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Capital Requirements and Regulatory Restrictions (Tables)
 12 Months Ended
Dec. 31, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
The Company’s and the Bank’s actual and required capital amounts and ratios are as follows:
ActualCapital
Requirements		Requirement to be
Well-Capitalized
(In thousands)AmountRatioAmountRatioAmountRatio
At December 31, 2023
Total capital (to risk-weighted assets)
Cass Information Systems, Inc. $269,580 15.49 %$139,266 8.00 %$        N/AN/A %
Cass Commercial Bank 204,584 19.04 85,964 8.00 107,455 10.00 
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc. 256,359 14.73 78,337 4.50 N/AN/A
Cass Commercial Bank 192,104 17.88 48,355 4.50 69,846 6.50 
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc. 256,359 14.73 104,449 6.00 N/AN/A
Cass Commercial Bank 192,104 17.88 64,473 6.00 85,964 8.00 
Tier I capital (to average assets)
Cass Information Systems, Inc. 256,359 10.71 95,760 4.00 N/AN/A
Cass Commercial Bank 192,104 12.49 61,526 4.00 76,908 5.00 
At December 31, 2022
Total capital (to risk-weighted assets)
Cass Information Systems, Inc. $257,313 13.52 %$152,306 8.00 %$        N/AN/A %
Cass Commercial Bank 186,075 16.00 93,044 8.00 116,305 10.00 
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc. 243,774 12.80 85,672 4.50 N/AN/A
Cass Commercial Bank 172,848 14.86 52,337 4.50 75,598 6.50 
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc. 243,774 12.80 114,229 6.00 N/AN/A
Cass Commercial Bank 172,848 14.86 69,783 6.00 93,044 8.00 
Tier I capital (to average assets)
Cass Information Systems, Inc. 243,774 9.52 102,386 4.00 N/AN/A
Cass Commercial Bank 172,848 10.77 64,196 4.00 80,245 5.00