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Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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 | $ 219,747 | $ 212,717
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 209,572 | 201,312
Tier I capital (to risk-weighted assets), actual amount | 209,572 | 201,312
Tier I capital (to average assets), actual amount | $ 209,572 | $ 201,312
Total capital (to risk-weighted assets), actual ratio | 22.75% | 23.31%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 21.70% | 22.06%
Tier I capital (to risk-weighted assets), actual ratio | 21.70% | 22.06%
Tier I capital (to average assets), actual ratio | 13.83% | 13.88%
Total capital (to risk-weighted assets), capital requirements amount | $ 77,272 | $ 72,994
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 43,466 | 41,059
Tier I capital (to risk-weighted assets), capital requirements amount | 57,954 | 54,746
Tier I capital (to average assets), capital requirements amount | $ 60,620 | $ 43,496
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% | 3.00%
Cass Commercial Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), actual amount | $ 110,576 | $ 99,872
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 102,769 | 92,470
Tier I capital (to risk-weighted assets), actual amount | 102,769 | 92,470
Tier I capital (to average assets), actual amount | $ 102,769 | $ 92,470
Total capital (to risk-weighted assets), actual ratio | 16.72% | 16.90%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 15.54% | 15.65%
Tier I capital (to risk-weighted assets), actual ratio | 15.54% | 15.65%
Tier I capital (to average assets), actual ratio | 13.98% | 13.15%
Total capital (to risk-weighted assets), capital requirements amount | $ 52,898 | $ 47,281
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 29,755 | 26,596
Tier I capital (to risk-weighted assets), capital requirements amount | 39,674 | 35,461
Tier I capital (to average assets), capital requirements amount | $ 29,409 | $ 21,093
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% | 3.00%
Total capital (to risk-weighted assets), requirement to be well capitalized amount | $ 66,123 | $ 59,102
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount | 42,980 | 38,416
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount | 52,898 | 47,281
Tier I capital (to average assets), requirement to be well capitalized amount | $ 36,761 | $ 35,155
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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