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Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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 | $ 244,660 | $ 234,389
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 234,435 | 224,184
Tier I capital (to risk-weighted assets), actual amount | 234,435 | 224,184
Tier I capital (to average assets), actual amount | $ 234,435 | $ 224,184
Total capital (to risk-weighted assets), actual ratio | 21.38% | 22.53%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 20.49% | 21.55%
Tier I capital (to risk-weighted assets), actual ratio | 20.49% | 21.55%
Tier I capital (to average assets), actual ratio | 13.89% | 13.87%
Total capital (to risk-weighted assets), capital requirements amount | $ 91,550 | $ 83,233
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 51,497 | 46,819
Tier I capital (to risk-weighted assets), capital requirements amount | 68,662 | 62,425
Tier I capital (to average assets), capital requirements amount | $ 67,500 | $ 64,649
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 | $ 137,894 | $ 122,440
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 130,037 | 114,603
Tier I capital (to risk-weighted assets), actual amount | 130,037 | 114,603
Tier I capital (to average assets), actual amount | $ 130,037 | $ 114,603
Total capital (to risk-weighted assets), actual ratio | 18.31% | 17.01%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 17.26% | 15.93%
Tier I capital (to risk-weighted assets), actual ratio | 17.26% | 15.93%
Tier I capital (to average assets), actual ratio | 15.35% | 14.99%
Total capital (to risk-weighted assets), capital requirements amount | $ 60,257 | $ 57,568
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 33,895 | 32,382
Tier I capital (to risk-weighted assets), capital requirements amount | 45,193 | 43,176
Tier I capital (to average assets), capital requirements amount | $ 33,884 | $ 30,581
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 | $ 75,321 | $ 71,960
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount | 48,959 | 46,774
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount | 60,257 | 57,568
Tier I capital (to average assets), requirement to be well capitalized amount | $ 42,354 | $ 38,227
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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