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Loans (Schedule of the Aging of Loans by Loan Categories) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Participating Mortgage Loans [Line Items]    
Current $ 668,858us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue $ 649,946us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
30-59 Days    434us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
60-89 Days      
90 Days and over      
Non Accrual 488us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 1,797us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Loans 669,346us-gaap_NotesAndLoansReceivableNetCurrent 652,177us-gaap_NotesAndLoansReceivableNetCurrent
Commercial and Industrial [Member]    
Participating Mortgage Loans [Line Items]    
Current 203,350us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
171,293us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
30-59 Days      
60-89 Days      
90 Days and over      
Non Accrual    11us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Loans 203,350us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
171,304us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_CommercialAndIndustrialLoanMember
Real Estate Commercial Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Current 117,393us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
127,879us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
30-59 Days     
60-89 Days      
90 Days and over      
Non Accrual 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
479us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Loans 117,754us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
128,358us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialMortgageMember
Real Estate Commercial Construction [Member]    
Participating Mortgage Loans [Line Items]    
Current    6,632us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialConstructionLoanMember
30-59 Days      
60-89 Days      
90 Days and over      
Non Accrual      
Loans    6,632us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateCommercialConstructionLoanMember
Real Estate Church Related Mortgage [Member]    
Participating Mortgage Loans [Line Items]    
Current 305,760us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
325,091us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
30-59 Days    434us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
60-89 Days      
90 Days and over      
Non Accrual 127us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
1,307us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Loans 305,887us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
326,832us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Construction [Member]    
Participating Mortgage Loans [Line Items]    
Current 18,612us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
9,817us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
30-59 Days      
60-89 Days      
90 Days and over      
Non Accrual      
Loans 18,612us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
9,817us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_RealEstateChurchRelatedConstructionLoanMember
Industrial Revenue Bond [Member]    
Participating Mortgage Loans [Line Items]    
Current 23,348us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
9,167us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
30-59 Days      
60-89 Days      
90 Days and over      
Non Accrual      
Loans 23,348us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
9,167us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_IndustrialRevenueBondMember
Other [Member]    
Participating Mortgage Loans [Line Items]    
Current 395us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember
67us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember
30-59 Days      
60-89 Days      
90 Days and over      
Non Accrual      
Loans $ 395us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember
$ 67us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cass_OtherFinancingReceivableMember