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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deposit account and treasury management fees									$ 35,695	$ 36,072	$ 30,381
Card revenue									15,198	19,719	25,627
Financial services and trust revenue									12,799	12,135	11,478
Revenue from contracts with customers									63,692	67,926
Noninterest income, excluding revenue from contracts with customers									33,489	20,330
Noninterest income	$ 21,807	$ 28,030	$ 25,648	$ 21,696	$ 20,402	$ 21,019	$ 23,692	$ 23,143	$ 97,181	$ 88,256	$ 109,642

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

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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

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X

- Definition

Noninterest income, excluding revenue from contracts with customers

+ References

No definition available.

+ Details

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Namespace Prefix:	colb_
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X

- Definition

Revenue from contracts with customers

+ References

No definition available.

+ Details

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Namespace Prefix:	colb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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

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Balance Type:	na
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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

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