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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Statutory federal tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Net operating loss carryforward $ 255,000us-gaap_OperatingLossCarryforwards [1] $ 298,000us-gaap_OperatingLossCarryforwards [1]  
Amounts of tax benefits that would affect effective tax rate if recognized 819,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 861,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,357,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Income tax accrued interest 45,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 41,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 89,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Increase (reduction) in accrued interest 4,000cass_IncreaseDecreaseInAccruedInterestResultingFromSettlementsWithTaxingAuthoritiesAndOtherPriorYearAdjustments (48,000)cass_IncreaseDecreaseInAccruedInterestResultingFromSettlementsWithTaxingAuthoritiesAndOtherPriorYearAdjustments  
Reduction of tax benefits over the next twelve months 210,000cass_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsOver12Months    
Franklin Bancorp [Member]      
Income Taxes [Line Items]      
Net operating loss carryforward 729,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= cass_FranklinBancorpMember
   
Limitations on use $ 122,000cass_NetOperatingLossCarryforwardsLimitationsOnUse
/ us-gaap_BusinessAcquisitionAxis
= cass_FranklinBancorpMember
   
Net operating loss carryforward expiration date Dec. 31, 2020    
[1] As of December 31, 2014, the Company had approximately $729,000 of net operating loss carry forwards as a result of the acquisition of Franklin Bancorp. The utilization of the net operating loss carry forward is subject to Section 382 of the Internal Revenue Code and limits the Company's use to approximately $122,000 per year during the carry forward period, which expires in 2020.