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Unused Available Lines of Credit (Details) (USD $)
Dec. 31, 2014
Unsecured Debt [Member]  
Line of credit amount $ 88,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | US Bank [Member]  
Line of credit amount 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_UsBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | Wells Fargo Bank [Member]  
Line of credit amount 15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_WellsFargoBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | PNC Bank [Member]  
Line of credit amount 12,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_PncBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | Frost National Bank [Member]  
Line of credit amount 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_FrostNationalBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | JPM Chase Bank [Member]  
Line of credit amount 6,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_JpmChaseBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | UMB Bank [Member]  
Line of credit amount 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_UmbBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | Bank Of America [Member]  
Line of credit amount 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_BankOfAmericaMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Secured Debt [Member] | UMB Bank [Member]  
Line of credit amount 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_UmbBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Secured Debt [Member] | Federal Home Loan Bank [Member]  
Line of credit amount 158,247,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_FederalHomeLoanBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Secured Debt [Member] | First Tennessee Bank [Member]  
Line of credit amount $ 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= cass_FirstTennesseeBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember