XML 48 R37.htm IDEA: XBRL DOCUMENT v3.25.1

Loans and Leases (Schedule Of Major Types Of Loans And Leases) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	$ 37,616,101	$ 37,680,901
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	19,637,032	19,567,672
Commercial real estate | Non-owner occupied term, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	6,179,261	6,278,154
Commercial real estate | Owner occupied term, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	5,303,424	5,270,294
Commercial real estate | Multifamily, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	5,831,266	5,804,364
Commercial real estate | Construction & development, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	2,070,732	1,983,213
Commercial real estate | Residential development, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	252,349	231,647
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	9,887,854	9,968,096
Commercial | Term, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	5,490,189	5,537,618
Commercial | Lines of credit & other, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	2,753,613	2,769,643
Commercial | Leases & equipment finance, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	1,644,052	1,660,835
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	7,917,488	7,965,005
Residential | Mortgage, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	5,878,427	5,933,352
Residential | Home equity loans & lines, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	2,039,061	2,031,653
Consumer & other, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	$ 173,727	$ 180,128

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialRealEstateNonownerOccupiedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialRealEstateOwnerOccupiedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialRealEstateConstructionAndDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialRealEstateResidentialDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_TermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_LineOfCreditAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialLeasesandEquipmentFinanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: