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v3.21.1

Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Fee revenue and other income: |  |
In-scope of FASB ASC 606 - Invoice processing fees | $ 19,064 | $ 19,124
In-scope of FASB ASC 606 - Invoice payment fees | 6,152 | 6,379
Information services payment and processing revenue | 25,216 | 25,503
Bank service fees | 494 | 410
Fee revenue (in-scope of FASB ASC 606) | 25,710 | 25,913
Other income (out-of-scope of FASB ASC 606) | 465 | 1,182
Total fee revenue and other income | $ 26,175 | $ 27,095

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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

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- 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