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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
Due within:    
One year $ 66,436us-gaap_TimeDepositMaturitiesYearOne $ 84,088us-gaap_TimeDepositMaturitiesYearOne
Two years 10,759us-gaap_TimeDepositMaturitiesYearTwo 12,690us-gaap_TimeDepositMaturitiesYearTwo
Three years 1,148us-gaap_TimeDepositMaturitiesYearThree 594us-gaap_TimeDepositMaturitiesYearThree
Four years 1,250us-gaap_TimeDepositMaturitiesYearFour 459us-gaap_TimeDepositMaturitiesYearFour
Five years 182us-gaap_TimeDepositMaturitiesYearFive 1,165us-gaap_TimeDepositMaturitiesYearFive
Total $ 79,775us-gaap_TimeDeposits $ 98,996us-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