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BORROWING ARRANGEMENTS, Junior Subordinated Deferrable Interest Debentures and Trust Preferred Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Detail of debentures and TPS [Abstract]    
Amount of debentures $ 46,393 $ 46,393
Trust Preferred Securities [Member]    
Junior Subordinated Deferrable Interest Debentures and Trust Preferred Securities [Abstract]    
Common capital securities issued by the trusts 1,400  
Detail of debentures and TPS [Abstract]    
Amount of TPS 45,000  
Debentures [Member]    
Detail of debentures and TPS [Abstract]    
Amount of debentures $ 46,393  
Debentures and Trust Preferred Securities [Member] | Maximum [Member]    
Junior Subordinated Deferrable Interest Debentures and Trust Preferred Securities [Abstract]    
Number of consecutive years during which interest can be deferred 5 years  
Detail of debentures and TPS [Abstract]    
Period after issue date when debt securities may be redeemed 5 years  
South Plains Financial Capital Trust III [Member] | Trust Preferred Securities [Member]    
Detail of debentures and TPS [Abstract]    
Amount of TPS $ 10,000  
South Plains Financial Capital Trust III [Member] | Debentures [Member]    
Detail of debentures and TPS [Abstract]    
Amount of debentures $ 10,310  
South Plains Financial Capital Trust III [Member] | Debentures and Trust Preferred Securities [Member]    
Detail of debentures and TPS [Abstract]    
Issue date Dec. 31, 2004  
Stated maturity date [1] Dec. 31, 2034  
Interest rate [2],[3] 2.77%  
South Plains Financial Capital Trust III [Member] | Debentures and Trust Preferred Securities [Member] | LIBOR [Member]    
Detail of debentures and TPS [Abstract]    
Term of variable rate [2],[3] 3 months  
Basis spread on variable rate [2],[3] 2.65%  
South Plains Financial Capital Trust IV [Member] | Trust Preferred Securities [Member]    
Detail of debentures and TPS [Abstract]    
Amount of TPS $ 20,000  
South Plains Financial Capital Trust IV [Member] | Debentures [Member]    
Detail of debentures and TPS [Abstract]    
Amount of debentures $ 20,619  
South Plains Financial Capital Trust IV [Member] | Debentures and Trust Preferred Securities [Member]    
Detail of debentures and TPS [Abstract]    
Issue date Dec. 31, 2005  
Stated maturity date [1] Dec. 31, 2035  
Interest rate [2],[3] 1.59%  
South Plains Financial Capital Trust IV [Member] | Debentures and Trust Preferred Securities [Member] | LIBOR [Member]    
Detail of debentures and TPS [Abstract]    
Term of variable rate [2],[3] 3 months  
Basis spread on variable rate [2],[3] 1.39%  
South Plains Financial Capital Trust V [Member] | Trust Preferred Securities [Member]    
Detail of debentures and TPS [Abstract]    
Amount of TPS $ 15,000  
South Plains Financial Capital Trust V [Member] | Debentures [Member]    
Detail of debentures and TPS [Abstract]    
Amount of debentures $ 15,464  
South Plains Financial Capital Trust V [Member] | Debentures and Trust Preferred Securities [Member]    
Detail of debentures and TPS [Abstract]    
Issue date Dec. 31, 2007  
Stated maturity date [1] Dec. 31, 2037  
Interest rate [2],[3] 1.70%  
South Plains Financial Capital Trust V [Member] | Debentures and Trust Preferred Securities [Member] | LIBOR [Member]    
Detail of debentures and TPS [Abstract]    
Term of variable rate [2],[3] 3 months  
Basis spread on variable rate [2],[3] 1.50%  
[1] May be redeemed five years from the issue date, the Company has no current plans to redeem;
[2] Interest payable quarterly with principal due at maturity;
[3] Rate as of last reset date.