XML 91 R78.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Loans Loans (Analysis of Troubled Debt Restructurings) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Modifications | Dec. 31, 2020 USD ($) Modifications | Dec. 31, 2019 USD ($) Modifications
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
TDR Modifications, Number of Contracts | Modifications | 16 | 19 | 24
Pre-Modification Outstanding Recorded Investment | $ 3,966 | $ 7,566 | $ 7,348
Post-Modification Outstanding Recorded Investment | $ 3,966 | $ 7,566 | $ 7,348
Commercial Real Estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
TDR Modifications, Number of Contracts | Modifications | 1 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ 628 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 628 | $ 0 | $ 0
Commercial Business |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
TDR Modifications, Number of Contracts | Modifications | 11 | 11 | 10
Pre-Modification Outstanding Recorded Investment | $ 2,600 | $ 3,257 | $ 6,560
Post-Modification Outstanding Recorded Investment | $ 2,600 | $ 3,257 | $ 6,560
Agriculture |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
TDR Modifications, Number of Contracts | Modifications | 1 | 2 | 0
Pre-Modification Outstanding Recorded Investment | $ 583 | $ 3,495 | $ 0
Post-Modification Outstanding Recorded Investment | $ 583 | $ 3,495 | $ 0
Real estate: One-to-four family residential |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
TDR Modifications, Number of Contracts | Modifications | 3 | 6 | 13
Pre-Modification Outstanding Recorded Investment | $ 155 | $ 814 | $ 787
Post-Modification Outstanding Recorded Investment | $ 155 | $ 814 | $ 787
Consumer Loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
TDR Modifications, Number of Contracts | Modifications | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 1

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 No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_AgricultureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_OneToFourFamilyResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |