v3.26.1
Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 04, 2026
Document Information Line Items    
Entity Central Index Key 0001163668  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Entity File Number 001-38895  
Entity Registrant Name South Plains Financial, Inc.  
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, $1.00 par value per share  
Trading Symbol SPFI  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   19,145,754
Amendment Flag false  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31