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Loans (Summary of Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	$ 11,679us-gaap_LoansAndLeasesReceivableAllowance
Charge-Offs	79us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries	294us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Provision
Allowance for loan losses, Ending Balance	11,894us-gaap_LoansAndLeasesReceivableAllowance
Commercial and Industrial [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	3,139us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Charge-Offs
Recoveries	41us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Provision	335us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Allowance for loan losses, Ending Balance	3,515us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_CommercialAndIndustrialLoanMember
Real Estate Commercial Mortgage [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	3,064us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Charge-Offs
Recoveries	222us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Provision	(226)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Allowance for loan losses, Ending Balance	3,060us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateCommercialMortgageMember
Real Estate Commercial Construction [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance
Charge-Offs
Recoveries
Provision
Allowance for loan losses, Ending Balance
Real Estate Church Related Mortgage [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	4,375us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
Charge-Offs	76us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
Recoveries	30us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
Provision	(313)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
Allowance for loan losses, Ending Balance	4,016us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedMortgageMember
Real Estate Church Related Construction [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	124us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember
Charge-Offs
Recoveries
Provision	16us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember
Allowance for loan losses, Ending Balance	140us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_RealEstateChurchRelatedConstructionLoanMember
Industrial Revenue Bond [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	155us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember
Charge-Offs
Recoveries
Provision	239us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember
Allowance for loan losses, Ending Balance	394us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_IndustrialRevenueBondMember
Other [Member]
Participating Mortgage Loans [Line Items]
Allowance for loan losses, Beginning Balance	822us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember
Charge-Offs	3us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember
Recoveries	1us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember
Provision	(51)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember
Allowance for loan losses, Ending Balance	$ 769us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cass_OtherFinancingReceivableMember

X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

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-Publisher FASB

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-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 04

-Paragraph 11

-Article 9



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