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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended
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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 | $ 255,000 us-gaap_OperatingLossCarryforwards | [1] | $ 298,000 us-gaap_OperatingLossCarryforwards | [1] |
Amounts of tax benefits that would affect effective tax rate if recognized | 819,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  | 861,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  | 1,357,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Income tax accrued interest | 45,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  | 41,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  | 89,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Increase (reduction) in accrued interest | 4,000 cass_IncreaseDecreaseInAccruedInterestResultingFromSettlementsWithTaxingAuthoritiesAndOtherPriorYearAdjustments |  | (48,000)cass_IncreaseDecreaseInAccruedInterestResultingFromSettlementsWithTaxingAuthoritiesAndOtherPriorYearAdjustments |  |
Reduction of tax benefits over the next twelve months | 210,000 cass_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsOver12Months |  |  |  |
Franklin Bancorp [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforward | 729,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = cass_FranklinBancorpMember |  |  |  |
Limitations on use | $ 122,000 cass_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.

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- Definition The amount of increase (reduction) in accrued interest resulting from settlements with taxing authorities and other prior year adjustments. + References No definition available. + Details
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- Definition Net operating loss carryforwards, limitations on use. + References No definition available. + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations over twelve months. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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