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Subsequent Events (Details) - Subsequent Event [Member]	1 Months Ended
	Oct. 23, 2018 $ / shares shares
Percentage of common stock dividend payable	20.00%
Dividend per share | $ / shares	$ 0.26
Date of dividend payable	Dec. 14, 2018
Additional share of common stock received on unit | shares	500,000

X

- Definition

Additional share of common stock received on per unit.

+ References

No definition available.

+ Details

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Namespace Prefix:	cass_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percentage of common stock dividend payable.

+ References

No definition available.

+ Details

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Namespace Prefix:	cass_
Data Type:	num:percentItemType
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Period Type:	duration

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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X

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Details

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