XML 133 R117.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Interest Bearing Deposits (Narrative) (Details) $ in Thousands | Dec. 31, 2023 USD ($)
--- | ---
Distribution of Assets, Liabilities and Stockholders' Equity [Line Items] |
Time Deposit Maturities, Year One | $ 6,049,079
Weighted Average Rate on Time Deposits | 4.55%
Time Deposits Including Brokered [Member] |
Distribution of Assets, Liabilities and Stockholders' Equity [Line Items] |
Time Deposit Maturities, Year One | $ 6,000,000
Brokered Time Deposits [Member] |
Distribution of Assets, Liabilities and Stockholders' Equity [Line Items] |
Time Deposit Maturities, Year One | $ 2,600,000
Weighted Average Rate on Time Deposits | 5.53%
Time Deposits Excluding Brokered [Member] |
Distribution of Assets, Liabilities and Stockholders' Equity [Line Items] |
Weighted Average Rate on Time Deposits | 3.93%

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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph a -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph b -Subparagraph (1) -Publisher SEC Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph b -Subparagraph (2) -Publisher SEC Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph b -Subparagraph (3) -Publisher SEC + Details
Name: | srt_DistributionOfAssetsLiabilitiesAndStockholdersEquityLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of time deposit maturing in next fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesYearOne
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average interest rate for domestic time deposit liabilities. + References No definition available. + Details
Name: | us-gaap_WeightedAverageRateDomesticDepositTimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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

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