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Capital Requirements and Regulatory Restrictions (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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 |
At December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. |  | $ | 219,747 |  | 22.75 | % |  | $ | 77,272 |  | 8.00 | % |  | $ | N/A |  | N/A | %
Cass Commercial Bank |  |  | 110,576 |  | 16.72 |  |  |  | 52,898 |  | 8.00 |  |  |  | 66,123 |  | 10.00 |
Common Equity Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. |  |  | 209,572 |  | 21.70 |  |  |  | 43,466 |  | 4.50 |  |  |  | N/A |  | N/A |
Cass Commercial Bank |  |  | 102,769 |  | 15.54 |  |  |  | 29,755 |  | 4.50 |  |  |  | 42,980 |  | 6.50 |
Tier I capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. |  |  | 209,572 |  | 21.70 |  |  |  | 57,954 |  | 6.00 |  |  |  | N/A |  | N/A |
Cass Commercial Bank |  |  | 102,769 |  | 15.54 |  |  |  | 39,674 |  | 6.00 |  |  |  | 52,898 |  | 8.00 |
Tier I capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cass Information Systems, Inc. |  |  | 209,572 |  | 13.83 |  |  |  | 60,620 |  | 4.00 |  |  |  | N/A |  | N/A |
Cass Commercial Bank |  |  | 102,769 |  | 13.98 |  |  |  | 29,409 |  | 4.00 |  |  |  | 36,761 |  | 5.00

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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