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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
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%