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Capital Requirements and Regulatory Restrictions (Tables)

12 Months Ended

Dec. 31, 2018

Regulatory Capital Requirements [Abstract]

Schedule of Capital Amounts and Ratios

The Company’s and the Bank’s actual and required capital amounts and ratios are as follows:

								Capital						Requirement to be
		Actual						Requirements						Well-Capitalized
(In thousands)		Amount Ratio						Amount Ratio						Amount Ratio
At December 31, 2018
Total capital (to risk-weighted assets)
Cass Information Systems, Inc.		$	244,660		21.38	%		$	91,550		8.00	%		$	N/A		N/A	%
Cass Commercial Bank			137,894		18.31				60,257		8.00				75,321		10.00
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc.			234,435		20.49				51,497		4.50				N/A		N/A
Cass Commercial Bank			130,037		17.26				33,895		4.50				48,959		6.50
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc.			234,435		20.49				68,662		6.00				N/A		N/A
Cass Commercial Bank			130,037		17.26				45,193		6.00				60,257		8.00
Tier I capital (to average assets)
Cass Information Systems, Inc.			234,435		13.89				67,500		4.00				N/A		N/A
Cass Commercial Bank			130,037		15.35				33,884		4.00				42,354		5.00
At December 31, 2017
Total capital (to risk-weighted assets)
Cass Information Systems, Inc.		$	234,389		22.53	%		$	83,233		8.00	%		$	N/A		N/A	%
Cass Commercial Bank			122,440		17.01				57,568		8.00				71,960		10.00
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc.			224,184		21.55				46,819		4.50				N/A		N/A
Cass Commercial Bank			114,603		15.93				32,382		4.50				46,774		6.50
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc.			224,184		21.55				62,425		6.00				N/A		N/A
Cass Commercial Bank			114,603		15.93				43,176		6.00				57,568		8.00
Tier I capital (to average assets)
Cass Information Systems, Inc.			224,184		13.87				64,649		4.00				N/A		N/A
Cass Commercial Bank			114,603		14.99				30,581		4.00				38,227		5.00

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- References

No definition available.

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- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

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