Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Mar. 05, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity File Number	001-38895
Entity Registrant Name	South Plains Financial, Inc.
Entity Central Index Key	0001163668
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	75-2453320
Entity Address, Address Line One	5219 City Bank Parkway
Entity Address, City or Town	Lubbock
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	79407
City Area Code	806
Local Phone Number	792-7101
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	SPFI
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	true
Document Financial Statement Error Correction [Flag]	true
Document Financial Statement Restatement Recovery Analysis [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 328.6
Entity Common Stock, Shares Outstanding		16,485,647
Auditor Firm ID	686
Auditor Name	Forvis Mazars, LLP
Auditor Location	Houston, Texas