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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 08, 2020
Jun. 30, 2019
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-25045    
Entity Registrant Name CENTRAL FEDERAL CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 34-1877137    
Entity Address, Address Line One 7000 N. High Street    
Entity Address, City or Town Worthington    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 43085    
City Area Code 614    
Local Phone Number 334-7979    
Title of 12(b) Security Common Stock, par value $.01 per share    
Trading Symbol cfbk    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 53.8
Entity Common Stock, Shares Outstanding   5,373,858  
Documents Incorporated By Reference
Portions of the registrant’s Annual Report to Stockholders  for its fiscal year ended December 31, 2019,  included as Exhibit 13.1 to this Form 10-K, and its Proxy Statement for the Annual Meeting of Stockholders  to be held on May 27, 2020,  are incorporated herein by reference into Parts II and III, respectively, of this Form 10-K.
   
Amendment Flag false    
Entity Central Index Key 0001070680    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY