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Disclosures about Fair Value of Financial Instruments (Schedule of Commitments to Extend Credit, Standby Letters of Credit and Commercial Letters) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments To Extend Credit [Member]    
Long-term Line of Credit $ 19,066us-gaap_LineOfCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
$ 5,596us-gaap_LineOfCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters Of Credit [Member]    
Long-term Line of Credit 12,693us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
13,168us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
Commercial Letters Of Credit [Member]    
Long-term Line of Credit $ 2,571us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= cass_CommercialLettersOfCreditMember
$ 3,325us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= cass_CommercialLettersOfCreditMember