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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 15, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Registrant Name CSB BANCORP INC /OH    
Trading Symbol CSBB    
Entity Central Index Key 0000880417    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Title of 12(b) Security Common Shares, $6.25 par value    
Security Exchange Name NONE    
Entity Common Stock, Shares Outstanding   2,718,024  
Entity Public Float     $ 95.2
Entity File Number 0-21714    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 34-1687530    
Entity Address, Address Line One 91 North Clay Street    
Entity Address, City or Town Millersburg    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 44654    
City Area Code 330    
Local Phone Number 674-9015    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Auditor Firm ID 74    
Auditor Name S.R. Snodgrass, P.C.    
Auditor Location Cranberry Township, PA    
Documents Incorporated by Reference

Portions of CSB Bancorp Inc.’s Proxy Statement for the 2022 Annual Meeting of Shareholders are incorporated by reference in Part III of this Form 10-K.