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Capital Requirements and Regulatory Restrictions (Tables) | 12 Months Ended
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Dec. 31, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The Company’s and the Bank’s actual and required capital amounts and ratios are as follows:
| Actual |  | Capital Requirements |  | Requirement to be Well-Capitalized
(In thousands) | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
At December 31, 2023 |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | $ | 269,580 |  |  | 15.49 | % |  | $ | 139,266 |  |  | 8.00 | % |  | $ N/A |  | N/A %
Cass Commercial Bank | 204,584 |  |  | 19.04 |  |  | 85,964 |  |  | 8.00 |  |  | 107,455 |  |  | 10.00 |
Common Equity Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 256,359 |  |  | 14.73 |  |  | 78,337 |  |  | 4.50 |  |  | N/A |  | N/A
Cass Commercial Bank | 192,104 |  |  | 17.88 |  |  | 48,355 |  |  | 4.50 |  |  | 69,846 |  |  | 6.50 |
Tier I capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 256,359 |  |  | 14.73 |  |  | 104,449 |  |  | 6.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 192,104 |  |  | 17.88 |  |  | 64,473 |  |  | 6.00 |  |  | 85,964 |  |  | 8.00 |
Tier I capital (to average assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 256,359 |  |  | 10.71 |  |  | 95,760 |  |  | 4.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 192,104 |  |  | 12.49 |  |  | 61,526 |  |  | 4.00 |  |  | 76,908 |  |  | 5.00 |
At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | $ | 257,313 |  |  | 13.52 | % |  | $ | 152,306 |  |  | 8.00 | % |  | $ N/A |  | N/A %
Cass Commercial Bank | 186,075 |  |  | 16.00 |  |  | 93,044 |  |  | 8.00 |  |  | 116,305 |  |  | 10.00 |
Common Equity Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 243,774 |  |  | 12.80 |  |  | 85,672 |  |  | 4.50 |  |  | N/A |  | N/A
Cass Commercial Bank | 172,848 |  |  | 14.86 |  |  | 52,337 |  |  | 4.50 |  |  | 75,598 |  |  | 6.50 |
Tier I capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 243,774 |  |  | 12.80 |  |  | 114,229 |  |  | 6.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 172,848 |  |  | 14.86 |  |  | 69,783 |  |  | 6.00 |  |  | 93,044 |  |  | 8.00 |
Tier I capital (to average assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 243,774 |  |  | 9.52 |  |  | 102,386 |  |  | 4.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 172,848 |  |  | 10.77 |  |  | 64,196 |  |  | 4.00 |  |  | 80,245 |  |  | 5.00 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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