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Interest-Bearing Deposits (Schedule of Interest-bearing Deposits) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Interest-Bearing Deposits [Abstract]    
Interest-bearing demand deposits $ 354,511us-gaap_DemandDepositAccounts $ 316,743us-gaap_DemandDepositAccounts
Savings deposits 24,914us-gaap_DepositsSavingsDeposits 20us-gaap_DepositsSavingsDeposits
Time deposits:    
Less than $100 6,956us-gaap_TimeDepositsLessThan100000 7,777us-gaap_TimeDepositsLessThan100000
$100 or more 72,819us-gaap_TimeDeposits100000OrMore 91,219us-gaap_TimeDeposits100000OrMore
Total $ 459,200us-gaap_InterestBearingDepositLiabilities $ 438,655us-gaap_InterestBearingDepositLiabilities
Weighted Average Interest Rate Interest-bearing demand deposits 0.49%us-gaap_WeightedAverageRateDomesticDepositDemand 0.61%us-gaap_WeightedAverageRateDomesticDepositDemand
Weighted Average Interest Rate Savings deposits 0.51%us-gaap_WeightedAverageRateDomesticDepositSavings 0.66%us-gaap_WeightedAverageRateDomesticDepositSavings
Weighted Average Interest Rate Less than $100 1.14%cass_WeighteDaverageInterestRateOfTimeDepositsLessThan100000 1.09%cass_WeighteDaverageInterestRateOfTimeDepositsLessThan100000
Weighted Average Interest Rate $100 or more 0.79%us-gaap_WeightedAverageInterestRateOfTimeDeposits100000OrMore 0.81%us-gaap_WeightedAverageInterestRateOfTimeDeposits100000OrMore
Weighted Average Interest Rate Total 0.58%cass_WeightedAverageInterestRateOfInterestBearingDeposits 0.69%cass_WeightedAverageInterestRateOfInterestBearingDeposits