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Capital Requirements and Regulatory Restrictions - Schedule of Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Cass Information Systems, Inc. |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to risk-weighted assets), Actual, Amount | $ 240,265 | $ 255,332
Common Equity Tier I Capital (to risk-weighted assets), Actual, Amount | 228,224 | 243,388
Tier I Capital (to risk-weighted assets), Actual, Amount | 228,224 | 243,388
Tier I Capital (to average assets), Actual, Amount | $ 228,224 | $ 243,388
Total Capital (to risk-weighted assets), Actual, Ratio | 14.86% | 21.41%
Common Equity Tier I Capital (to risk-weighted assets), Actual, Ratio | 14.11% | 20.41%
Tier I Capital (to risk-weighted assets), Actual, Ratio | 14.11% | 20.41%
Tier I Capital (to average assets), Actual, Ratio | 9.21% | 11.52%
Total Capital (to risk-weighted assets), Capital Requirements, Amount | $ 129,339 | $ 95,388
Common Equity Tier I Capital (to risk-weighted assets), Capital Requirements, Amount | 72,764 | 53,656
Tier I Capital (to risk-weighted assets), Capital Requirements, Amount | 97,019 | 71,541
Tier I Capital (to average assets), Capital Requirements, Amount | $ 99,163 | $ 84,511
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 |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to risk-weighted assets), Actual, Amount | $ 174,614 | $ 171,298
Common Equity Tier I Capital (to risk-weighted assets), Actual, Amount | 163,030 | 161,300
Tier I Capital (to risk-weighted assets), Actual, Amount | 163,030 | 161,300
Tier I Capital (to average assets), Actual, Amount | $ 163,030 | $ 161,300
Total Capital (to risk-weighted assets), Actual, Ratio | 17.21% | 21.46%
Common Equity Tier I Capital (to risk-weighted assets), Actual, Ratio | 16.07% | 20.21%
Tier I Capital (to risk-weighted assets), Actual, Ratio | 16.07% | 20.21%
Tier I Capital (to average assets), Actual, Ratio | 11.05% | 14.48%
Total Capital (to risk-weighted assets), Capital Requirements, Amount | $ 81,163 | $ 63,855
Common Equity Tier I Capital (to risk-weighted assets), Capital Requirements, Amount | 45,654 | 35,918
Tier I Capital (to risk-weighted assets), Capital Requirements, Amount | 60,872 | 47,891
Tier I Capital (to average assets), Capital Requirements, Amount | $ 59,036 | $ 44,543
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 | $ 101,454 | $ 79,819
Common Equity Tier I Capital (to risk-weighted assets), Requirement to be Well-Capitalized, Amount | 65,945 | 51,882
Tier I Capital (to risk-weighted assets), Requirement to be Well-Capitalized, Amount | 81,163 | 63,855
Tier I Capital (to average assets), Requirement to be Well-Capitalized, Amount | $ 73,795 | $ 55,679
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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