XML 80 R62.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Loans - Summary of ACL by Category (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Allowance for credit losses on loans: |  |
Beginning balance | $ 13,089,000 |
Ending balance | 13,395,000 | $ 13,089,000
Loans Excluding Unfunded Commitments |  |
Allowance for credit losses on loans: |  |
Beginning balance | 13,089,000 | 13,539,000
Provision for (release of) credit losses | 306,000 | (450,000)
Ending balance | 13,395,000 | 13,089,000
Unfunded Loan Commitment |  |
Allowance for credit losses on loans: |  |
Release of credit losses for unfunded commitments | (141,000) | (100,000)
C&I | Loans Excluding Unfunded Commitments |  |
Allowance for credit losses on loans: |  |
Beginning balance | 5,412,000 | 5,978,000
Provision for (release of) credit losses | 485,000 | (566,000)
Ending balance | 5,897,000 | 5,412,000
CRE | Loans Excluding Unfunded Commitments |  |
Allowance for credit losses on loans: |  |
Beginning balance | 1,093,000 | 940,000
Provision for (release of) credit losses | (70,000) | 153,000
Ending balance | 1,023,000 | 1,093,000
Faith-based CRE | Loans Excluding Unfunded Commitments |  |
Allowance for credit losses on loans: |  |
Beginning balance | 6,476,000 | 6,437,000
Provision for (release of) credit losses | (218,000) | 39,000
Ending balance | 6,258,000 | 6,476,000
Construction | Loans Excluding Unfunded Commitments |  |
Allowance for credit losses on loans: |  |
Beginning balance | 108,000 | 184,000
Provision for (release of) credit losses | 109,000 | (76,000)
Ending balance | $ 217,000 | $ 108,000

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 decrease in allowance for credit loss on financing receivable from writeoff. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
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: |