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Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Fee revenue and other income: |  |  |  |  |
In-scope of FASB ASC 606 - Invoice processing fees |  | $ 20,408 | $ 19,876 | $ 61,397 | $ 58,492
In-scope of FASB ASC 606 - Invoice payment fees |  | 7,333 | 6,144 | 19,653 | 17,576
Information services payment and processing revenue |  | 27,741 | 26,020 | 81,050 | 76,068
Bank service fees |  | 307 | 300 | 984 | 994
Fee revenue (in-scope of FASB ASC 606) |  | 28,048 | 26,320 | 82,034 | 77,062
Other income (out-of-scope of FASB ASC 606) |  | 214 | 115 | 613 | 387
Total fee revenue and other income |  | 28,262 | 26,435 | 82,647 | 77,449
Net interest income after provision for loan losses (out-of-scope of FASB ASC 606) | [1] | 12,274 | 11,186 | 35,653 | 32,514
Total net revenue |  | $ 40,536 | $ 37,621 | $ 118,300 | $ 109,963
[1] | The Company earns interest income from the balances generated during the invoice processing and payment cycle and on deposit accounts, which is an integral component of the Company’s compensation for services provided, but is out-of-scope of FASB ASC 606.

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

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

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

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- Definition Net interest income after provision for loan losses classified as out-of-scope of FASB ASC 606. + References No definition available. + Details
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Namespace Prefix: | cass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Other income classified as out-of-scope of FASB ASC 606. + References No definition available. + Details
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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=116637391&loc=SL114874048-224260 + Details
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- References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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