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