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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 30, 2019
Document and Entity Information [Abstract]      
Document Type 10-K/A    
Amendment description EXPLANATORY NOTE Cass Information Systems, Inc. (the “Company”), filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (the “Original Filing”) with the United States Securities and Exchange Commission (the “SEC”) on February 28, 2020. Due to a filing error, certain revisions to the Original Filing were not reflected in the as-filed version of the Original Filing. The Company is filing this Amendment No. 1 to the Original Filing (“Amendment No. 1”) solely to reflect such revisions, which include, among other corrections, the following: (i) language variations in the description of certain of the factors that affected the Company’s fiscal 2019 results of operations included in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations”; (ii) a correction of an inadvertent error to the amount of unappropriated retained earnings available to the Company’s banking subsidiary for the declaration of dividends disclosed in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 2 to the consolidated financial statements; and (iii) corrections to inadvertent errors in footing the total net cash provided by operating activities for the year ended December 31, 2019 as reflected in the Company’s consolidated statements of cash flows. In addition, the exhibit list included in Item 15 of Part IV has been amended to contain a currently-dated consent of KPMG LLP and, pursuant to the rules of the SEC, currently-dated certifications from the Company’s Principal Executive Officer and Principal Financial Officer, as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. Such consent and the certifications of the Company’s Principal Executive Officer and Principal Financial Officer are attached as exhibits to this Amendment No. 1. Except as described above, this Amendment No. 1 speaks as of the original filing date of the Original Filing and does not amend or update any other information contained in the Original Filing to reflect events that may have occurred subsequent to the original filing date. The Company has included a complete copy of the Original Filing, as amended per above, in this filing.    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Entity File Number 000-20827    
Entity Registrant Name CASS INFORMATION SYSTEMS, INC.    
Entity Incorporation, State or Country Code MO    
Entity Tax Identification Number 43-1265338    
Entity Address, Address Line One 12444 Powerscourt Drive    
Entity Address, Address Line Two Suite 550    
Entity Address, City or Town St. Louis    
Entity Address, State or Province MO    
Entity Address, Postal Zip Code 63131    
City Area Code 314    
Local Phone Number 506-5500    
Title of 12(b) Security Common Stock, par value $0.50 per share    
Trading Symbol CASS    
Name of Exchange on which Security is Registered NASDAQ    
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 702,445,000
Entity Common Stock, Shares Outstanding   14,552,402  
Documents Incorporated By Reference Text Block

Certain information required for Part III of this report is incorporated by reference to the Registrant’s Proxy Statement for the 2020 Annual Meeting of Shareholders.

   
Amendment Flag true    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000708781    
Current Fiscal Year End Date --12-31