v3.22.2.2
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2022
Nov. 14, 2022
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2022  
Entity File Number 001-11252  
Entity Registrant Name Hallmark Financial Services, Inc.  
Entity Incorporation, State or Country Code NV  
Entity Tax Identification Number 87-0447375  
Entity Address, Address Line One 5420 Lyndon B. Johnson Freeway, Suite 1100  
Entity Address, City or Town Dallas  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75240  
City Area Code 817  
Local Phone Number 348-1600  
Title of 12(b) Security Common Stock, $0.18 par value  
Trading Symbol HALL  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   18,184,824
Entity Central Index Key 0000819913  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false