Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Apr. 13, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 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, $1.00 par value
Trading Symbol	HALL
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
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 31.6
Entity Common Stock, Shares Outstanding		1,818,482
Entity Central Index Key	0000819913
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	This Amendment No. 1 (this “Amendment”) on Form 10-K/A is filed with respect to Hallmark Financial Services, Inc.’s  Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “Form 10-K”), filed with the Securities and Exchange Commission (the “SEC”) on March 28, 2023. This Amendment updates the Form 10- K, which omitted Part III (Items 10, 11, 12, 13 and 14) in reliance on General Instruction G(3) to Form 10-K, which provides that such information may be either incorporated by reference from the registrant’s definitive proxy statement or included in an amendment to Form 10-K, in either case filed with the SEC not later than 120 days after the end of the fiscal year. While we intend to file our preliminary proxy statement for our 2023 annual meeting of shareholders shortly, the timing of the filing of a definitive proxy statement will be outside this window for incorporation by reference.
Auditor Name	Baker Tilly US, LLP
Auditor Firm ID	23
Auditor Location	Madison, Wisconsin