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v2.4.1.9

Loans (Schedule of the Credit Exposure of the Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | $ 669,346 us-gaap_NotesAndLoansReceivableNetCurrent |  | $ 652,177 us-gaap_NotesAndLoansReceivableNetCurrent |
Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 649,508 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember | [1] | 636,373 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember | [1]
Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 19,350 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember | [2] | 14,007 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember | [2]
Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 488 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember | [2] | 1,797 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember | [2]
Commercial and Industrial [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 203,350 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember |  | 171,304 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember |
Commercial and Industrial [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 199,837 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | [1] | 167,878 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | [1]
Commercial and Industrial [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 3,513 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | [2] | 3,415 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | [2]
Commercial and Industrial [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] | 11 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | [2]
Real Estate Commercial Mortgage [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 117,754 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember |  | 128,358 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember |
Real Estate Commercial Mortgage [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 103,097 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | [1] | 119,521 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | [1]
Real Estate Commercial Mortgage [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 14,296 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | [2] | 8,358 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | [2]
Real Estate Commercial Mortgage [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 361 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | [2] | 479 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | [2]
Real Estate Commercial Construction [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  |  | 6,632 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialConstructionLoanMember |
Real Estate Commercial Construction [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [1] | 6,632 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialConstructionLoanMember | [1]
Real Estate Commercial Construction [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Real Estate Commercial Construction [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Real Estate Church Related Mortgage [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 305,887 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember |  | 326,832 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember |
Real Estate Church Related Mortgage [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 304,219 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | [1] | 323,291 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | [1]
Real Estate Church Related Mortgage [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 1,541 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | [2] | 2,234 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_PerformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | [2]
Real Estate Church Related Mortgage [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 127 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | [2] | 1,307 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_NonperformingLoansSubjectToSpecialMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | [2]
Real Estate Church Related Construction [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 18,612 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember |  | 9,817 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember |
Real Estate Church Related Construction [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 18,612 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember | [1] | 9,817 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember | [1]
Real Estate Church Related Construction [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Real Estate Church Related Construction [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Industrial Revenue Bond [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 23,348 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember |  | 9,167 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember |
Industrial Revenue Bond [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 23,348 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember | [1] | 9,167 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember | [1]
Industrial Revenue Bond [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Industrial Revenue Bond [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Other [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 395 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember |  | 67 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember |
Other [Member] | Loans Subject To Normal Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans | 395 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember | [1] | 67 us-gaap_NotesAndLoansReceivableNetCurrent / cass_CreditExposureOfLoanPortfolioAxis = cass_LoansSubjectToNormalMonitoringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember | [1]
Other [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
Other [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Loans |  | [2] |  | [2]
[1] | Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
[2] | Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

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