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Loans (Summary of Loan Categories) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Participating Mortgage Loans [Line Items]
Loans	$ 669,346us-gaap_NotesAndLoansReceivableNetCurrent	$ 652,177us-gaap_NotesAndLoansReceivableNetCurrent
Commercial and Industrial [Member]
Participating Mortgage Loans [Line Items]
Loans	203,350us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_CommercialAndIndustrialLoanMember	171,304us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_CommercialAndIndustrialLoanMember
Real Estate Commercial Mortgage [Member]
Participating Mortgage Loans [Line Items]
Loans	117,754us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateCommercialMortgageMember	128,358us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateCommercialMortgageMember
Real Estate Commercial Construction [Member]
Participating Mortgage Loans [Line Items]
Loans		6,632us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateCommercialConstructionLoanMember
Real Estate Church Related Mortgage [Member]
Participating Mortgage Loans [Line Items]
Loans	305,887us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateChurchRelatedMortgageMember	326,832us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Construction [Member]
Participating Mortgage Loans [Line Items]
Loans	18,612us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateChurchRelatedConstructionLoanMember	9,817us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_RealEstateChurchRelatedConstructionLoanMember
Industrial Revenue Bond [Member]
Participating Mortgage Loans [Line Items]
Loans	23,348us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_IndustrialRevenueBondMember	9,167us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_IndustrialRevenueBondMember
Other Loan [Member]
Participating Mortgage Loans [Line Items]
Loans	$ 395us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_OtherLoanMember	$ 67us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_FinancialInstrumentAxis = cass_OtherLoanMember

X

- 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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- Details

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- Details

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