Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Apr. 01, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity, Registrant Name	Summit Financial Group, Inc.
Current Fiscal Year End Date	--12-31
Document, Fiscal Period Focus	FY
Document, Fiscal Year Focus	2023
Document, Type	10-K/A
Document, Annual Report	true
Document, Transition Report	false
Document, Period End Date	Dec. 31, 2023
Entity, File Number	0-16587
Entity, Incorporation, State or Country Code	WV
Entity, Tax Identification Number	55-0672148
Entity, Address, Address Line One	300 N. Main Street
Entity, Address, City or Town	Moorefield
Entity, Address, State or Province	WV
Entity, Address, Postal Zip Code	26836
City Area Code	304
Local Phone Number	530-1000
Title of 12(b) Security	Common
Trading Symbol	SMMF
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	Accelerated Filer
Entity, Small Business	false
Entity, Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document, Financial Statement Error Correction Flag	false
Entity, Shell Company	false
Entity, Public Float			$ 265,527,000
Entity, Common Stock Shares, Outstanding		14,686,738
Amendment Description	On March 12, 2024, Summit Financial Group, Inc. (the “Company”, “we”, or “us”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the Original Form 10-K). Certain Part III information was omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K. General Instruction G(3) to Form 10-K provides that registrants may incorporate by reference certain information from a definitive proxy statement which involves the election of directors if such definitive proxy statement is filed with the Securities and Exchange Commission (the SEC) within 120 days after the end of the fiscal year. We are filing this Amendment No. 1 (this Amendment) to include Part III information in the Original Form 10-K because we do not expect to file a definitive proxy statement containing this information within 120 days after the end of the fiscal year covered by the Original Form 10-K. Accordingly, this Amendment hereby amends and restates Part III, Items 10 through 14, of the Original Form 10-K as set forth below.   This Amendment also restates Item 15 of Part IV of the Original Form 10-K. In addition, as required by Section 302 of the Sarbanes-Oxley Act of 2002 (SOX) and Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the Exchange Act), new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV hereof. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. We are not including the certifications under Section 906 of SOX as no financial statements are being filed with this Amendment.   Except as described above, no other changes have been made to the Original Filing. The Original Filing continues to speak as of the date of the Original Filing, and the Company has not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the Original Filing other than as expressly indicated in this Amendment. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company’s other filings made with the SEC on or subsequent to March 12, 2024.
Amendment Flag	true
Entity, Central Index Key	0000811808