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Capital Requirements and Regulatory Restrictions (Tables)
 12 Months Ended
Dec. 31, 2015
Capital Requirements and Regulatory Restrictions [Abstract]  
Schedule of Capital Amounts and Ratios
    Capital   Requirement to be
Actual Requirements Well-Capitalized
(In thousands) Amount Ratio Amount   Ratio   Amount   Ratio
At December 31, 2015                          
Total capital (to risk-weighted assets)
       Cass Information Systems, Inc.   $ 212,717   23.31 %   $ 72,994   8.00 %   $ N/A   N/A %
       Cass Commercial Bank   99,872   16.90       47,281   8.00       59,102   10.00  
Common Equity Tier I Capital (to risk-weighted assets)                                    
Cass Information Systems, Inc.     201,312    22.06        41,059    4.50        N/A    N/A   
Cass Commercial Bank      92,470    15.65        26,596    4.50        38,416    6.50   
Tier I capital (to risk-weighted assets)                                    
       Cass Information Systems, Inc.   201,312   22.06       54,746   6.00       N/A   N/A  
       Cass Commercial Bank     92,470   15.65       35,461   6.00       47,281   8.00  
Tier I capital (to average assets)                                  
       Cass Information Systems, Inc.     201,312   13.88       43,496   3.00       N/A   N/A  
       Cass Commercial Bank     92,470   13.15       21,093   3.00       35,155   5.00  
At December 31, 2014                                    
Total capital (to risk-weighted assets)                                  
       Cass Information Systems, Inc.   $ 207,468   21.91 %   $ 75,761   8.00 %   $ N/A   N/A %
       Cass Commercial Bank   91,249   15.88       45,977   8.00       57,472   10.00  
 Common Equity Tier I Capital (to risk-weighted assets)                                    
Cass Information Systems, Inc.      195,630    20.66        37,880    4.00        N/A    N/A   
Cass Commercial Bank      84,049    14.62        22,989    4.00        34,483    6.00   
Tier I capital (to risk-weighted assets)                                    
       Cass Information Systems, Inc.   195,630   20.66       37,880   4.00       N/A   N/A  
       Cass Commercial Bank     84,049   14.62       22,989   4.00       34,483   6.00  
Tier I capital (to average assets)                                    
       Cass Information Systems, Inc.     195,630   13.42       43,742   3.00       N/A   N/A  
       Cass Commercial Bank     84,049   11.94       21,124   3.00       35,207   5.00