Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 07, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	HALLMARK FINANCIAL SERVICES INC
Entity Central Index Key	0000819913
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Accelerated Filer
Trading Symbol	hall
Entity Common Stock, Shares Outstanding		18,058,676
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2018