XML 80 R72.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | $ 33,060 |
Unpaid Principal Balance Nonaccrual Loans | 45,209 | $ 65,358
Recorded Investment Nonaccrual Loans |  | 54,842
Consumer [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 2,018 |
Unpaid Principal Balance Nonaccrual Loans | 2,355 | 3,149
Recorded Investment Nonaccrual Loans |  | 2,949
Commercial business: Secured loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 26,615 |
Unpaid Principal Balance Nonaccrual Loans | 38,278 | 45,072
Recorded Investment Nonaccrual Loans |  | 35,504
Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 359 |
Unpaid Principal Balance Nonaccrual Loans | 360 | 9
Recorded Investment Nonaccrual Loans |  | 9
Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 591 |
Unpaid Principal Balance Nonaccrual Loans | 632 | 1,178
Recorded Investment Nonaccrual Loans |  | 1,158
Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 1,985 |
Unpaid Principal Balance Nonaccrual Loans | 1,994 | 2,270
Recorded Investment Nonaccrual Loans |  | 2,261
Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 205 |
Unpaid Principal Balance Nonaccrual Loans | 206 | 3,062
Recorded Investment Nonaccrual Loans |  | 2,721
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 1,287 |
Unpaid Principal Balance Nonaccrual Loans | 1,325 | 10,300
Recorded Investment Nonaccrual Loans |  | 9,922
Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 0 |
Unpaid Principal Balance Nonaccrual Loans | 0 | 318
Recorded Investment Nonaccrual Loans |  | 318
Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 0 |
Unpaid Principal Balance Nonaccrual Loans | 59 | 0
Recorded Investment Nonaccrual Loans |  | 0
Loans, Excluding Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 33,060 | 54,842
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 2,018 | 2,949
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 26,615 | 35,504
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 359 | 9
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 591 | 1,158
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 1,985 | 2,261
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 205 | 2,721
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 1,287 | 9,922
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 0 | 318
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 0 | 0
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | 0 | 0
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, Nonaccrual | $ 0 | $ 0

X
- Definition Financing Receivable, Recorded Investment, Gross, Nonaccrual Status + References No definition available. + Details
Name: | colb_FinancingReceivableRecordedInvestmentGrossNonaccrualStatus
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable Unpaid Principal Balance Nonaccrual Status. + References No definition available. + Details
Name: | colb_FinancingReceivableUnpaidPrincipalBalanceNonaccrualStatus
Namespace Prefix: | colb_
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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
- 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_IncomePropertyMultifamilyMember
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: | 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: |