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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income $ (59,374)us-gaap_LoansAndLeasesReceivableDeferredIncome $ (68,282)us-gaap_LoansAndLeasesReceivableDeferredIncome    
Total loans, net of unearned income 5,445,378us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1] 4,517,296us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1]    
Less: Allowance for loan and lease losses (69,569)us-gaap_LoansAndLeasesReceivableAllowance (72,454)us-gaap_LoansAndLeasesReceivableAllowance (82,300)us-gaap_LoansAndLeasesReceivableAllowance (57,985)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 5,375,809us-gaap_LoansAndLeasesReceivableNetReportedAmount 4,444,842us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Loans held for sale 1,116us-gaap_LoansReceivableHeldForSaleNet 735us-gaap_LoansReceivableHeldForSaleNet    
One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 202,564us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		 142,260us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		    
Real Estate Construction 120,887us-gaap_LoansAndLeasesReceivableConsumerConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		 67,468us-gaap_LoansAndLeasesReceivableConsumerConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		    
Less: Allowance for loan and lease losses (2,281)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		 (1,252)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		 (694)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember		 (654)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 2,492,310us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember		 2,234,266us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember		    
Real Estate Construction 136,764us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember		 131,763us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember		    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 2,164,070us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,622,724us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 2,694,874colb_LoansReceivableRealEstateMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstatePortfolioSegmentMember		 2,376,526colb_LoansReceivableRealEstateMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstatePortfolioSegmentMember		    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 257,651colb_LoansReceivableRealEstateConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstateConstructionPortfolioSegmentMember		 199,231colb_LoansReceivableRealEstateConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstateConstructionPortfolioSegmentMember		    
Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Consumer 388,157us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 387,097us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		    
Less: Allowance for loan and lease losses (3,180)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 (2,547)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 (2,437)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 (2,719)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income (59,374)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 (68,282)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Total loans, net of unearned income 5,214,794us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 4,219,451us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Less: Allowance for loan and lease losses (53,233)us-gaap_LoansAndLeasesReceivableAllowance
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 (52,280)us-gaap_LoansAndLeasesReceivableAllowance
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, net 5,161,561us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 4,167,171us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans held for sale 1,116us-gaap_LoansReceivableHeldForSaleNet
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 735us-gaap_LoansReceivableHeldForSaleNet
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, Excluding Purchased Credit Impaired Loans [Member] | One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 175,571us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 108,317us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Real Estate Construction 116,866us-gaap_LoansAndLeasesReceivableConsumerConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 54,155us-gaap_LoansAndLeasesReceivableConsumerConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 2,363,541us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 2,080,075us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Real Estate Construction 134,443us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 126,390us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 2,119,565us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 1,561,782us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate   2,188,392colb_LoansReceivableRealEstateMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstatePortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 251,309colb_LoansReceivableRealEstateConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstateConstructionPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 180,545colb_LoansReceivableRealEstateConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstateConstructionPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Consumer 364,182us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		 357,014us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_LoansExcludingPurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income 0us-gaap_LoansAndLeasesReceivableDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 0us-gaap_LoansAndLeasesReceivableDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Total loans, net of unearned income 230,584us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 297,845us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Less: Allowance for loan and lease losses (16,336)us-gaap_LoansAndLeasesReceivableAllowance
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 (20,174)us-gaap_LoansAndLeasesReceivableAllowance
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Loans, net 214,248us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 277,671us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Loans held for sale 0us-gaap_LoansReceivableHeldForSaleNet
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 0us-gaap_LoansReceivableHeldForSaleNet
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member] | One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 26,993us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 33,943us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Real Estate Construction 4,021us-gaap_LoansAndLeasesReceivableConsumerConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 13,313us-gaap_LoansAndLeasesReceivableConsumerConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_OneToFourFamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 128,769us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 154,191us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Real Estate Construction 2,321us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 5,373us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_CommercialAndMultifamilyResidentialMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 44,505us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 60,942us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate   188,134colb_LoansReceivableRealEstateMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstatePortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 6,342colb_LoansReceivableRealEstateConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstateConstructionPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 18,686colb_LoansReceivableRealEstateConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= colb_RealEstateConstructionPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
Purchased Credit Impaired Loans [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Consumer $ 23,975us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		 $ 30,083us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ colb_LoansByMajorCategoryAxis
= colb_PurchasedCreditImpairedLoansMember		    
[1] (1) Reclassified to conform to the current period’s presentation. The reclassification was limited to removing the separate line items for covered loans and including the prior period balances in the line items for loans, net of unearned income and allowance for loan and lease losses.