XML 86 R77.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Fair Value Accounting and Measurement (IRL Quantitative Information About Level 3 Fair Value Measurements) (Details) $ in Thousands | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($)
--- | --- | --- | ---
Measurement input pull through rate member | Valuation technique internal pricing model member | Interest Rate Lock Commitments Contracts | Minimum [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset, Measurement Input | 0.8084 |  | 0.7776
Measurement input pull through rate member | Valuation technique internal pricing model member | Interest Rate Lock Commitments Contracts | Maximum [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset, Measurement Input | 1.0000 |  | 1.0000
Measurement input pull through rate member | Valuation technique internal pricing model member | Interest Rate Lock Commitments Contracts | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset, Measurement Input | 0.9519 |  | 0.9062
Fair Value, Recurring [Member] |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset | $ 43,574 | $ 24,257 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset | $ 0 | 0 |
Fair Value, Recurring [Member] | Interest Rate Lock Commitments Contracts |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset |  | 356 | $ 482
Fair Value, Recurring [Member] | Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Measurements Inputs and Valuation Techniques |  |  |
Interest rate derivative asset |  | $ 356 |

X
- Definition Interest rate derivative asset, measurement input + References No definition available. + Details
Name: | colb_InterestRateDerivativeAssetMeasurementInput
Namespace Prefix: | colb_
Data Type: | xbrli:pureItemType
Balance Type: | na
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
Name: | us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=colb_MeasurementInputPullThroughRateMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=colb_ValuationTechniqueInternalPricingModelMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |