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Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fee revenue and other income: |  |  |  |
In-scope of FASB ASC 606 - Invoice processing fees | $ 19,753 | $ 17,923 | $ 38,817 | $ 37,047
In-scope of FASB ASC 606 - Invoice payment fees | 6,595 | 4,738 | 12,747 | 11,117
Information services payment and processing revenue | 26,348 | 22,661 | 51,564 | 48,164
Bank service fees | 530 | 398 | 1,024 | 808
Fee revenue (in-scope of FASB ASC 606) | 26,878 | 23,059 | 52,588 | 48,972
Other income (out-of-scope of FASB ASC 606) | 109 | 115 | 574 | 1,297
Total fee revenue and other income | $ 26,987 | $ 23,174 | $ 53,162 | $ 50,269

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- Definition Bank service fees. + References No definition available. + Details
Name: | cass_BankServiceFees
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fee revenue classified as in-scope of FASB ASC 606. + References No definition available. + Details
Name: | cass_FeeRevenueInscopeFASBASC606
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue earned from providing services relating to transportation invoice rating, payment, audit, accounting and transportation information to many of the nation's largest companies. + References No definition available. + Details
Name: | cass_InformationServicesPaymentAndProcessingRevenue
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Invoice payment fees classified as in-scope of FASB ASC 606. + References No definition available. + Details
Name: | cass_InvoicePaymentFeesInscopeFASBASC606
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Invoice processing fees classified as in-scope of FASB ASC 606. + References No definition available. + Details
Name: | cass_InvoiceProcessingFeesInscopeFASBASC606
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other income classified as out-of-scope of FASB ASC 606. + References No definition available. + Details
Name: | cass_OtherIncomeOutofscopeFASBASC606
Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_NoninterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenuePerformanceObligationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration