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Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Cass Information Systems Inc. [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), actual amount | $ 249,954 | $ 244,660
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 239,398 | 234,435
Tier I capital (to risk-weighted assets), actual amount | 239,398 | 234,435
Tier I capital (to average assets), actual amount | $ 239,398 | $ 234,435
Total capital (to risk-weighted assets), actual ratio | 19.70% | 21.38%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 18.86% | 20.49%
Tier I capital (to risk-weighted assets), actual ratio | 18.86% | 20.49%
Tier I capital (to average assets), actual ratio | 13.24% | 13.89%
Total capital (to risk-weighted assets), capital requirements amount | $ 101,530 | $ 91,550
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 57,110 | 51,497
Tier I capital (to risk-weighted assets), capital requirements amount | 76,147 | 68,662
Tier I capital (to average assets), capital requirements amount | $ 72,329 | $ 67,500
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 [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), actual amount | $ 154,011 | $ 137,894
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 145,673 | 130,037
Tier I capital (to risk-weighted assets), actual amount | 145,673 | 130,037
Tier I capital (to average assets), actual amount | $ 145,673 | $ 130,037
Total capital (to risk-weighted assets), actual ratio | 19.32% | 18.31%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 18.27% | 17.26%
Tier I capital (to risk-weighted assets), actual ratio | 18.27% | 17.26%
Tier I capital (to average assets), actual ratio | 16.64% | 15.35%
Total capital (to risk-weighted assets), capital requirements amount | $ 63,778 | $ 60,257
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 35,875 | 33,895
Tier I capital (to risk-weighted assets), capital requirements amount | 47,833 | 45,193
Tier I capital (to average assets), capital requirements amount | $ 35,012 | $ 33,884
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 | $ 79,722 | $ 75,321
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount | 51,819 | 48,959
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount | 63,778 | 60,257
Tier I capital (to average assets), requirement to be well capitalized amount | $ 43,765 | $ 42,354
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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