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Condensed Financial Information of Parent Company (Schedule of Condensed Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 11,307us-gaap_CashAndDueFromBanks	$ 11,283us-gaap_CashAndDueFromBanks
Securities available-for-sale, at fair value	356,141us-gaap_AvailableForSaleSecurities	317,767us-gaap_AvailableForSaleSecurities
Loans, net	657,452us-gaap_LoansAndLeasesReceivableNetReportedAmount	640,498us-gaap_LoansAndLeasesReceivableNetReportedAmount
Premises and equipment, net	16,909us-gaap_PropertyPlantAndEquipmentNet	13,231us-gaap_PropertyPlantAndEquipmentNet
Other assets	25,886us-gaap_OtherAssets	21,363us-gaap_OtherAssets
Total assets	1,500,731us-gaap_Assets	1,326,020us-gaap_Assets	1,287,387us-gaap_Assets
Liabilities and Shareholders' Equity
Accounts and drafts payable	655,428cass_AccountsAndDraftsPayable	543,953cass_AccountsAndDraftsPayable
Other liabilities	26,672us-gaap_OtherLiabilities	9,144us-gaap_OtherLiabilities
Total liabilities	1,300,299us-gaap_Liabilities	1,135,593us-gaap_Liabilities
Total shareholders equity	200,432us-gaap_StockholdersEquity	190,427us-gaap_StockholdersEquity	174,015us-gaap_StockholdersEquity	160,548us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	1,500,731us-gaap_LiabilitiesAndStockholdersEquity	1,326,020us-gaap_LiabilitiesAndStockholdersEquity
Parent [Member]
Assets
Cash and due from banks	32,399us-gaap_CashAndDueFromBanks / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	24,519us-gaap_CashAndDueFromBanks / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Short-term investments	107,932us-gaap_OtherShortTermInvestments / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	63,063us-gaap_OtherShortTermInvestments / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Securities available-for-sale, at fair value	356,141us-gaap_AvailableForSaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	317,767us-gaap_AvailableForSaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Loans, net	115,958us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	125,316us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Investments in subsidiaries	82,688us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	76,500us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Premises and equipment, net	16,030us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	12,276us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Other assets	166,235us-gaap_OtherAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	120,438us-gaap_OtherAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total assets	877,383us-gaap_Assets / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	739,879us-gaap_Assets / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Liabilities and Shareholders' Equity
Accounts and drafts payable	655,358cass_AccountsAndDraftsPayable / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	543,953cass_AccountsAndDraftsPayable / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Other liabilities	21,511us-gaap_OtherLiabilities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	5,521us-gaap_OtherLiabilities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total liabilities	676,869us-gaap_Liabilities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	549,474us-gaap_Liabilities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total shareholders equity	200,514us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	190,405us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total liabilities and shareholders' equity	$ 877,383us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	$ 739,879us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember

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