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Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015
Percentage holding required to account investments under non-marketable equity investments	20.00%
Buildings [Member] | Maximum [Member]
Estimated useful lives	40 years
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful lives	10 years
Software, Equipment, Furniture and Fixtures [Member] | Minimum [Member]
Estimated useful lives	3 years
Software, Equipment, Furniture and Fixtures [Member] | Maximum [Member]
Estimated useful lives	7 years

X

- Definition

The percentage holding required to account investments under non-marketable equity investments.

+ References

No definition available.

+ Details

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Namespace Prefix:	cass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: