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Employee Benefit Plans (Schedule of Long-term Rate of Return on Assets (Details) | 12 Months Ended
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Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |
Assumed long-term rate of return on assets | 6.75%cass_ExpectedLongTermRateReturn
Fixed Income [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 49.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember
One-Year Nominal Return | 4.79%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember
Annual Standard Deviation | 4.68%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember
U.S. Equity [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 34.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember
Large Cap U.S. Growth Equities |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 9.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_UnitedStatesLargeCapGrowthMember
One-Year Nominal Return | 8.42%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_UnitedStatesLargeCapGrowthMember
Annual Standard Deviation | 19.20%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_UnitedStatesLargeCapGrowthMember
Large Cap U.S. Value Equities |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 9.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_UnitedStatesLargeCapValueMember
One-Year Nominal Return | 7.53%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_UnitedStatesLargeCapValueMember
Annual Standard Deviation | 16.73%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_UnitedStatesLargeCapValueMember
Large Cap U.S. Equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 9.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_EquitySecuritiesLargeCapMember
One-Year Nominal Return | 7.67%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_EquitySecuritiesLargeCapMember
Annual Standard Deviation | 16.65%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_EquitySecuritiesLargeCapMember
Small Cap U.S. Equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 8.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_EquitySecuritiesSmallCapMember
One-Year Nominal Return | 8.70%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_EquitySecuritiesSmallCapMember
Annual Standard Deviation | 20.53%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_EquitySecuritiesSmallCapMember
Non-U.S. Equity [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 16.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesMember
International (Developed) [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesDevelopedMember
One-Year Nominal Return | 8.98%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesDevelopedMember
Annual Standard Deviation | 19.79%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesDevelopedMember
International (Emerging) [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Target Plan Asset Allocations | 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesEmergingMember
One-Year Nominal Return | 10.77%cass_OneYearNominalReturn / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesEmergingMember
Annual Standard Deviation | 28.45%cass_AnnualStandardDeviation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cass_ForeignEquitySecuritiesEmergingMember

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- Definition The expected percentage of annual standard deviation on assets. + References No definition available. + Details
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- Definition The percentage of expected long term rate return during the reporting period. + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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