XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.21.2

Securities - Schedule of Other Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Other Securities [Line Items] |  |
Other securities | $ 274,645 | $ 296,053
FRB and FHLB stock [Member] |  |
Schedule of Other Securities [Line Items] |  |
Other securities | 36,222 | 33,222
Equity Securities With Readily Determinable Fair Values [Member] |  |
Schedule of Other Securities [Line Items] |  |
Other securities | 66,316 | 134,197
Equity Securities Without Readily Determinable Fair Values [Member] |  |
Schedule of Other Securities [Line Items] |  |
Other securities | $ 172,107 | $ 128,634

X
- Definition Schedule of Other Securities [Line Items]. + References No definition available. + Details
Name: | umbf_ScheduleOfOtherSecuritiesLineItems
Namespace Prefix: | umbf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=umbf_FederalReserveBankAndFederalHomeLoanBankStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=umbf_EquitySecuritiesWithReadilyDeterminableFairValuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=umbf_EquitySecuritiesWithoutReadilyDeterminableFairValuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |