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Capital Requirements and Regulatory Restrictions - Schedule of Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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 | $ 257,313 | $ 240,265
Common equity tier I capital (to risk-weighted assets), actual, amount | 243,774 | 228,224
Tier I capital (to risk-weighted assets), actual, amount | 243,774 | 228,224
Tier I capital (to average assets), actual, amount | $ 243,774 | $ 228,224
Total capital (to risk-weighted assets), actual, ratio | 13.52% | 14.86%
Common equity tier I capital (to risk-weighted assets), actual, ratio | 12.80% | 14.11%
Tier I capital (to risk-weighted assets), actual, ratio | 12.80% | 14.11%
Tier I capital (to average assets), actual, ratio | 9.52% | 9.21%
Total capital (to risk-weighted assets), capital requirements, amount | $ 152,306 | $ 129,339
Common equity tier I capital (to risk-weighted assets), capital requirements, amount | 85,672 | 72,764
Tier I capital (to risk-weighted assets), capital requirements, amount | 114,229 | 97,019
Tier I capital (to average assets), capital requirements, amount | $ 102,386 | $ 99,163
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 | $ 186,075 | $ 174,614
Common equity tier I capital (to risk-weighted assets), actual, amount | 172,848 | 163,030
Tier I capital (to risk-weighted assets), actual, amount | 172,848 | 163,030
Tier I capital (to average assets), actual, amount | $ 172,848 | $ 163,030
Total capital (to risk-weighted assets), actual, ratio | 16.00% | 17.21%
Common equity tier I capital (to risk-weighted assets), actual, ratio | 14.86% | 16.07%
Tier I capital (to risk-weighted assets), actual, ratio | 14.86% | 16.07%
Tier I capital (to average assets), actual, ratio | 10.77% | 11.05%
Total capital (to risk-weighted assets), capital requirements, amount | $ 93,044 | $ 81,163
Common equity tier I capital (to risk-weighted assets), capital requirements, amount | 52,337 | 45,654
Tier I capital (to risk-weighted assets), capital requirements, amount | 69,783 | 60,872
Tier I capital (to average assets), capital requirements, amount | $ 64,196 | $ 59,036
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 | $ 116,305 | $ 101,454
Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount | 75,598 | 65,945
Tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount | 93,044 | 81,163
Tier I capital (to average assets), requirement to be well-capitalized, amount | $ 80,245 | $ 73,795
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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