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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Mar. 28, 2022	Mar. 31, 2021	Jun. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Disposition of goodwill		$ 6,300
Unamortized customer relationship intangibles		$ 1,900
Loan acquired	$ 43,000
Deposit acquired	226,800
Recognition of goodwill	7,700		$ 7,707
Core deposit intangible asset	$ 2,300

X

- Definition

Core deposit intangible asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	umbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deposit acquired.

+ References

No definition available.

+ Details

Name:	umbf_DepositAcquired
Namespace Prefix:	umbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Loan acquired during the period.

+ References

No definition available.

+ Details

Name:	umbf_LoanAcquiredDuringPeriod
Namespace Prefix:	umbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Unamortized customer relationship intangibles.

+ References

No definition available.

+ Details

Name:	umbf_UnamortizedCustomerRelationshipIntangibles
Namespace Prefix:	umbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 55
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 55
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration