XML 73 R55.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Loans (Schedule of Recorded Investment and Unpaid Principal for Impaired Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Non Accrual | $ 245 | $ 3,135
Recorded Investment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Fair value of impaired loan | 245 | 3,135
Upaid Principal Balance [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Fair value of impaired loan | 245 | 3,135
Related Allowance for Loan Losses [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Fair value of impaired loan |  | 1,142
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  |
Commercial and Industrial [Member] | Recorded Investment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  |
Commercial and Industrial [Member] | Upaid Principal Balance [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  |
Commercial and Industrial [Member] | Related Allowance for Loan Losses [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  |
Real Estate Commercial Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual | 245 | 3,032
Real Estate Commercial Mortgage [Member] | Recorded Investment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual | 245 | 3,032
Real Estate Commercial Mortgage [Member] | Upaid Principal Balance [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual | 245 | 3,032
Real Estate Commercial Mortgage [Member] | Related Allowance for Loan Losses [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  | 1,039
Real Estate Church Related Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  | 103
Real Estate Church Related Mortgage [Member] | Recorded Investment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  | 103
Real Estate Church Related Mortgage [Member] | Upaid Principal Balance [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  | 103
Real Estate Church Related Mortgage [Member] | Related Allowance for Loan Losses [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non Accrual |  | $ 103

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=cass_RecordedInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=cass_UpaidPrincipalBalanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForLoanAndLeaseLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cass_CommercialAndIndustrialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cass_RealEstateCommercialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cass_RealEstateChurchRelatedMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |