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Capital Requirements and Regulatory Restrictions - Schedule of Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Cass Information Systems, Inc. |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), actual, amount | $ 269,580 | $ 257,313
Common equity tier I capital (to risk-weighted assets), actual, amount | 256,359 | 243,774
Tier I capital (to risk-weighted assets), actual, amount | 256,359 | 243,774
Tier I capital (to average assets), actual, amount | $ 256,359 | $ 243,774
Total capital (to risk-weighted assets), actual, ratio | 15.49% | 13.52%
Common equity tier I capital (to risk-weighted assets), actual, ratio | 14.73% | 12.80%
Tier I capital (to risk-weighted assets), actual, ratio | 14.73% | 12.80%
Tier I capital (to average assets), actual, ratio | 10.71% | 9.52%
Total capital (to risk-weighted assets), capital requirements, amount | $ 139,266 | $ 152,306
Common equity tier I capital (to risk-weighted assets), capital requirements, amount | 78,337 | 85,672
Tier I capital (to risk-weighted assets), capital requirements, amount | 104,449 | 114,229
Tier I capital (to average assets), capital requirements, amount | $ 95,760 | $ 102,386
Total capital (to risk-weighted assets), capital requirements, ratio | 8.00% | 8.00%
Common equity tier I capital (to risk-weighted assets), capital requirements, ratio | 4.50% | 4.50%
Tier I capital (to risk-weighted assets), capital requirements, ratio | 6.00% | 6.00%
Tier I capital (to average assets), capital requirements, ratio | 4.00% | 4.00%
Cass Commercial Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), actual, amount | $ 204,584 | $ 186,075
Common equity tier I capital (to risk-weighted assets), actual, amount | 192,104 | 172,848
Tier I capital (to risk-weighted assets), actual, amount | 192,104 | 172,848
Tier I capital (to average assets), actual, amount | $ 192,104 | $ 172,848
Total capital (to risk-weighted assets), actual, ratio | 19.04% | 16.00%
Common equity tier I capital (to risk-weighted assets), actual, ratio | 17.88% | 14.86%
Tier I capital (to risk-weighted assets), actual, ratio | 17.88% | 14.86%
Tier I capital (to average assets), actual, ratio | 12.49% | 10.77%
Total capital (to risk-weighted assets), capital requirements, amount | $ 85,964 | $ 93,044
Common equity tier I capital (to risk-weighted assets), capital requirements, amount | 48,355 | 52,337
Tier I capital (to risk-weighted assets), capital requirements, amount | 64,473 | 69,783
Tier I capital (to average assets), capital requirements, amount | $ 61,526 | $ 64,196
Total capital (to risk-weighted assets), capital requirements, ratio | 8.00% | 8.00%
Common equity tier I capital (to risk-weighted assets), capital requirements, ratio | 4.50% | 4.50%
Tier I capital (to risk-weighted assets), capital requirements, ratio | 6.00% | 6.00%
Tier I capital (to average assets), capital requirements, ratio | 4.00% | 4.00%
Total capital (to risk weighted assets), requirement to be well-capitalized, amount | $ 107,455 | $ 116,305
Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount | 69,846 | 75,598
Tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount | 85,964 | 93,044
Tier I capital (to average assets), requirement to be well-capitalized, amount | $ 76,908 | $ 80,245
Total capital (to risk weighted assets), requirement to be well-capitalized, ratio | 10.00% | 10.00%
Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, ratio | 6.50% | 6.50%
Tier I capital (to risk-weighted assets), requirement to be well-capitalized, ratio | 8.00% | 8.00%
Tier I capital (to average assets), requirement to be well-capitalized, ratio | 5.00% | 5.00%

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