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Deposits - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deposits [Abstract] |  |
Noninterest-bearing deposits held for sale | $ 259,360 |
Interest-bearing deposits held for sale | 325,696 |
Overdrafts Reclassified as Loan Balances | 1,600 | $ 2,400
Time deposits held for sale | $ 23,900 |

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- Definition Interest-bearing deposits held for sale + References No definition available. + Details
Name: | colb_InterestBearingDepositsHeldForSale
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Noninterest-bearing deposits held for sale + References No definition available. + Details
Name: | colb_NoninterestBearingDepositsHeldForSale
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Time deposits held for sale + References No definition available. + Details
Name: | colb_TimeDepositsHeldForSale
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
Name: | us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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