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Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Cass Information Systems Inc. [Member] |  |
Total capital (to risk-weighted assets), actual amount | $ 212,717 | $ 207,468
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 201,312 | 195,630
Tier I capital (to risk-weighted assets), actual amount | 201,312 | 195,630
Tier I capital (to average assets), actual amount | $ 201,312 | $ 195,630
Total capital (to risk-weighted assets), actual ratio | 23.31% | 21.91%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 22.06% | 20.66%
Tier I capital (to risk-weighted assets), actual ratio | 22.06% | 20.66%
Tier I capital (to average assets), actual ratio | 13.88% | 13.42%
Total capital (to risk-weighted assets), capital requirements amount | $ 72,994 | $ 75,761
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 41,059 | 37,880
Tier I capital (to risk-weighted assets), capital requirements amount | 54,746 | 37,880
Tier I capital (to average assets), capital requirements amount | $ 43,496 | $ 43,742
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% | 4.00%
Tier I capital (to risk-weighted assets), capital requirements ratio | 6.00% | 4.00%
Tier I capital (to average assets), capital requirements ratio | 3.00% | 3.00%
Cass Commercial Bank [Member] |  |
Total capital (to risk-weighted assets), actual amount | $ 99,872 | $ 91,249
Common Equity Tier I Capital (to risk-weighted assets), actual amount | 92,470 | 84,049
Tier I capital (to risk-weighted assets), actual amount | 92,470 | 84,049
Tier I capital (to average assets), actual amount | $ 92,470 | $ 84,049
Total capital (to risk-weighted assets), actual ratio | 16.90% | 15.88%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio | 15.65% | 14.62%
Tier I capital (to risk-weighted assets), actual ratio | 15.65% | 14.62%
Tier I capital (to average assets), actual ratio | 13.15% | 11.94%
Total capital (to risk-weighted assets), capital requirements amount | $ 47,281 | $ 45,977
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount | 26,596 | 22,989
Tier I capital (to risk-weighted assets), capital requirements amount | 35,461 | 22,989
Tier I capital (to average assets), capital requirements amount | $ 21,093 | $ 21,124
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% | 4.00%
Tier I capital (to risk-weighted assets), capital requirements ratio | 6.00% | 4.00%
Tier I capital (to average assets), capital requirements ratio | 3.00% | 3.00%
Total capital (to risk-weighted assets), requirement to be well capitalized amount | $ 59,102 | $ 57,472
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount | 38,416 | 34,483
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount | 47,281 | 34,483
Tier I capital (to average assets), requirement to be well capitalized amount | $ 35,155 | $ 35,207
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% | 6.00%
Tier I capital (to risk-weighted assets), requirement to be well capitalized ratio | 8.00% | 6.00%
Tier I capital (to average assets), requirement to be well capitalized ratio | 5.00% | 5.00%

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