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Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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 | $ 234,389 | $ 219,747
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 224,184 | 209,572
Tier I capital (to risk-weighted assets), actual amount | 224,184 | 209,572
Tier I capital (to average assets), actual amount | $ 224,184 | $ 209,572
Total capital (to risk-weighted assets), actual ratio | 22.53% | 22.75%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 21.55% | 21.70%
Tier I capital (to risk-weighted assets), actual ratio | 21.55% | 21.70%
Tier I capital (to average assets), actual ratio | 13.87% | 13.83%
Total capital (to risk-weighted assets), capital requirements amount | $ 83,233 | $ 77,272
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 46,819 | 43,466
Tier I capital (to risk-weighted assets), capital requirements amount | 62,425 | 57,954
Tier I capital (to average assets), capital requirements amount | $ 64,649 | $ 60,620
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 | $ 122,440 | $ 110,576
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 114,603 | 102,769
Tier I capital (to risk-weighted assets), actual amount | 114,603 | 102,769
Tier I capital (to average assets), actual amount | $ 114,603 | $ 102,769
Total capital (to risk-weighted assets), actual ratio | 17.01% | 16.72%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 15.93% | 15.54%
Tier I capital (to risk-weighted assets), actual ratio | 15.93% | 15.54%
Tier I capital (to average assets), actual ratio | 14.99% | 13.98%
Total capital (to risk-weighted assets), capital requirements amount | $ 57,568 | $ 52,898
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 32,382 | 29,755
Tier I capital (to risk-weighted assets), capital requirements amount | 43,176 | 39,674
Tier I capital (to average assets), capital requirements amount | $ 30,581 | $ 29,409
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 | $ 71,960 | $ 66,123
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount | 46,774 | 42,980
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount | 57,568 | 52,898
Tier I capital (to average assets), requirement to be well capitalized amount | $ 38,227 | $ 36,761
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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