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Loans by Type (Schedule of Recorded Investment and Unpaid Principal for Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Participating Mortgage Loans [Line Items]    
Nonaccrual $ 3,286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 488us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 3,286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember		 488us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
Upaid Principal Balance [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 3,286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember		 488us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
Related Allowance for Loan Losses [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 1,248us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember		 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 88us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember		   
Commercial and Industrial [Member] | Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 88us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember		   
Commercial and Industrial [Member] | Upaid Principal Balance [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 88us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember		   
Commercial and Industrial [Member] | Related Allowance for Loan Losses [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual      
Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 3,077us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember		 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Real Estate Commercial Mortgage [Member] | Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 3,077us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember		 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
Real Estate Commercial Mortgage [Member] | Upaid Principal Balance [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 3,077us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember		 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
Real Estate Commercial Mortgage [Member] | Related Allowance for Loan Losses [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 1,127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember		   
Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 121us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember		 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Mortgage [Member] | Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 121us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember		 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
Real Estate Church Related Mortgage [Member] | Upaid Principal Balance [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual 121us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember		 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
Real Estate Church Related Mortgage [Member] | Related Allowance for Loan Losses [Member]    
Participating Mortgage Loans [Line Items]    
Nonaccrual $ 121us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember		 $ 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember