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Commitments and Contingencies (Narrative) (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unused loan commitments	$ 91,117
Standby letters of credit	13,841
Commercial letters of credit	$ 3,184

X

- Definition

Standby letters of credit outstanding.

+ References

No definition available.

+ Details

Name:	cass_StandbyLettersOfCreditOutstanding
Namespace Prefix:	cass_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

Name:	us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant