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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 | 488 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 1,797 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Recorded Investment [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Fair value of impaired loan | 488 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_StatementScenarioAxis = cass_RecordedInvestmentMember | 1,797 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_StatementScenarioAxis = cass_RecordedInvestmentMember
Upaid Principal Balance [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Fair value of impaired loan | 488 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_StatementScenarioAxis = cass_UpaidPrincipalBalanceMember | 1,797 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_StatementScenarioAxis = cass_UpaidPrincipalBalanceMember
Related Allowance for Loan Losses [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Fair value of impaired loan | 127 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_StatementScenarioAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | 318 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_StatementScenarioAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember
Commercial and Industrial [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Non Accrual |  | 11 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Commercial and Industrial [Member] | Recorded Investment [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Non Accrual |  | 11 us-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 |  | 11 us-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 |  | 6 us-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 | 361 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | 479 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Real Estate Commercial Mortgage [Member] | Recorded Investment [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Non Accrual | 361 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember / us-gaap_StatementScenarioAxis = cass_RecordedInvestmentMember | 479 us-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 | 361 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember / us-gaap_StatementScenarioAxis = cass_UpaidPrincipalBalanceMember | 479 us-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 |  | 89 us-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 | 127 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | 1,307 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Mortgage [Member] | Recorded Investment [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Non Accrual | 127 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember / us-gaap_StatementScenarioAxis = cass_RecordedInvestmentMember | 1,307 us-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 | 127 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember / us-gaap_StatementScenarioAxis = cass_UpaidPrincipalBalanceMember | 1,307 us-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 | $ 127 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember / us-gaap_StatementScenarioAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | $ 223 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember / us-gaap_StatementScenarioAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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