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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 | $ 668,858 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue | $ 649,946 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
30-59 Days |  | 434 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
60-89 Days |  |
90 Days and over |  |
Non Accrual | 488 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 1,797 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Loans | 669,346 us-gaap_NotesAndLoansReceivableNetCurrent | 652,177 us-gaap_NotesAndLoansReceivableNetCurrent
Commercial and Industrial [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current | 203,350 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | 171,293 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
30-59 Days |  |
60-89 Days |  |
90 Days and over |  |
Non Accrual |  | 11 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Loans | 203,350 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember | 171,304 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Real Estate Commercial Mortgage [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current | 117,393 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | 127,879 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
30-59 Days |  |
60-89 Days |  |
90 Days and over |  |
Non Accrual | 361 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | 479 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Loans | 117,754 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember | 128,358 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Real Estate Commercial Construction [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current |  | 6,632 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialConstructionLoanMember
30-59 Days |  |
60-89 Days |  |
90 Days and over |  |
Non Accrual |  |
Loans |  | 6,632 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialConstructionLoanMember
Real Estate Church Related Mortgage [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current | 305,760 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | 325,091 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
30-59 Days |  | 434 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
60-89 Days |  |
90 Days and over |  |
Non Accrual | 127 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember | 1,307 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
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 Construction [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current | 18,612 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember | 9,817 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember
30-59 Days |  |
60-89 Days |  |
90 Days and over |  |
Non Accrual |  |
Loans | 18,612 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember | 9,817 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember
Industrial Revenue Bond [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current | 23,348 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember | 9,167 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember
30-59 Days |  |
60-89 Days |  |
90 Days and over |  |
Non Accrual |  |
Loans | 23,348 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember | 9,167 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember
Other [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Current | 395 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember | 67 us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember
30-59 Days |  |
60-89 Days |  |
90 Days and over |  |
Non Accrual |  |
Loans | $ 395 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember | $ 67 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember

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- Definition Financing receivables that are less than 30 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + 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 An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4531-111522 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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