XML 60 R53.htm IDEA: XBRL DOCUMENT
v3.25.3

Securities - Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity (Detail) $ in Thousands | Sep. 30, 2025 USD ($) Security | Dec. 31, 2024 USD ($) Security
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 169 | 53
Less than 12 months, Fair Value | $ 862,257 | $ 55,995
Less than 12 months,Unrealized Losses | $ (50,227) | $ (2,133)
12 months or more, Count | Security | 1,615 | 1,687
12 months or more, Fair Value | $ 3,505,608 | $ 4,189,802
12 months or more, Unrealized Losses | $ (497,550) | $ (639,876)
Total Count | Security | 1,784 | 1,740
Total Fair Value | $ 4,367,865 | $ 4,245,797
Total Unrealized Losses | $ (547,777) | $ (642,009)
U.S. Treasury [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 6 |
Less than 12 months, Fair Value | $ 30,638 |
Less than 12 months,Unrealized Losses | $ (115) |
Total Count | Security | 6 |
Total Fair Value | $ 30,638 |
Total Unrealized Losses | $ (115) |
U.S. Agencies [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
12 months or more, Count | Security |  | 10
12 months or more, Fair Value |  | $ 115,750
12 months or more, Unrealized Losses |  | $ (581)
Total Count | Security |  | 10
Total Fair Value |  | $ 115,750
Total Unrealized Losses |  | $ (581)
Mortgage-backed [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 12 | 6
Less than 12 months, Fair Value | $ 104,013 | $ 3,527
Less than 12 months,Unrealized Losses | $ (1,198) | $ (103)
12 months or more, Count | Security | 262 | 263
12 months or more, Fair Value | $ 2,037,057 | $ 2,101,125
12 months or more, Unrealized Losses | $ (322,126) | $ (418,379)
Total Count | Security | 274 | 269
Total Fair Value | $ 2,141,070 | $ 2,104,652
Total Unrealized Losses | $ (323,324) | $ (418,482)
State and political subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 151 | 47
Less than 12 months, Fair Value | $ 727,606 | $ 52,468
Less than 12 months,Unrealized Losses | $ (48,914) | $ (2,030)
12 months or more, Count | Security | 1,353 | 1,414
12 months or more, Fair Value | $ 1,468,551 | $ 1,972,927
12 months or more, Unrealized Losses | $ (175,424) | $ (220,916)
Total Count | Security | 1,504 | 1,461
Total Fair Value | $ 2,196,157 | $ 2,025,395
Total Unrealized Losses | $ (224,338) | $ (222,946)

X
- Definition Held to maturity securities continuous unrealized loss position 12 months or longer number of positions. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | umbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss position less than 12 months number of positions. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions
Namespace Prefix: | umbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss positions 12 months or longer accumulated loss. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | umbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss positions accumulated loss. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss
Namespace Prefix: | umbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss positions fair value. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue
Namespace Prefix: | umbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss positions less than 12 months accumulated loss. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss
Namespace Prefix: | umbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss positions less than twelve months fair value. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThanTwelveMonthsFairValue
Namespace Prefix: | umbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held to maturity securities continuous unrealized loss positions twelve months or longer fair value. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsTwelveMonthsOrLongerFairValue
Namespace Prefix: | umbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held to maturity securities unrealized loss position number of positions. + References No definition available. + Details
Name: | umbf_HeldToMaturitySecuritiesUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | umbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 + Details
Name: | us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |