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Basis of Presentation (Details Textual) | 12 Months Ended
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Dec. 31, 2011
Common Stock Dividend Rate Percentage | 10.00%

X
- Definition The percentage rate used to calculate dividend payments on common stock. + References No definition available. + Details
Name: | cass_CommonStockDividendRatePercentage
Namespace Prefix: | cass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration