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Loans (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Loans [Abstract] |  |  |
Impaired loans, allowance for loan losses | $ 127,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance | $ 318,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Nonaccrual loans | 488,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest | 1,797,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest |
Delinquent loans still accruing interest | 0 us-gaap_LoansAndLeasesReceivableImpairedNonperformingAccrualOfInterest | 0 us-gaap_LoansAndLeasesReceivableImpairedNonperformingAccrualOfInterest |
Loans classified as troubled debt restructuring |  |  |
Average balance of impaired loans | 1,262,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 1,381,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 5,451,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Income recognized on nonaccrual loans under original terms of contract | 108,000 cass_IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract | 180,000 cass_IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract | 381,000 cass_IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract
Income recognized on nonaccrual loans | 77,000 cass_IncomeRecognizedOnNonaccrualLoans | 131,000 cass_IncomeRecognizedOnNonaccrualLoans | 141,000 cass_IncomeRecognizedOnNonaccrualLoans
Foreclosed loans value |  |  |

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- Definition Amount of income recognized on nonaccrual loans. + References No definition available. + Details
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- Definition Amount of income recognized on nonaccrual loans under original term of contracts. + References No definition available. + Details
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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 Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued. + References No definition available. + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + 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 (a) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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- Details
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