XML 67 R41.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Loans by Type (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Loan Disclosure | Impaired loans consist primarily of nonaccrual loans, loans greater than 90 days past due and still accruing interest and troubled debt restructurings, both performing and nonperforming. Troubled debt restructuring involves the granting of a concession to a borrower experiencing financial difficulty resulting in the modification of terms of the loan, such as changes in payment schedule or interest rate. |
Accruing Interest On Nonrecurring Loan | $ 0 | $ 0
Loans Classified As Troubled Debt Restructuring | 0 | 0
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 1,322,000 | 1,322,000
Received From Nonaccrual Loan | 4,115,000 |
Nonperforming Loans Nonaccrual | 4,198,000 |
Nonaccrual Loan Charged Off | $ 83,000 |

X
- Definition The amount of interest accrued on non recurring loan during the reporting period. + References No definition available. + Details
Name: | cass_AccruingInterestOnNonrecurringLoan
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Disclosures related to loans. + References No definition available. + Details
Name: | cass_LoanDisclosure
Namespace Prefix: | cass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of loan classified as trouble debt restructuring during the reporting period. + References No definition available. + Details
Name: | cass_LoansClassifiedAsTroubledDebtRestructuring
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of nonaccrual loan charged off. + References No definition available. + Details
Name: | cass_NonaccrualLoanChargedOff
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of nonperforming loans nonaccrual as of the reporting date. + References No definition available. + Details
Name: | cass_NonperformingLoansNonaccrual
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of received for one nonaccrual loan. + References No definition available. + Details
Name: | cass_ReceivedFromNonaccrualLoan
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + 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 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 2, 3, 4 -IssueDate 2006-05-01 -Chapter 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_OtherRealEstateAndForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant