Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 07, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Entity Registrant Name	HALLMARK FINANCIAL SERVICES INC
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		18,123,093
Entity Central Index Key	0000819913
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Amendment Flag	false