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Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cass Information Systems Inc. [Member]
Total capital (to risk-weighted assets), actual amount	$ 191,984	$ 175,802
Tier I capital (to risk-weighted assets), actual amount	181,198	164,729
Tier I capital (to average assets), actual amount	181,198	164,729
Total capital (to risk-weighted assets), actual ratio	22.27%	19.87%
Tier I capital (to risk-weighted assets), actual ratio	21.02%	18.62%
Tier I capital (to average assets), actual ratio	13.12%	12.26%
Total capital (to risk-weighted assets), capital requirements amount	68,956	70,767
Tier I capital (to risk-weighted assets), capital requirements amount	34,478	35,384
Tier I capital (to average assets), capital requirements amount	41,438	40,294
Total capital (to risk-weighted assets), capital requirements ratio	8.00%	8.00%
Tier I capital (to risk-weighted assets), capital requirements ratio	4.00%	4.00%
Tier I capital (to average assets), capital requirements ratio	3.00%	3.00%
Total capital (to risk-weighted assets), requirement to be well capitalized amount
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount
Tier I capital (to average assets), requirement to be well capitalized amount
Total capital (to risk-weighted assets), requirement to be well capitalized ratio
Tier I capital (to risk-weighted assets), requirement to be well capitalized ratio
Tier I capital (to average assets), requirement to be well capitalized ratio
Cass Commercial Bank [Member]
Total capital (to risk-weighted assets), actual amount	83,168	75,300
Tier I capital (to risk-weighted assets), actual amount	76,395	68,261
Tier I capital (to average assets), actual amount	76,395	68,261
Total capital (to risk-weighted assets), actual ratio	15.38%	13.41%
Tier I capital (to risk-weighted assets), actual ratio	14.13%	12.16%
Tier I capital (to average assets), actual ratio	11.37%	10.64%
Total capital (to risk-weighted assets), capital requirements amount	43,256	44,909
Tier I capital (to risk-weighted assets), capital requirements amount	21,628	22,454
Tier I capital (to average assets), capital requirements amount	20,162	19,238
Total capital (to risk-weighted assets), capital requirements ratio	8.00%	8.00%
Tier I capital (to risk-weighted assets), capital requirements ratio	4.00%	4.00%
Tier I capital (to average assets), capital requirements ratio	3.00%	3.00%
Total capital (to risk-weighted assets), requirement to be well capitalized amount	54,071	56,136
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount	32,442	33,682
Tier I capital (to average assets), requirement to be well capitalized amount	$ 33,603	$ 32,063
Total capital (to risk-weighted assets), requirement to be well capitalized ratio	10.00%	10.00%
Tier I capital (to risk-weighted assets), requirement to be well capitalized ratio	6.00%	6.00%
Tier I capital (to average assets), requirement to be well capitalized ratio	5.00%	5.00%

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The amount of total capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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