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Industry Segment Information (Details Textual) | 6 Months Ended
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Jun. 30, 2012
Loan Description | Assets represent actual assets owned by Information Services and there is no allocation methodology used. Loans are sold by Banking Services to Information Services to create liquidity when the loan-to-deposit ratio of the Company's bank subsidiary, Cass Commercial Bank (the "Bank") is greater than 100%.

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- Definition Description relating to loans. + References No definition available. + Details
Name: | cass_LoanDescription
Namespace Prefix: | cass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration