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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
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Interest-Bearing Deposits [Abstract] |  |
Interest-bearing demand deposits | $ 354,511 us-gaap_DemandDepositAccounts | $ 316,743 us-gaap_DemandDepositAccounts
Savings deposits | 24,914 us-gaap_DepositsSavingsDeposits | 20 us-gaap_DepositsSavingsDeposits
Time deposits: |  |
Less than $100 | 6,956 us-gaap_TimeDepositsLessThan100000 | 7,777 us-gaap_TimeDepositsLessThan100000
$100 or more | 72,819 us-gaap_TimeDeposits100000OrMore | 91,219 us-gaap_TimeDeposits100000OrMore
Total | $ 459,200 us-gaap_InterestBearingDepositLiabilities | $ 438,655 us-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

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- Definition The weighted average interest rate of interest bearing deposits. + References No definition available. + Details
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- Definition The weighted average interest rate of all domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations less than $100,000 at the balance sheet date. + References No definition available. + Details
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- Definition The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice. + 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 + Details
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- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + 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 + Details
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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + 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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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph A -Subparagraph 4 + Details
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- Definition The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to less than $100,000. + References No definition available. + Details
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- Definition The weighted average interest rate of all domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more, at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph A -Subparagraph 4 + Details
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- Definition The weighted average interest rate for domestic demand deposit liabilities. + References No definition available. + Details
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- Definition The weighted average interest rate for domestic savings deposit liabilities. + References No definition available. + Details
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