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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $) In Thousands, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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| Financing Receivable, Recorded Investment [Line Items] |
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| Less: Unearned income on loans |
$ (53,867)us-gaap_LoansAndLeasesReceivableDeferredIncome |
$ (59,374)us-gaap_LoansAndLeasesReceivableDeferredIncome |
|
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| Recorded Investment |
5,450,895us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |
5,445,378us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |
|
|
| Allowance for loan losses |
(70,234)us-gaap_LoansAndLeasesReceivableAllowance |
(69,569)us-gaap_LoansAndLeasesReceivableAllowance |
(70,571)us-gaap_LoansAndLeasesReceivableAllowance |
(72,454)us-gaap_LoansAndLeasesReceivableAllowance |
| Loans, net |
5,380,661us-gaap_LoansAndLeasesReceivableNetReportedAmount |
5,375,809us-gaap_LoansAndLeasesReceivableNetReportedAmount |
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| Loans held for sale |
3,545us-gaap_LoansReceivableHeldForSaleNet |
1,116us-gaap_LoansReceivableHeldForSaleNet |
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| Loans, Excluding Purchased Credit Impaired Loans [Member] |
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|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
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| Less: Unearned income on loans |
(53,867)us-gaap_LoansAndLeasesReceivableDeferredIncome / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
(59,374)us-gaap_LoansAndLeasesReceivableDeferredIncome / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
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| Recorded Investment |
5,231,056us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
5,214,794us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
|
| Allowance for loan losses |
(53,703)us-gaap_LoansAndLeasesReceivableAllowance / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
(53,233)us-gaap_LoansAndLeasesReceivableAllowance / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Loans, net |
5,177,353us-gaap_LoansAndLeasesReceivableNetReportedAmount / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
5,161,561us-gaap_LoansAndLeasesReceivableNetReportedAmount / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
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| Loans held for sale |
3,545us-gaap_LoansReceivableHeldForSaleNet / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
1,116us-gaap_LoansReceivableHeldForSaleNet / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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|
| Loans and Leases Receivable, Gross |
5,231,056us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
5,214,794us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Purchased Credit Impaired Loans [Member] |
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|
|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
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| Less: Unearned income on loans |
0us-gaap_LoansAndLeasesReceivableDeferredIncome / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
0us-gaap_LoansAndLeasesReceivableDeferredIncome / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Recorded Investment |
219,839us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
230,584us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Allowance for loan losses |
(16,531)us-gaap_LoansAndLeasesReceivableAllowance / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
(16,336)us-gaap_LoansAndLeasesReceivableAllowance / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Loans, net |
203,308us-gaap_LoansAndLeasesReceivableNetReportedAmount / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
214,248us-gaap_LoansAndLeasesReceivableNetReportedAmount / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Loans held for sale |
0us-gaap_LoansReceivableHeldForSaleNet / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
0us-gaap_LoansReceivableHeldForSaleNet / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Loans and Leases Receivable, Gross |
243,111us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
256,468us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Acquisition Accounting Valuation Discount on Covered Loans |
23,272colb_AcquisitionAccountingValuationDiscountOnCoveredLoans / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
25,884colb_AcquisitionAccountingValuationDiscountOnCoveredLoans / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member] |
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|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
|
| Loans and Leases Receivable, Gross |
2,501us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialandMultifamilyResidentialConstructionDomain / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
2,588us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialandMultifamilyResidentialConstructionDomain / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| One-to-Four Family Residential [Member] |
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|
|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
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| Loans and Leases Receivable, Gross, Consumer, Mortgage |
200,340us-gaap_LoansAndLeasesReceivableConsumerMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
202,564us-gaap_LoansAndLeasesReceivableConsumerMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
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| Loans and Leases Receivable, Gross, Consumer, Construction |
127,814us-gaap_LoansAndLeasesReceivableConsumerConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
120,887us-gaap_LoansAndLeasesReceivableConsumerConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
|
|
| Allowance for loan losses |
(1,364)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
(2,281)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
(1,194)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
(1,252)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember |
| One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |
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|
|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
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| Loans and Leases Receivable, Gross, Consumer, Mortgage |
173,739us-gaap_LoansAndLeasesReceivableConsumerMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
175,571us-gaap_LoansAndLeasesReceivableConsumerMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
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| Loans and Leases Receivable, Gross, Consumer, Construction |
124,017us-gaap_LoansAndLeasesReceivableConsumerConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
116,866us-gaap_LoansAndLeasesReceivableConsumerConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
|
| Loans and Leases Receivable, Gross |
170,307us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
171,764us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member] |
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|
|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
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| Loans and Leases Receivable, Gross, Consumer, Mortgage |
26,601us-gaap_LoansAndLeasesReceivableConsumerMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
26,993us-gaap_LoansAndLeasesReceivableConsumerMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Loans and Leases Receivable, Gross, Consumer, Construction |
3,797us-gaap_LoansAndLeasesReceivableConsumerConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
4,021us-gaap_LoansAndLeasesReceivableConsumerConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Loans and Leases Receivable, Gross |
31,127us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
31,981us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OneToFourFamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Commercial and Multifamily Residential [Member] |
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|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
|
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| Loans Receivable, Gross, Commercial, Mortgage |
2,492,684us-gaap_LoansReceivableCommercialMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember |
2,492,310us-gaap_LoansReceivableCommercialMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember |
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| Loans Receivable, Gross, Commercial, Construction |
122,118us-gaap_LoansReceivableCommercialConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember |
136,764us-gaap_LoansReceivableCommercialConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember |
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| Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |
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|
|
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| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
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| Loans Receivable, Gross, Commercial, Mortgage |
2,374,454us-gaap_LoansReceivableCommercialMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
2,363,541us-gaap_LoansReceivableCommercialMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Loans Receivable, Gross, Commercial, Construction |
119,880us-gaap_LoansReceivableCommercialConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
134,443us-gaap_LoansReceivableCommercialConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member] |
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|
|
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| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
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| Loans Receivable, Gross, Commercial, Mortgage |
118,230us-gaap_LoansReceivableCommercialMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
128,769us-gaap_LoansReceivableCommercialMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Loans Receivable, Gross, Commercial, Construction |
2,238us-gaap_LoansReceivableCommercialConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
2,321us-gaap_LoansReceivableCommercialConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Loans and Leases Receivable, Gross |
127,952us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
140,398us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_CommercialAndMultifamilyResidentialMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Commercial Portfolio Segment [Member] |
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| Financing Receivable, Recorded Investment [Line Items] |
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| Loans Receivable, Gross, Commercial and Industrial |
2,186,208us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
2,164,070us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
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| Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |
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|
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| Financing Receivable, Recorded Investment [Line Items] |
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|
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| Loans Receivable, Gross, Commercial and Industrial |
2,139,873us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
2,119,565us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member] |
|
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|
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| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
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| Loans Receivable, Gross, Commercial and Industrial |
46,335us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
44,505us-gaap_LoansReceivableCommercialAndIndustrial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Loans and Leases Receivable, Gross |
52,115us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
50,334us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Real Estate Portfolio Segment [Member] |
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| Financing Receivable, Recorded Investment [Line Items] |
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|
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| Loans Receivable Real Estate Mortgage |
2,693,024colb_LoansReceivableRealEstateMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember |
2,694,874colb_LoansReceivableRealEstateMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember |
|
|
| Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |
|
|
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
|
| Loans Receivable Real Estate Mortgage |
2,548,193colb_LoansReceivableRealEstateMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
2,539,112colb_LoansReceivableRealEstateMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
|
| Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member] |
|
|
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
|
| Loans Receivable Real Estate Mortgage |
144,831colb_LoansReceivableRealEstateMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
155,762colb_LoansReceivableRealEstateMortgage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| Loans and Leases Receivable, Gross |
159,079us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
172,379us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstatePortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
|
|
| One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member] |
|
|
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
|
| Loans and Leases Receivable, Gross |
4,026us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OnetoFourFamilyResidentialConstructionDomain / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
4,353us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_OnetoFourFamilyResidentialConstructionDomain / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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|
| Real Estate Construction Portfolio Segment [Member] |
|
|
|
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| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
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| Loans Receivable Real Estate Construction |
249,932colb_LoansReceivableRealEstateConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember |
257,651colb_LoansReceivableRealEstateConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember |
|
|
| Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |
|
|
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
|
| Loans Receivable Real Estate Construction |
243,897colb_LoansReceivableRealEstateConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
251,309colb_LoansReceivableRealEstateConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
|
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| Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member] |
|
|
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
|
|
| Loans Receivable Real Estate Construction |
6,035colb_LoansReceivableRealEstateConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
6,342colb_LoansReceivableRealEstateConstruction / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Loans and Leases Receivable, Gross |
6,527us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
6,941us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = colb_RealEstateConstructionPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Consumer Portfolio Segment [Member] |
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| Financing Receivable, Recorded Investment [Line Items] |
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| Loans and Leases Receivable, Gross, Consumer |
375,598us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
388,157us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
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| Allowance for loan losses |
(2,835)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
(3,180)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
(2,637)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
(2,547)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
| Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |
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| Financing Receivable, Recorded Investment [Line Items] |
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| Loans and Leases Receivable, Gross, Consumer |
352,960us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
364,182us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Loans and Leases Receivable, Gross |
336,158us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
345,032us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_LoansExcludingPurchasedCreditImpairedLoansMember |
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| Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member] |
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| Financing Receivable, Recorded Investment [Line Items] |
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| Loans and Leases Receivable, Gross, Consumer |
22,638us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
23,975us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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| Loans and Leases Receivable, Gross |
$ 25,390us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
$ 26,814us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / colb_LoansByMajorCategoryAxis = colb_PurchasedCreditImpairedLoansMember |
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