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Loans (Schedule of Recorded Investment and Unpaid Principal for Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Participating Mortgage Loans [Line Items]    
Troubled debt restructurings still accruing      
Non Accrual 488us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 1,797us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Fair value of impaired loan 488us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
1,797us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
Upaid Principal Balance [Member]    
Participating Mortgage Loans [Line Items]    
Fair value of impaired loan 488us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
1,797us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
Related Allowance for Loan Losses [Member]    
Participating Mortgage Loans [Line Items]    
Fair value of impaired loan 127us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
318us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Non Accrual    11us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Commercial and Industrial [Member] | Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Non Accrual    11us-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]    
Non Accrual    11us-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]    
Non Accrual    6us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Non Accrual 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
479us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Real Estate Commercial Mortgage [Member] | Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Non Accrual 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
479us-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]    
Non Accrual 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
479us-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]    
Non Accrual    89us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Non Accrual 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
1,307us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Mortgage [Member] | Recorded Investment [Member]    
Participating Mortgage Loans [Line Items]    
Non Accrual 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_RecordedInvestmentMember
1,307us-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]    
Non Accrual 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= cass_UpaidPrincipalBalanceMember
1,307us-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]    
Non Accrual $ 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
$ 223us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember