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Regulatory Matters - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Regulatory Matters [Line Items]
Average reserve balances to be maintained by subsidiary banks		$ 2,036,744,000	$ 1,184,007,000
Average reserve balances required by subsidiary banks		$ 0	$ 0
Retained net profits available for distribution to United Bankshares, Inc. by its banking subsidiaries as dividends	$ 339,113,000
Maximum loan to parent company by subsidiaries as percentage it's of capital and surplus		10.00%
Maximum amount of loan to parent company by subsidiaries		$ 425,053,000

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- Definition

Average reserve balances required by subsidiary banks.

+ References

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- Definition

Average reserve balances to be maintained by subsidiary banks.

+ References

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- Definition

Maximum amount of loan to parent company by subsidiaries.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Maximum loan to parent company by subsidiaries as percentage of capital and surplus.

+ References

No definition available.

+ Details

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- Definition

Regulatory Matters [Line Items]

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- Definition

This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

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