For Non Accrual Credit Losses FinancingReceivableAllowanceForNonAccrualCreditLosses	25900000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	30702000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	26155981000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	30700000	usd
CY2022Q4	colb	Financing Receivable Allowance For Non Accrual Credit Losses FinancingReceivableAllowanceForNonAccrualCreditLosses	17500000	usd
CY2022Q3	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	0	usd
CY2023Q3	colb	Financing Receivable Modified In Period To Total Financing Receivables Percentage FinancingReceivableModifiedInPeriodToTotalFinancingReceivablesPercentage	0.0005
	colb	Financing Receivable Modified In Period To Total Financing Receivables Percentage FinancingReceivableModifiedInPeriodToTotalFinancingReceivablesPercentage	0.0013
CY2023Q3	colb	Financing Receivable Modified In Period Nonaccrual Amount FinancingReceivableModifiedInPeriodNonaccrualAmount	619000	usd
	colb	Financing Receivable Modified In Period Nonaccrual Amount FinancingReceivableModifiedInPeriodNonaccrualAmount	1782000	usd
CY2023Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	2796594000	usd
CY2023Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	9063448000	usd
CY2023Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	8331544000	usd
CY2023Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	2798678000	usd
CY2023Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	2923571000	usd
CY2023Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	5745002000	usd
CY2023Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	5400376000	usd
CY2023Q3	colb	Financing Receivable Revolving To Non Revolving Loans Amortized Cost FinancingReceivableRevolvingToNonRevolvingLoansAmortizedCost	111385000	usd
CY2023Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	37170598000	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
CY2023Q3	us-gaap	Goodwill Goodwill	1000000000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	0	usd
CY2023Q3	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P10Y
	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	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
CY2023Q1	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	710230000	usd
CY2023Q1	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	710230000	usd
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	12660000	usd
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	12660000	usd
CY2023Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	764791000	usd
CY2023Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	62476000	usd
CY2023Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	702315000	usd
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	35553000	usd
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	35553000	usd
CY2023Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	764791000	usd
CY2023Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	98029000	usd
CY2023Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	666762000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29879000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29879000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	764791000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	127908000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	636883000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	33205000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	119431000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	105458000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	92545000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	79632000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	206612000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	636883000	usd
CY2023Q2	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	172929000	usd
CY2022Q2	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	179558000	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
CY2023Q3	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	1658000	usd
CY2022Q3	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	5194000	usd
	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	4427000	usd
	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	20397000	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	57454000	usd
	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	57454000	usd
	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	0	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-4801000	usd
CY2022Q3	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-4978000	usd
CY2023Q3	colb	Standby Letters Of Credit Expires Within One Year StandbyLettersOfCreditExpiresWithinOneYear	189200000	usd
	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-14479000	usd
	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-15286000	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	5308000	usd
CY2022Q3	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	16403000	usd
	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	129000	usd
	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	67451000	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	117640000	usd
CY2022Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	196177000	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	117640000	usd
CY2022Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	196177000	usd
CY2023Q3	colb	Balance Of Loans Serviced For Others BalanceOfLoansServicedForOthers	8240950000	usd
CY2022Q4	colb	Balance Of Loans Serviced For Others BalanceOfLoansServicedForOthers	13020189000	usd
CY2023Q3	colb	Mortgage Servicing Rights Percentage Of Serviced Loans MortgageServicingRightsPercentageOfServicedLoans	0.0143
CY2022Q4	colb	Mortgage Servicing Rights Percentage Of Serviced Loans MortgageServicingRightsPercentageOfServicedLoans	0.0142
CY2023Q3	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	8900000	usd
	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	27500000	usd
CY2022Q3	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	9500000	usd
	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	28200000	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	57500000	usd
CY2023Q3	colb	Residential Mortgage Loans Serviced For Others Disposal ResidentialMortgageLoansServicedForOthersDisposal	4400000000	usd
CY2023Q3	us-gaap	Other Borrowings OtherBorrowings	4000000000	usd
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	906200000	usd
CY2023Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	4000000000	usd
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	906200000	usd
CY2023Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	35000000	usd
CY2023Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	35000000	usd
CY2023Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0783
CY2022Q3	colb	Standby Letters Of Credit Financial Guaranteesrequiredtoperformon StandbyLettersOfCreditFinancialGuaranteesrequiredtoperformon	0	usd
	colb	Standby Letters Of Credit Financial Guaranteesrequiredtoperformon StandbyLettersOfCreditFinancialGuaranteesrequiredtoperformon	0	usd
CY2023Q3	colb	Standby Letters Of Credit Financial Guaranteesrequiredtoperformon StandbyLettersOfCreditFinancialGuaranteesrequiredtoperformon	0	usd
	colb	Standby Letters Of Credit Financial Guaranteesrequiredtoperformon StandbyLettersOfCreditFinancialGuaranteesrequiredtoperformon	0	usd
CY2023Q3	colb	Standby Letters Of Credit Expire Thereafter StandbyLettersOfCreditExpireThereafter	9300000	usd
CY2023Q3	colb	Mortgage Loans On Real Estate Repurchase Reserve Liability MortgageLoansOnRealEstateRepurchaseReserveLiability	200000	usd
CY2023Q3	colb	Gnma Loans Past Due By90 Days But Not Yet Repurchased GNMALoansPastDueBy90DaysButNotYetRepurchased	700000	usd
CY2023Q3	colb	Prior Bankruptcy Recoveries By Plaintiffs PriorBankruptcyRecoveriesByPlaintiffs	110000000	usd
CY2023Q3	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	4600000	usd
CY2023Q3	colb	Percentage Of Commercial Real Estate Portfolio Office Space PercentageOfCommercialRealEstatePortfolioOfficeSpace	0.17
CY2023Q3	colb	Percent Of Total Loan Portfolio Office Space PercentOfTotalLoanPortfolioOfficeSpace	0.08
CY2022Q3	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
CY2023Q3	colb	Counterparty Default Loss On Forward Contract CounterpartyDefaultLossOnForwardContract	0	usd
CY2023Q3	us-gaap	Collateralized Financings CollateralizedFinancings	4200000	usd
CY2023Q3	colb	Termination Value Of Derivatives In Net Liability Position TerminationValueOfDerivativesInNetLiabilityPosition	401500000	usd
CY2022Q4	colb	Termination Value Of Derivatives In Net Liability Position TerminationValueOfDerivativesInNetLiabilityPosition	270000000	usd
CY2023Q3	colb	Collateral Posting Clearing CollateralPostingClearing	82100000	usd
CY2022Q4	colb	Collateral Posting Clearing CollateralPostingClearing	89500000	usd
CY2023Q3	colb	Variation Margin Adjustment VariationMarginAdjustment	261700000	usd
CY2022Q4	colb	Variation Margin Adjustment VariationMarginAdjustment	209500000	usd
CY2023Q3	colb	Customer Swaps Offset By A Swap Executed On A Bilateral Basis With A Counterparty Bank CustomerSwapsOffsetByASwapExecutedOnABilateralBasisWithACounterpartyBank	228
CY2022Q4	colb	Customer Swaps Offset By A Swap Executed On A Bilateral Basis With A Counterparty Bank CustomerSwapsOffsetByASwapExecutedOnABilateralBasisWithACounterpartyBank	71
CY2023Q3	colb	Counterparty Bank Cash As Collateral On Bilateral Positions CounterpartyBankCashAsCollateralOnBilateralPositions	149700000	usd
CY2022Q4	colb	Counterparty Bank Cash As Collateral On Bilateral Positions CounterpartyBankCashAsCollateralOnBilateralPositions	51900000	usd
CY2023Q3	us-gaap	Derivative Assets DerivativeAssets	769000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	15444000	usd
CY2023Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	403821000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	271205000	usd
CY2023Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1642000	usd
CY2022Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-1287000	usd
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-5979000	usd
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	49294000	usd
CY2023Q3	us-gaap	Fair Value Liabilities Measured On Recurring Basis Subordinated Debt Obligations FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations	331545000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	135845000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	84040000	usd
	us-gaap	Net Income Loss NetIncomeLoss	255184000	usd
	us-gaap	Net Income Loss NetIncomeLoss	253788000	usd
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	208070000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	129319000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	190997000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	129262000	shares
CY2023Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	575000	shares
CY2022Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	414000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	549000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	440000	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	208645000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129733000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	191546000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129702000	shares
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.96
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2023Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	878000	shares
CY2022Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	749000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2023Q3	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	60313000	usd
CY2023Q3	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	257911000	usd
CY2023Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	117640000	usd
CY2023Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	9014257000	usd
CY2023Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	735366000	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
CY2023Q3	colb	Fair Value Portfolio Loans FairValuePortfolioLoans	257900000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-19700000	usd
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-8500000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-14600000	usd
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-6300000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-4000000	usd
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax	-31800000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-3000000	usd
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period After Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax	-23600000	usd
CY2023Q3	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	30982000	usd
CY2023Q3	colb	Fair Value Option Aggregate Unpaid Balance Loans And Long Term Receivables FairValueOptionAggregateUnpaidBalanceLoansAndLongTermReceivables	30673000	usd
CY2023Q3	us-gaap	Fair Value Option Aggregate Differences Loans And Long Term Receivables FairValueOptionAggregateDifferencesLoansAndLongTermReceivables	309000	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
CY2023Q3	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	257911000	usd
CY2023Q3	colb	Fair Value Loans Held As Assets Aggregate Unpaid Balance Loans And Long Term Receivables FairValueLoansHeldAsAssetsAggregateUnpaidBalanceLoansAndLongTermReceivables	322523000	usd
CY2023Q3	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	-64612000	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
CY2023Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	469800000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	88900000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	84400000	usd
	colb	Effective Tax Rate As A Percentage Of Pre Tax Income Loss EffectiveTaxRateAsAPercentageOfPreTaxIncomeLoss	0.258
	colb	Effective Tax Rate As A Percentage Of Pre Tax Income Loss EffectiveTaxRateAsAPercentageOfPreTaxIncomeLoss	0.249
CY2023Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q3	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
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0000887343-23-000307-index.html	Edgar Link	pending
0000887343-23-000307.txt	Edgar Link	pending
0000887343-23-000307-xbrl.zip	Edgar Link	pending
colb-20230930.htm	Edgar Link	pending
colb-20230930.xsd	Edgar Link	pending
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colb-20230930xex312.htm	Edgar Link	pending
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$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb

2023 Q4 Form 10-Q Financial Statement

#000088734323000307 Filed on November 03, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB COLUMBIA BANKING SYSTEM, INC. Stock $colb

2023 Q4 Form 10-Q Financial Statement

#000088734323000307 Filed on November 03, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb