XML 55 R45.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | $ 24,176 | $ 34,806
Total Loans | 9,521,385 | 9,427,660
Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 2,871 | 7,712
Total Loans | 4,088,484 | 4,062,313
Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 12,105 | 13,222
Total Loans | 3,436,351 | 3,597,968
Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 7,706 | 11,614
Total Loans | 815,985 | 779,627
Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 0 | 217
Total Loans | 326,569 | 268,663
One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 1,491 | 2,001
Total Loans | 823,877 | 683,570
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 3 | 40
Total Loans | 30,119 | 35,519
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 9,489,455 | 9,364,697
Financial Asset, Not Past Due | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 4,081,036 | 4,037,309
Financial Asset, Not Past Due | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 3,421,381 | 3,578,905
Financial Asset, Not Past Due | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 808,279 | 767,102
Financial Asset, Not Past Due | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 326,569 | 268,304
Financial Asset, Not Past Due | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 822,170 | 677,627
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 30,020 | 35,450
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 5,243 | 21,792
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 3,803 | 17,292
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 1,334 | 1,282
Financial Asset, 30 to 59 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 911
Financial Asset, 30 to 59 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, 30 to 59 Days Past Due [Member] | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 10 | 2,283
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 96 | 24
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 2,511 | 6,365
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 774 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 1,531 | 4,559
Financial Asset, 60 to 89 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 142
Financial Asset, 60 to 89 Days Past Due [Member] | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 206 | 1,659
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 5
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 0
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 7,754 | 28,157
Financial Asset, Past Due | Commercial Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 4,577 | 17,292
Financial Asset, Past Due | Commercial Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 2,865 | 5,841
Financial Asset, Past Due | Agriculture [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 911
Financial Asset, Past Due | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 0 | 142
Financial Asset, Past Due | One-to-Four Family Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | 216 | 3,942
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans | $ 96 | $ 29

X
- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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=us-gaap_ConstructionMember
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: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |