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Loans by Type (Summary of Allowance for Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Participating Mortgage Loans [Line Items]  
Beginning Balance $ 11,894us-gaap_LoansAndLeasesReceivableAllowance
Charge-Offs   
Recoveries 4us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Provision   
Ending Balance 11,898us-gaap_LoansAndLeasesReceivableAllowance
Commercial and Industrial [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance 3,515us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Charge-Offs   
Recoveries 3us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Provision 323us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Ending Balance 3,841us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Real Estate Commercial Mortgage [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance 3,060us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Charge-Offs   
Recoveries   
Provision (152)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Ending Balance 2,908us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Real Estate Commercial Construction [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance   
Charge-Offs   
Recoveries   
Provision   
Ending Balance   
Real Estate Church Related Mortgage [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance 4,016us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Charge-Offs   
Recoveries 1us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Provision 56us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Ending Balance 4,073us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Construction [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance 140us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
Charge-Offs   
Recoveries   
Provision (17)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
Ending Balance 123us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
Industrial Revenue Bond [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance 394us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
Charge-Offs   
Recoveries   
Provision (13)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
Ending Balance 381us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
Other [Member]  
Participating Mortgage Loans [Line Items]  
Beginning Balance 769us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember
Charge-Offs   
Recoveries   
Provision (197)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember
Ending Balance $ 572us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember