XML 92 R42.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Loans by Type - Summary of ACL by Category (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 13,089 |
Ending balance | 13,634 |
Loans Excluding Unfunded Commitments |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 13,089 | $ 13,539
Provision for (release of) credit losses | 545 | (450)
Ending balance | 13,634 |
Loans Excluding Unfunded Commitments | C&I |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 5,412 | 5,978
Provision for (release of) credit losses | 502 | (566)
Ending balance | 5,914 |
Loans Excluding Unfunded Commitments | CRE |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 1,093 | 940
Provision for (release of) credit losses | 23 | 153
Ending balance | 1,116 |
Loans Excluding Unfunded Commitments | Faith-based CRE |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 6,476 | 6,437
Provision for (release of) credit losses | (11) | 39
Ending balance | 6,465 |
Loans Excluding Unfunded Commitments | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 108 | 184
Provision for (release of) credit losses | 31 | $ (76)
Ending balance | $ 139 |

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=cass_CAndIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=cass_CREMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=cass_FaithBasedCREMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |