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Capital Requirements and Regulatory Restrictions - Schedule of Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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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 | $ 261,021 | $ 269,580
Common equity tier I capital (to risk-weighted assets), actual, amount | 247,354 | 256,359
Tier I capital (to risk-weighted assets), actual, amount | 247,354 | 256,359
Tier I capital (to average assets), actual, amount | $ 247,354 | $ 256,359
Total capital (to risk-weighted assets), actual, ratio | 14.61% | 15.49%
Common equity tier I capital (to risk-weighted assets), actual, ratio | 13.84% | 14.73%
Tier I capital (to risk-weighted assets), actual, ratio | 13.84% | 14.73%
Tier I capital (to average assets), actual, ratio | 10.57% | 10.71%
Total capital (to risk-weighted assets), capital requirements, amount | $ 142,969 | $ 139,266
Common equity tier I capital (to risk-weighted assets), capital requirements, amount | 80,420 | 78,337
Tier I capital (to risk-weighted assets), capital requirements, amount | 107,226 | 104,449
Tier I capital (to average assets), capital requirements, amount | $ 93,625 | $ 95,760
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 | $ 207,519 | $ 204,584
Common equity tier I capital (to risk-weighted assets), actual, amount | 194,446 | 192,104
Tier I capital (to risk-weighted assets), actual, amount | 194,446 | 192,104
Tier I capital (to average assets), actual, amount | $ 194,446 | $ 192,104
Total capital (to risk-weighted assets), actual, ratio | 17.68% | 19.04%
Common equity tier I capital (to risk-weighted assets), actual, ratio | 16.56% | 17.88%
Tier I capital (to risk-weighted assets), actual, ratio | 16.56% | 17.88%
Tier I capital (to average assets), actual, ratio | 13.50% | 12.49%
Total capital (to risk-weighted assets), capital requirements, amount | $ 93,911 | $ 85,964
Common equity tier I capital (to risk-weighted assets), capital requirements, amount | 52,825 | 48,355
Tier I capital (to risk-weighted assets), capital requirements, amount | 70,433 | 64,473
Tier I capital (to average assets), capital requirements, amount | $ 57,620 | $ 61,526
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 | $ 117,389 | $ 107,455
Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount | 76,303 | 69,846
Tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount | 93,911 | 85,964
Tier I capital (to average assets), requirement to be well-capitalized, amount | $ 72,026 | $ 76,908
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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