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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Deposit account and treasury management fees | $ 7,788 | $ 8,980
Card revenue | 3,518 | 3,662
Financial services and trust revenue | 3,065 | 2,957
Revenue from contracts with customers | 14,371 | 15,599
Noninterest income, excluding revenue from contracts with customers | 6,836 | 6,097
Noninterest Income | $ 21,207 | $ 21,696

X
- Definition Income earned from bank card and credit card services including late, over limit, and annual fees. This item excludes interest income earned on credit card balances and transactions. Includes interchange fees earned from bank card and credit card transactions. Also includes ATM and other banking fees. + References No definition available. + Details
Name: | colb_Cardrevenue
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. + References No definition available. + Details
Name: | colb_Depositaccountandtreasurymanagementfees
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gross income from services rendered by the trust subsidiary, acting in any fiduciary capacity. Also include fees and commissions from the financial services department, including securities brokerage activities, investment advisory and management services. + References No definition available. + Details
Name: | colb_Financialservicesandtrustrevenue
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noninterest income, excluding revenue from contracts with customers + References No definition available. + Details
Name: | colb_Noninterestincomeexcludingrevenuefromcontractswithcustomers
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue from contracts with customers + References No definition available. + Details
Name: | colb_Revenuefromcontractswithcustomers
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
Name: | us-gaap_NoninterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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