Business Acquisition, Equity Interest Issued or Issuable, Share Exchange Ratio

No definition available.

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- Definition

Days past due of GNMA loans available for repurchase

+ References

No definition available.

+ Details

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- Definition

GNMA loans that have the unilateral right, but not the obligation, to repurchase that are past due 90 days or more and have been recorded as loans as part of the loan portfolio as if they had been repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Mortgage Loans on Real Estate, Repurchase Reserve Liability

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Standby Letters Of Credit Expire Thereafter

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Standby Letters Of Credit Expires Within One Year

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Standby Letters of Credit, Fees

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Standby Letters of Credit Drawings

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Termination Fee

+ References

No definition available.

+ Details

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Namespace Prefix:	umpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Period Type:	instant

- References

No definition available.

+ Details

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- 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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Details

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- Details

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Data Type:	na
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- Details

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- Details

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- Details

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- Details

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Commitments and Contingencies (Narrative) (Details) - USD ($)		12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Standby letters of credit, required to perform on financial guarantees		$ 0	$ 0
Standby letters of credit that expire within one year		102,800,000
Standby letters of credit that expire thereafter		6,200,000
Standby letters of credit fees		1,700,000	$ 1,600,000
Residential mortgage loan repurchase reserve liability		$ 420,000
Days past due of GNMA loans available for repurchase		90 days
GNMA Loans past due by 90 days, but not yet repurchased		$ 0
Expected
Concentration Risk [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Share Exchange Ratio	0.5958
Termination Fee	$ 145,000,000
Expected \| Umpqua Bank and Columbia Banking System Merger [Member]
Concentration Risk [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	62.00%
Columbia Banking System, Inc. [Member] \| Expected \| Umpqua Bank and Columbia Banking System Merger [Member]
Concentration Risk [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	38.00%
Product Concentration Risk \| Revenue Benchmark \| Real Estate Loans as Part of Loan portfolio
Concentration Risk [Line Items]
Concentration risk, percentage		76.00%	71.00%