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Capital Requirements and Regulatory Restrictions - Schedule of Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Cass Information Systems, Inc.    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), actual, amount $ 261,021 $ 269,580
Common equity tier I capital (to risk-weighted assets), actual, amount 247,354 256,359
Tier I capital (to risk-weighted assets), actual, amount 247,354 256,359
Tier I capital (to average assets), actual, amount $ 247,354 $ 256,359
Total capital (to risk-weighted assets), actual, ratio 14.61% 15.49%
Common equity tier I capital (to risk-weighted assets), actual, ratio 13.84% 14.73%
Tier I capital (to risk-weighted assets), actual, ratio 13.84% 14.73%
Tier I capital (to average assets), actual, ratio 10.57% 10.71%
Total capital (to risk-weighted assets), capital requirements, amount $ 142,969 $ 139,266
Common equity tier I capital (to risk-weighted assets), capital requirements, amount 80,420 78,337
Tier I capital (to risk-weighted assets), capital requirements, amount 107,226 104,449
Tier I capital (to average assets), capital requirements, amount $ 93,625 $ 95,760
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 $ 207,519 $ 204,584
Common equity tier I capital (to risk-weighted assets), actual, amount 194,446 192,104
Tier I capital (to risk-weighted assets), actual, amount 194,446 192,104
Tier I capital (to average assets), actual, amount $ 194,446 $ 192,104
Total capital (to risk-weighted assets), actual, ratio 17.68% 19.04%
Common equity tier I capital (to risk-weighted assets), actual, ratio 16.56% 17.88%
Tier I capital (to risk-weighted assets), actual, ratio 16.56% 17.88%
Tier I capital (to average assets), actual, ratio 13.50% 12.49%
Total capital (to risk-weighted assets), capital requirements, amount $ 93,911 $ 85,964
Common equity tier I capital (to risk-weighted assets), capital requirements, amount 52,825 48,355
Tier I capital (to risk-weighted assets), capital requirements, amount 70,433 64,473
Tier I capital (to average assets), capital requirements, amount $ 57,620 $ 61,526
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 $ 117,389 $ 107,455
Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount 76,303 69,846
Tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount 93,911 85,964
Tier I capital (to average assets), requirement to be well-capitalized, amount $ 72,026 $ 76,908
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%