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Employee Benefit Plans (Details 5) | 12 Months Ended
--- | ---
Dec. 31, 2012
Expected Long-Term Return on Class | 10.00%
Assumption | 7.30%
Fixed Income Funds [Member] |
X Allocation | 50.00%
Equity Securities [Member] |
X Allocation | 34.00%
Foreign Equity Securities [Member] |
X Allocation | 16.00%
Minimum [Member] |
Assumption | 4.00%
Minimum [Member] | Fixed Income Funds [Member] |
Expected Long-Term Return on Class | 3.00%
Assumption | 1.50%
Minimum [Member] | Equity Securities [Member] |
Expected Long-Term Return on Class | 5.00%
Assumption | 1.70%
Minimum [Member] | Foreign Equity Securities [Member] |
Expected Long-Term Return on Class | 5.00%
Assumption | 0.80%
Maximum [Member] |
Assumption | 7.30%
Maximum [Member] | Fixed Income Funds [Member] |
Expected Long-Term Return on Class | 5.00%
Assumption | 2.50%
Maximum [Member] | Equity Securities [Member] |
Expected Long-Term Return on Class | 9.00%
Assumption | 3.10%
Maximum [Member] | Foreign Equity Securities [Member] |
Expected Long-Term Return on Class | 10.00%
Assumption | 1.70%

X
- Definition The percentage of expected long term rate return during the reporting period. + References No definition available. + Details
Name: | cass_ExpectedLongTermRateReturn
Namespace Prefix: | cass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of long term rate of return allocation during the reporting period. + References No definition available. + Details
Name: | cass_LongTermRateOfReturnAllocation
Namespace Prefix: | cass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of long term rate of return assumption during the reporting period. + References No definition available. + Details
Name: | cass_LongTermRateOfReturnAssumption
Namespace Prefix: | cass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration