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Other Operating Expense (Schedule of Other Operating Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Operating Expense [Abstract]      
Postage and supplies $ 2,008us-gaap_SuppliesAndPostageExpense $ 2,066us-gaap_SuppliesAndPostageExpense $ 2,052us-gaap_SuppliesAndPostageExpense
Promotional expense 2,049us-gaap_MarketingAndAdvertisingExpense 2,024us-gaap_MarketingAndAdvertisingExpense 2,345us-gaap_MarketingAndAdvertisingExpense
Professional fees 1,566us-gaap_ProfessionalFees 1,340us-gaap_ProfessionalFees 2,183us-gaap_ProfessionalFees
Outside service fees 2,876cass_OutsideServiceFees 3,046cass_OutsideServiceFees 2,729cass_OutsideServiceFees
Data processing services 338us-gaap_InformationTechnologyAndDataProcessing 367us-gaap_InformationTechnologyAndDataProcessing 373us-gaap_InformationTechnologyAndDataProcessing
Telecommunications 1,045us-gaap_Communication 955us-gaap_Communication 754us-gaap_Communication
Other 1,647us-gaap_OtherExpenses 1,347us-gaap_OtherExpenses 1,080us-gaap_OtherExpenses
Total other operating expense $ 11,529us-gaap_OtherNoninterestExpense $ 11,145us-gaap_OtherNoninterestExpense $ 11,516us-gaap_OtherNoninterestExpense