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Disclosures about Fair Value of Financial Instruments (Summary of the Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Cash and cash equivalents, Carrying Amount	$ 294,335us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 225,262us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 141,088us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 235,962us-gaap_CashAndCashEquivalentsAtCarryingValue
Securities available-for-sale, at fair value	356,141us-gaap_AvailableForSaleSecurities	317,767us-gaap_AvailableForSaleSecurities
Loans, net, Carrying Amount	657,452us-gaap_LoansAndLeasesReceivableNetReportedAmount	640,498us-gaap_LoansAndLeasesReceivableNetReportedAmount
Accrued interest receivable, Carrying Amount	6,521us-gaap_InterestReceivable	6,030us-gaap_InterestReceivable
Assets, Carrying Amount	1,314,449cass_AssetsCarryingAmount	1,189,557cass_AssetsCarryingAmount
Cash and cash equivalents, Fair Value	294,335us-gaap_CashAndCashEquivalentsFairValueDisclosure	225,262us-gaap_CashAndCashEquivalentsFairValueDisclosure
Investment in securities, Fair Value	356,141us-gaap_InvestmentsFairValueDisclosure	317,767us-gaap_InvestmentsFairValueDisclosure
Loans, net, Fair Value	663,247us-gaap_LoansReceivableFairValueDisclosure	642,543us-gaap_LoansReceivableFairValueDisclosure
Accrued interest receivable, Fair Value	6,521us-gaap_AccountsReceivableFairValueDisclosure	6,030us-gaap_AccountsReceivableFairValueDisclosure
Assets, Fair Value	1,320,244us-gaap_AssetsFairValueDisclosure	1,191,602us-gaap_AssetsFairValueDisclosure
Deposits, Carrying Amount	618,199us-gaap_Deposits	582,496us-gaap_Deposits
Accounts and drafts payable, Carrying Amount	655,428cass_AccountsAndDraftsPayable	543,953cass_AccountsAndDraftsPayable
Accrued interest payable, Carrying Amount	57us-gaap_InterestPayableCurrentAndNoncurrent	88us-gaap_InterestPayableCurrentAndNoncurrent
Liabilities, Carrying Amount	1,273,684cass_LiabilitiesCarryingValue	1,126,537cass_LiabilitiesCarryingValue
Deposits, Fair Value	618,199us-gaap_DepositsFairValueDisclosure	583,989us-gaap_DepositsFairValueDisclosure
Accounts and drafts payable, Fair Value	655,428cass_AccountsAndDraftsPayableFairValueDisclosure	543,953cass_AccountsAndDraftsPayableFairValueDisclosure
Accrued interest payable, Fair Value	57us-gaap_AccruedLiabilitiesFairValueDisclosure	88us-gaap_AccruedLiabilitiesFairValueDisclosure
Liabilities, Fair Value	$ 1,273,684us-gaap_LiabilitiesFairValueDisclosure	$ 1,128,030us-gaap_LiabilitiesFairValueDisclosure

X

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business and includes carrying value of amounts due on drafts payable on the balance sheet date.

+ References

No definition available.

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of accounts and drafts payable existing as of the balance sheet date.

+ References

No definition available.

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X

- Definition

This element represents the aggregate of the assets reported at period end of carrying value.

+ References

No definition available.

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X

- Definition

This element represents the aggregate of the liabilities reported on the carrying value of the entity.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties.

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X

- Definition

Fair value portion of accrued expenses.

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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X

- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

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- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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- Definition

Fair value of financial and nonfinancial obligations.

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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