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Interest-Bearing Deposits (Schedule of Maturities of Time Deposits) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Due within: |  |
One year | $ 66,436 us-gaap_TimeDepositMaturitiesYearOne | $ 84,088 us-gaap_TimeDepositMaturitiesYearOne
Two years | 10,759 us-gaap_TimeDepositMaturitiesYearTwo | 12,690 us-gaap_TimeDepositMaturitiesYearTwo
Three years | 1,148 us-gaap_TimeDepositMaturitiesYearThree | 594 us-gaap_TimeDepositMaturitiesYearThree
Four years | 1,250 us-gaap_TimeDepositMaturitiesYearFour | 459 us-gaap_TimeDepositMaturitiesYearFour
Five years | 182 us-gaap_TimeDepositMaturitiesYearFive | 1,165 us-gaap_TimeDepositMaturitiesYearFive
Total | $ 79,775 us-gaap_TimeDeposits | $ 98,996 us-gaap_TimeDeposits
Percent of Total One year | 83.30%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearOne | 84.90%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearOne
Percent of Total Two years | 13.50%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo | 12.80%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo
Percent of Total Three years | 1.40%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearThree | 0.60%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearThree
Percent of Total Four years | 1.60%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearFour | 0.50%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearFour
Percent Of Toal Five years | 0.20%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearFive | 1.20%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearFive
Total | 100.00%cass_TimeDepositsWeightedAverageInterestRateAggregate | 100.00%cass_TimeDepositsWeightedAverageInterestRateAggregate

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- Definition Aggregate percentage of weighted average interest rate for time deposits held by the entity with maturities from one to five years. + References No definition available. + Details
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- Definition Amount of time deposits maturing in the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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X
- Definition Amount of time deposits maturing in the fourth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Details
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- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than four years, but five years or less. + References No definition available. + Details
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- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than three years, but four years or less. + References No definition available. + Details
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- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than two years, but three years or less. + References No definition available. + Details
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