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Condensed Financial Information of Parent Company (Schedule of Condensed Statement of Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income from subsidiaries: |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision |  |  |  |  |  |  |  |  | $ 37,299 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | $ 38,245 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | $ 40,385 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Gain on sales of investment securities |  |  |  |  |  |  |  |  | 23 us-gaap_GainLossOnSaleOfSecuritiesNet | 4,024 us-gaap_GainLossOnSaleOfSecuritiesNet | 2,635 us-gaap_GainLossOnSaleOfSecuritiesNet
Total net revenue |  |  |  |  |  |  |  |  | 117,206 us-gaap_Revenues | 114,817 us-gaap_Revenues | 111,523 us-gaap_Revenues
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 66,100 us-gaap_LaborAndRelatedExpense | 65,722 us-gaap_LaborAndRelatedExpense | 62,563 us-gaap_LaborAndRelatedExpense
Other expenses |  |  |  |  |  |  |  |  | 1,647 us-gaap_OtherExpenses | 1,347 us-gaap_OtherExpenses | 1,080 us-gaap_OtherExpenses
Total operating expense | 21,887 us-gaap_NoninterestExpense | 21,196 us-gaap_NoninterestExpense | 21,306 us-gaap_NoninterestExpense | 21,025 us-gaap_NoninterestExpense | 21,296 us-gaap_NoninterestExpense | 21,384 us-gaap_NoninterestExpense | 21,017 us-gaap_NoninterestExpense | 20,389 us-gaap_NoninterestExpense | 85,414 us-gaap_NoninterestExpense | 84,086 us-gaap_NoninterestExpense | 80,333 us-gaap_NoninterestExpense
Income tax expense | 1,902 us-gaap_IncomeTaxExpenseBenefit | 2,013 us-gaap_IncomeTaxExpenseBenefit | 1,958 us-gaap_IncomeTaxExpenseBenefit | 1,886 us-gaap_IncomeTaxExpenseBenefit | 1,582 us-gaap_IncomeTaxExpenseBenefit | 1,533 us-gaap_IncomeTaxExpenseBenefit | 2,106 us-gaap_IncomeTaxExpenseBenefit | 2,013 us-gaap_IncomeTaxExpenseBenefit | 7,759 us-gaap_IncomeTaxExpenseBenefit | 7,234 us-gaap_IncomeTaxExpenseBenefit | 7,887 us-gaap_IncomeTaxExpenseBenefit
Net income | 5,786 us-gaap_NetIncomeLoss | 6,401 us-gaap_NetIncomeLoss | 6,035 us-gaap_NetIncomeLoss | 5,811 us-gaap_NetIncomeLoss | 5,254 us-gaap_NetIncomeLoss | 6,138 us-gaap_NetIncomeLoss | 6,073 us-gaap_NetIncomeLoss | 6,032 us-gaap_NetIncomeLoss | 24,033 us-gaap_NetIncomeLoss | 23,497 us-gaap_NetIncomeLoss | 23,303 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income from subsidiaries: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 12 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 24 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Management fees |  |  |  |  |  |  |  |  | 2,058 us-gaap_ManagementFeesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,119 us-gaap_ManagementFeesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,955 us-gaap_ManagementFeesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income from subsidiaries |  |  |  |  |  |  |  |  | 2,070 us-gaap_InvestmentIncomeNonoperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,131 us-gaap_InvestmentIncomeNonoperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,979 us-gaap_InvestmentIncomeNonoperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Information services revenue |  |  |  |  |  |  |  |  | 77,064 us-gaap_TechnologyServicesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 70,503 us-gaap_TechnologyServicesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 66,417 us-gaap_TechnologyServicesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net interest income after provision |  |  |  |  |  |  |  |  | 14,986 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,069 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,563 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gain on sales of investment securities |  |  |  |  |  |  |  |  | 23 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,677 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,145 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income |  |  |  |  |  |  |  |  | 1,323 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 527 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 535 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total net revenue |  |  |  |  |  |  |  |  | 95,466 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 91,907 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89,639 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 59,885 us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 59,004 us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 55,981 us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses |  |  |  |  |  |  |  |  | 15,587 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,027 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,492 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expense |  |  |  |  |  |  |  |  | 75,472 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 74,031 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 70,473 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax and equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 19,994 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,876 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,166 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax expense |  |  |  |  |  |  |  |  | 3,125 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,381 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,914 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 16,869 us-gaap_IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,495 us-gaap_IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,252 us-gaap_IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 7,164 us-gaap_UndistributedEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,530 us-gaap_UndistributedEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,523 us-gaap_UndistributedEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany elimination |  |  |  |  |  |  |  |  |  | 472 cass_IntercompanyElimination / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (472)cass_IntercompanyElimination / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 24,033 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 23,497 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 23,303 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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