XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.25.2

Investment Securities (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Investment Securities [Abstract] |
Summary Investment Holdings | Investment securities consisted of the following at June 30, 2025 and December 31, 2024.
(In thousands) | June 30, 2025 | December 31, 2024
Available for sale debt securities | $ | 8,915,779 |  | $ | 9,136,853 |
Trading debt securities | 46,630 |  | 38,034 |
Equity securities: |  |
Readily determinable fair value | 45,098 |  | 48,359 |
No readily determinable fair value | 9,413 |  | 9,083 |
Other: |  |
Federal Reserve Bank stock | 35,736 |  | 35,545 |
Federal Home Loan Bank stock | 10,100 |  | 10,120 |
Private equity investments | 174,070 |  | 184,386 |
Total investment securities (1) | $ | 9,236,826 |  | $ | 9,462,380 |
(1)Accrued interest receivable totaled $36.1 million and $35.0 million at June 30, 2025 and December 31, 2024, respectively, and was included within other assets on the consolidated balance sheets.
Equity Securities without Readily Determinable Fair Value | Changes in equity investments with no readily determinable fair value for each period were as follows:
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30
(In thousands) |  | 2024 |  |  | 2024
Balance at beginning of period |  | $ | 6,988 |  |  |  | $ | 6,978 |
Observable upward price adjustments |  | 178,227 |  |  |  | 178,227 |
Observable downward price adjustments |  | — |  |  |  | — |
Impairment charges |  | — |  |  |  | — |
Sales of securities and other activity |  | (119,435) |  |  |  | (119,425) |
Balance at end of period |  | $ | 65,780 |  |  |  | $ | 65,780 |
Gain (Loss) on Securities | Net gains and losses for the Company's equity securities portfolio for each period were as follows:
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30
(In thousands) |  | 2024 |  |  | 2024
Net gains (losses) recognized during the period on equity securities |  | $ | 178,164 |  |  |  | $ | 178,306 |
Less: Net (gains) losses recognized during the period on equity securities sold during the period |  | (119,987) |  |  |  | (119,987) |
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date |  | $ | 58,177 |  |  |  | $ | 58,319 |
Summary Of Available For Sale Investment Securities By Maturity Groupings | A summary of the available for sale debt securities by maturity groupings as of June 30, 2025 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as FHLMC, FNMA, and Government National Mortgage Association (GNMA), in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral.
(In thousands) | Amortized Cost | Fair Value
U.S. government and federal agency obligations: |  |
Within 1 year | $ | 439,321 |  | $ | 439,782 |
After 1 but within 5 years | 1,429,778 |  | 1,437,921 |
After 5 but within 10 years | 717,757 |  | 720,034 |
Total U.S. government and federal agency obligations | 2,586,856 |  | 2,597,737 |
Government-sponsored enterprise obligations: |  |
After 5 but within 10 years | 35,212 |  | 30,195 |
After 10 years | 19,820 |  | 13,953 |
Total government-sponsored enterprise obligations | 55,032 |  | 44,148 |
State and municipal obligations: |  |
Within 1 year | 70,837 |  | 70,298 |
After 1 but within 5 years | 416,047 |  | 393,723 |
After 5 but within 10 years | 176,358 |  | 155,555 |
After 10 years | 111,498 |  | 95,382 |
Total state and municipal obligations | 774,740 |  | 714,958 |
Mortgage and asset-backed securities: |  |
Agency mortgage-backed securities | 3,991,521 |  | 3,356,039 |
Non-agency mortgage-backed securities | 539,853 |  | 499,996 |
Asset-backed securities | 1,516,911 |  | 1,496,323 |
Total mortgage and asset-backed securities | 6,048,285 |  | 5,352,358 |
Other debt securities: |  |
Within 1 year | 24,459 |  | 24,152 |
After 1 but within 5 years | 73,750 |  | 68,648 |
After 5 but within 10 years | 92,265 |  | 89,325 |
After 10 years | 24,748 |  | 24,453 |
Total other debt securities | 215,222 |  | 206,578 |
Total available for sale debt securities | $ | 9,680,135 |  | $ | 8,915,779 |
Securities With Unrealized Losses and Length of Impairment Period | The table below summarizes debt securities available for sale in an unrealized loss position, aggregated by length of loss period, for which an allowance for credit losses has not been recorded at June 30, 2025 and December 31, 2024. Unrealized losses on these available for sale securities have not been recognized into income because after review, the securities were deemed not to be impaired. The unrealized losses on these securities are primarily attributable to changes in interest rates and current market conditions. At June 30, 2025, the Company does not intend to sell the securities, nor is it anticipated that it would be required to sell any of these securities at a loss.
| Less than 12 months |  | 12 months or longer |  | Total
(In thousands) | Fair Value | Unrealized Losses |  | Fair Value | Unrealized Losses |  | Fair Value | Unrealized Losses
June 30, 2025 |  |  |  |  |  |  |  |
U.S. government and federal agency obligations | $ | 690,639 |  | $ | 4,040 |  |  | $ | 291,903 |  | $ | 8,709 |  |  | $ | 982,542 |  | $ | 12,749 |
Government-sponsored enterprise obligations | — |  | — |  |  | 44,148 |  | 10,884 |  |  | 44,148 |  | 10,884 |
State and municipal obligations | 10,292 |  | 272 |  |  | 690,932 |  | 59,513 |  |  | 701,224 |  | 59,785 |
Mortgage and asset-backed securities: |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 1,964 |  | 16 |  |  | 3,308,242 |  | 636,145 |  |  | 3,310,206 |  | 636,161 |
Non-agency mortgage-backed securities | — |  | — |  |  | 454,609 |  | 40,278 |  |  | 454,609 |  | 40,278 |
Asset-backed securities | 110,990 |  | 479 |  |  | 701,808 |  | 26,682 |  |  | 812,798 |  | 27,161 |
Total mortgage and asset-backed securities | 112,954 |  | 495 |  |  | 4,464,659 |  | 703,105 |  |  | 4,577,613 |  | 703,600 |
Other debt securities | 26,800 |  | 170 |  |  | 129,891 |  | 9,116 |  |  | 156,691 |  | 9,286 |
Total | $ | 840,685 |  | $ | 4,977 |  |  | $ | 5,621,533 |  | $ | 791,327 |  |  | $ | 6,462,218 |  | $ | 796,304 |
December 31, 2024 |  |  |  |  |  |  |  |
U.S. government and federal agency obligations | $ | 1,492,875 |  | $ | 24,662 |  |  | $ | 353,129 |  | $ | 17,197 |  |  | $ | 1,846,004 |  | $ | 41,859 |
Government-sponsored enterprise obligations | — |  | — |  |  | 42,848 |  | 12,576 |  |  | 42,848 |  | 12,576 |
State and municipal obligations | 14,860 |  | 230 |  |  | 724,587 |  | 79,685 |  |  | 739,447 |  | 79,915 |
Mortgage and asset-backed securities: |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 3,882 |  | 42 |  |  | 3,409,405 |  | 750,664 |  |  | 3,413,287 |  | 750,706 |
Non-agency mortgage-backed securities | 10 |  | — |  |  | 564,637 |  | 56,986 |  |  | 564,647 |  | 56,986 |
Asset-backed securities | 219,414 |  | 2,371 |  |  | 1,083,938 |  | 36,824 |  |  | 1,303,352 |  | 39,195 |
Total mortgage and asset-backed securities | 223,306 |  | 2,413 |  |  | 5,057,980 |  | 844,474 |  |  | 5,281,286 |  | 846,887 |
Other debt securities | 26,390 |  | 579 |  |  | 198,936 |  | 12,718 |  |  | 225,326 |  | 13,297 |
Total | $ | 1,757,431 |  | $ | 27,884 |  |  | $ | 6,377,480 |  | $ | 966,650 |  |  | $ | 8,134,911 |  | $ | 994,534 |
Available For Sale Securities Unrealized Gains And Losses By Security Type | For debt securities classified as available for sale, the following table shows the amortized cost, fair value, and allowance for credit losses of securities available for sale at June 30, 2025 and December 31, 2024, and the corresponding amounts of gross unrealized gains and losses (pre-tax) in AOCI, by security type.
(In thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Allowance for Credit Losses | Fair Value
June 30, 2025 |  |  |  |  |
U.S. government and federal agency obligations | $ | 2,586,856 |  | $ | 23,630 |  | $ | (12,749) |  | $ | — |  | $ | 2,597,737 |
Government-sponsored enterprise obligations | 55,032 |  | — |  | (10,884) |  | — |  | 44,148 |
State and municipal obligations | 774,740 |  | 3 |  | (59,785) |  | — |  | 714,958 |
Mortgage and asset-backed securities: |  |  |  |  |
Agency mortgage-backed securities | 3,991,521 |  | 679 |  | (636,161) |  | — |  | 3,356,039 |
Non-agency mortgage-backed securities | 539,853 |  | 421 |  | (40,278) |  | — |  | 499,996 |
Asset-backed securities | 1,516,911 |  | 6,573 |  | (27,161) |  | — |  | 1,496,323 |
Total mortgage and asset-backed securities | 6,048,285 |  | 7,673 |  | (703,600) |  | — |  | 5,352,358 |
Other debt securities | 215,222 |  | 642 |  | (9,286) |  | — |  | 206,578 |
Total | $ | 9,680,135 |  | $ | 31,948 |  | $ | (796,304) |  | $ | — |  | $ | 8,915,779 |
December 31, 2024 |  |  |  |  |
U.S. government and federal agency obligations | $ | 2,594,130 |  | $ | 2,981 |  | $ | (41,859) |  | $ | — |  | $ | 2,555,252 |
Government-sponsored enterprise obligations | 55,425 |  | — |  | (12,576) |  | — |  | 42,849 |
State and municipal obligations | 822,790 |  | 16 |  | (79,915) |  | — |  | 742,891 |
Mortgage and asset-backed securities: |  |  |  |  |
Agency mortgage-backed securities | 4,195,182 |  | 415 |  | (750,706) |  | — |  | 3,444,891 |
Non-agency mortgage-backed securities | 625,539 |  | 136 |  | (56,986) |  | — |  | 568,689 |
Asset-backed securities | 1,595,797 |  | 413 |  | (39,195) |  | — |  | 1,557,015 |
Total mortgage and asset-backed securities | 6,416,518 |  | 964 |  | (846,887) |  | — |  | 5,570,595 |
Other debt securities | 238,563 |  | — |  | (13,297) |  | — |  | 225,266 |
Total | $ | 10,127,426 |  | $ | 3,961 |  | $ | (994,534) |  | $ | — |  | $ | 9,136,853 |
Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses | The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.
| For the Six Months Ended June 30
(In thousands) | 2025 | 2024
Proceeds from sales of securities: |  |
Available for sale debt securities | $ | 36,065 |  | $ | 1,015,845 |
Equity securities | — |  | 120,012 |
Other investments | 10,029 |  | 21,319 |
Total proceeds | $ | 46,094 |  | $ | 1,157,176 |
Investment securities gains (losses), net: |  |
Available for sale debt securities: |  |
Gains realized on sales | $ | 4 |  | $ | — |
Losses realized on sales | (4,218) |  | (187,543) |
Equity securities: |  |
Gains (losses) on equity securities, net | 1,777 |  | 178,306 |
Other: |  |
Gains realized on sales | 1,167 |  | 956 |
Losses realized on sales | (1,773) |  | (1,522) |
Fair value adjustments, net | (4,111) |  | 12,777 |
Total investment securities gains (losses), net | $ | (7,154) |  | $ | 2,974 |

X
- Definition Investment Securities Disclosure + References No definition available. + Details
Name: | cbsh_InvestmentSecuritiesAbstract
Namespace Prefix: | cbsh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses Recognized In Earnings [Table Text Block] + References No definition available. + Details
Name: | cbsh_ProceedsFromSalesOfSecuritiesAndComponentsOfInvestmentSecuritiesGainsAndLossesRecognizedInEarningsTableTextBlock
Namespace Prefix: | cbsh_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_GainLossOnInvestmentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the summary of investment holdings. + References No definition available. + Details
Name: | us-gaap_SummaryInvestmentHoldingsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration