XML 129 R73.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | $ 33,060 |
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 2,018 |
Commercial business: Secured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 26,615 |
Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 359 |
Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 591 |
Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 1,985 |
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 1,287 |
Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 0 |
Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 0 |
Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans | 205 |
Loans, Excluding Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 8,609,241 | $ 8,218,651
Total Past Due | 23,648 | 28,258
Nonaccrual Loans | 33,060 | 54,842
Financing Receivable, after Allowance for Credit Loss | 8,665,949 | 8,301,751
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 88,389 | 194,912
Total Past Due | 0 | 0
Nonaccrual Loans | 0 | 0
Financing Receivable, after Allowance for Credit Loss | 88,389 | 194,912
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 290,174 | 314,008
Total Past Due | 379 | 1,258
Nonaccrual Loans | 2,018 | 2,949
Financing Receivable, after Allowance for Credit Loss | 292,571 | 318,215
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 3,422,313 | 3,267,709
Total Past Due | 12,719 | 9,488
Nonaccrual Loans | 26,615 | 35,504
Financing Receivable, after Allowance for Credit Loss | 3,461,647 | 3,312,701
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 128,852 | 111,868
Total Past Due | 472 | 240
Nonaccrual Loans | 359 | 9
Financing Receivable, after Allowance for Credit Loss | 129,683 | 112,117
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 261,886 | 233,941
Total Past Due | 2,418 | 927
Nonaccrual Loans | 591 | 1,158
Financing Receivable, after Allowance for Credit Loss | 264,895 | 236,026
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 300,580 | 283,416
Total Past Due | 625 | 0
Nonaccrual Loans | 1,985 | 2,261
Financing Receivable, after Allowance for Credit Loss | 303,190 | 285,677
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 1,795,771 | 1,606,085
Total Past Due | 4,287 | 1,744
Nonaccrual Loans | 1,287 | 9,922
Financing Receivable, after Allowance for Credit Loss | 1,801,345 | 1,617,751
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 1,364 | 4,099
Total Past Due | 0 | 0
Nonaccrual Loans | 0 | 318
Financing Receivable, after Allowance for Credit Loss | 1,364 | 4,417
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 189,350 | 212,303
Total Past Due | 951 | 93
Nonaccrual Loans | 0 | 0
Financing Receivable, after Allowance for Credit Loss | 190,301 | 212,396
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 2,057,359 | 1,910,505
Total Past Due | 1,797 | 7,250
Nonaccrual Loans | 205 | 2,721
Financing Receivable, after Allowance for Credit Loss | 2,059,361 | 1,920,476
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 73,203 | 79,805
Total Past Due | 0 | 7,258
Nonaccrual Loans | 0 | 0
Financing Receivable, after Allowance for Credit Loss | 73,203 | 87,063
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 18,182 | 21,959
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 284 | 1,057
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,684 | 5,864
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 392 | 240
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,162 | 694
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 625 | 0
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,287 | 1,744
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 951 | 93
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,797 | 5,009
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 7,258
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,466 | 6,299
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 95 | 201
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,035 | 3,624
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 80 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 256 | 233
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 2,241
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 | $ 0

X
- Definition Amount of financing receivable not past due. + References Reference 1: 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=118955255&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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=118936363&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=119407570&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable past due. + References Reference 1: 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=118955255&loc=SL82922355-210448 Reference 2: 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=119407570&loc=SL82919253-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
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, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: 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=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

X
- Details
Name: | colb_LoansByMajorCategoryAxis=colb_LoansExcludingPurchasedCreditImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_OwnerOccupiedConstructionMember
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: |