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Industry Segment Information (Details Textual) | 12 Months Ended
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Dec. 31, 2012
Loan Description | Assets represent actual assets owned by Information Services and Banking Services and there is no allocation methodology used. Loans are sold by Banking Services to Information Services to create liquidity when the Bank's loan to deposit ratio is greater than 100%.

X
- 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