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Capital Requirements and Regulatory Restrictions (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | $ | 240,265 |  |  | 14.86 | % |  | $ | 129,339 |  |  | 8.00 | % |  | $ N/A |  | N/A %
Cass Commercial Bank | 174,614 |  |  | 17.21 |  |  | 81,163 |  |  | 8.00 |  |  | 101,454 |  |  | 10.00 |
Common Equity Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 228,224 |  |  | 14.11 |  |  | 72,764 |  |  | 4.50 |  |  | N/A |  | N/A
Cass Commercial Bank | 163,030 |  |  | 16.07 |  |  | 45,654 |  |  | 4.50 |  |  | 65,945 |  |  | 6.50 |
Tier I capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 228,224 |  |  | 14.11 |  |  | 97,019 |  |  | 6.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 163,030 |  |  | 16.07 |  |  | 60,872 |  |  | 6.00 |  |  | 81,163 |  |  | 8.00 |
Tier I capital (to average assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 228,224 |  |  | 9.21 |  |  | 99,163 |  |  | 4.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 163,030 |  |  | 11.05 |  |  | 59,036 |  |  | 4.00 |  |  | 73,795 |  |  | 5.00 |
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | $ | 255,332 |  |  | 21.41 | % |  | $ | 95,388 |  |  | 8.00 | % |  | $ N/A |  | N/A %
Cass Commercial Bank | 171,298 |  |  | 21.46 |  |  | 63,855 |  |  | 8.00 |  |  | 79,819 |  |  | 10.00 |
Common Equity Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 243,388 |  |  | 20.41 |  |  | 53,656 |  |  | 4.50 |  |  | N/A |  | N/A
Cass Commercial Bank | 161,300 |  |  | 20.21 |  |  | 35,918 |  |  | 4.50 |  |  | 51,882 |  |  | 6.50 |
Tier I capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 243,388 |  |  | 20.41 |  |  | 71,541 |  |  | 6.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 161,300 |  |  | 20.21 |  |  | 47,891 |  |  | 6.00 |  |  | 63,855 |  |  | 8.00 |
Tier I capital (to average assets) |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. | 243,388 |  |  | 11.52 |  |  | 84,511 |  |  | 4.00 |  |  | N/A |  | N/A
Cass Commercial Bank | 161,300 |  |  | 14.48 |  |  | 44,543 |  |  | 4.00 |  |  | 55,679 |  |  | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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