XML 121 R58.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Loans (Schedule of the Credit Exposure of the Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | $ 772,638 | $ 721,587
Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 767,714 | 718,439
Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] | 4,924 | 3,148
Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 323,857 | 277,091
Commercial and Industrial [Member] | Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 321,554 | 275,308
Commercial and Industrial [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] | 2,303 | 1,783
Commercial and Industrial [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Real Estate Commercial Mortgage [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 101,654 | 95,605
Real Estate Commercial Mortgage [Member] | Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 100,346 | 95,447
Real Estate Commercial Mortgage [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] | 1,308 | 158
Real Estate Commercial Mortgage [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Real Estate Commercial Construction [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 25,299 | 11,858
Real Estate Commercial Construction [Member] | Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 25,299 | 11,858
Real Estate Commercial Construction [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Real Estate Church Related Construction [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Real Estate Faith based Mortgage [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 305,826 | 316,147
Real Estate Faith based Mortgage [Member] | Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 304,513 | 314,940
Real Estate Faith based Mortgage [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] | 1,313 | 1,207
Real Estate Faith based Mortgage [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Real Estate Faith-based Construction [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 15,945 | 20,576
Real Estate Faith-based Construction [Member] | Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 15,945 | 20,576
Real Estate Faith-based Construction [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Real Estate Faith-based Construction [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Other [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans |  | 57 | 310
Other [Member] | Loans Subject To Normal Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | 57 | 310
Other [Member] | Performing Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
Other [Member] | Nonperforming Loans Subject To Special Monitoring [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [2] |  |
[1] | Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
[2] | Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of financing receivable, classified as current. Includes, but is not limited to, notes and loan receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 + Details
Name: | us-gaap_NotesAndLoansReceivableNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | cass_CreditExposureOfLoanPortfolioAxis=cass_LoansSubjectToNormalMonitoringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cass_CreditExposureOfLoanPortfolioAxis=cass_PerformingLoansSubjectToSpecialMonitoringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cass_CreditExposureOfLoanPortfolioAxis=cass_NonperformingLoansSubjectToSpecialMonitoringMember
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_RealEstateCommercialConstructionLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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