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Industry Segment Information (Details Textual)	3 Months Ended
	Mar. 31, 2013
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 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