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v2.4.0.6

Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
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Dec. 31, 2012
Common Stock Dividend Rate Percentage | 10.00%
Cost Method Investment, Ownership Percentage | 20.00%
Building [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Leaseholds and Leasehold Improvements [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Property, Plant and Equipment, Other Types [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 7 years

X
- Definition The percentage rate used to calculate dividend payments on common stock. + References No definition available. + Details
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Balance Type: | na
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X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the cost method of accounting. + References No definition available. + Details
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Namespace Prefix: | cass_
Data Type: | num:percentItemType
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Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration