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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
12 Months Ended
Apr. 01, 2023
USD ($)
Dec. 31, 2023
USD ($)
Segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Leases [Abstract]          
Retained earnings   $ 345,264 $ 292,261    
Right-of-use asset   8,681 7,938    
Lease liabilities   9,630 8,897    
Accounting Standards Update and Change in Accounting Principle [Abstract]          
ACL for off-balance sheet credit exposures     580    
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   $ 42,356 39,288 $ 42,098 $ 45,553
Allowance for credit losses for off-balance sheet exposures     580    
Securities [Abstract]          
Number of days principal or interest is in default for securities to be placed on nonaccrual status   90 days      
Loans [Abstract]          
Number of days principal or interest payments are past due for loans to be placed on nonaccrual status   90 days      
Allowance for Loan Losses [Abstract]          
Period for estimate of expected credit loss for each loan   1 year      
Period of macroeconomic variables forecast   1 year      
Off-Balance Sheet Credit Exposures [Abstract]          
Period of rolling average of historical usage used for determining utilization rates   2 years      
Mortgage Servicing Rights [Abstract]          
Servicing income   $ 4,200 4,100 3,100  
Goodwill and Other Intangible Assets [Abstract]          
Goodwill impairment loss   0 0 0  
Mortgage Banking Derivatives [Abstract]          
Recorded value of interest locks at inception   0      
Recorded value of forward loan sales commitments at inception   0      
Advertising [Abstract]          
Advertising costs   $ 2,900 3,100 2,600  
Segment Information [Abstract]          
Number of operating segments | Segment   2      
Minimum [Member]          
Allowance for Loan Losses [Abstract]          
Adjusted period for reasonable and supportable economic forecast   1 year      
Maximum [Member]          
Allowance for Loan Losses [Abstract]          
Adjusted period for reasonable and supportable economic forecast   2 years      
Commercial Real Estate [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   $ 15,808 13,029 17,245 18,962
Commercial [Member] | Specialized [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   4,020 3,425 4,363 5,760
Commercial [Member] | General [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   6,391 9,215 8,466 9,227
Consumer [Member] | 1-4 Family Residential [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   9,177 6,194 5,268 4,646
Consumer [Member] | Auto Loans [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   3,601 3,926 3,653 4,226
Consumer [Member] | Other Consumer [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   968 1,376 1,357 1,671
Construction [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans   $ 2,391 2,123 $ 1,746 $ 1,061
Core Deposit Intangible [Member]          
Goodwill and Other Intangible Assets [Abstract]          
Estimated useful lives   10 years      
ASU 2016-02 [Member]          
Leases [Abstract]          
Right-of-use asset   $ 9,400      
Lease liabilities   $ 10,300      
Building and Improvements [Member] | Maximum [Member]          
Premises and Equipment [Abstract]          
Useful life   40 years      
Furniture and Equipment [Member] | Minimum [Member]          
Premises and Equipment [Abstract]          
Useful life   3 years      
Furniture and Equipment [Member] | Maximum [Member]          
Premises and Equipment [Abstract]          
Useful life   10 years      
City Bank [Member] | Bank Subsidiary [Member]          
Subsidiaries Information [Abstract]          
Wholly-Owned, Consolidated Subsidiaries   City Bank      
Ruidoso Retail, Inc. [Member] | Non-bank Subsidiary [Member]          
Subsidiaries Information [Abstract]          
Wholly-Owned, Consolidated Subsidiaries   Ruidoso Retail, Inc.      
CB Provence, LLC [Member] | Non-bank Subsidiary [Member]          
Subsidiaries Information [Abstract]          
Wholly-Owned, Consolidated Subsidiaries   CB Provence, LLC      
CBT Brushy Creek, LLC [Member] | Non-bank Subsidiary [Member]          
Subsidiaries Information [Abstract]          
Wholly-Owned, Consolidated Subsidiaries   CBT Brushy Creek, LLC      
CBT Properties, LLC [Member] | Non-bank Subsidiary [Member]          
Subsidiaries Information [Abstract]          
Wholly-Owned, Consolidated Subsidiaries   CBT Properties, LLC      
South Plains Financial Capital Trusts ("SPFCT") III-V [Member] | Non-bank Subsidiary [Member]          
Subsidiaries Information [Abstract]          
Wholly-Owned, Equity Method Subsidiaries   South Plains Financial Capital Trusts (“SPFCT”) III-V      
Windmark [Member]          
Windmark Sale [Abstract]          
Aggregate purchase price $ 36,100        
Pre-tax gain on sale of subsidiary $ 33,800        
Impact of Adoption [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     102    
Impact of Adoption [Member] | Commercial Real Estate [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     827    
Impact of Adoption [Member] | Commercial [Member] | Specialized [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     33    
Impact of Adoption [Member] | Commercial [Member] | General [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     (2,574)    
Impact of Adoption [Member] | Consumer [Member] | 1-4 Family Residential [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     1,700    
Impact of Adoption [Member] | Consumer [Member] | Auto Loans [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     (332)    
Impact of Adoption [Member] | Consumer [Member] | Other Consumer [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     (235)    
Impact of Adoption [Member] | Construction [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     683    
Impact of Adoption [Member] | ASU 2016-13 [Member]          
Leases [Abstract]          
Retained earnings     (997)    
Accounting Standards Update and Change in Accounting Principle [Abstract]          
ACL for off-balance sheet credit exposures     1,160    
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     102    
Allowance for credit losses for off-balance sheet exposures     1,160    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Commercial Real Estate [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     827    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Commercial [Member] | Specialized [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     33    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Commercial [Member] | General [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     (2,574)    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Consumer [Member] | 1-4 Family Residential [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     1,700    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Consumer [Member] | Auto Loans [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     (332)    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Consumer [Member] | Other Consumer [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     (235)    
Impact of Adoption [Member] | ASU 2016-13 [Member] | Construction [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     683    
Impact of Adoption [Member] | ASU 2016-02 [Member]          
Leases [Abstract]          
Retained earnings   $ (717)      
Post-Adoption [Member] | ASU 2016-13 [Member]          
Accounting Standards Update and Change in Accounting Principle [Abstract]          
ACL for off-balance sheet credit exposures     1,740    
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     39,390    
Allowance for credit losses for off-balance sheet exposures     1,740    
Post-Adoption [Member] | ASU 2016-13 [Member] | Commercial Real Estate [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     13,856    
Post-Adoption [Member] | ASU 2016-13 [Member] | Commercial [Member] | Specialized [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     3,458    
Post-Adoption [Member] | ASU 2016-13 [Member] | Commercial [Member] | General [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     6,641    
Post-Adoption [Member] | ASU 2016-13 [Member] | Consumer [Member] | 1-4 Family Residential [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     7,894    
Post-Adoption [Member] | ASU 2016-13 [Member] | Consumer [Member] | Auto Loans [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     3,594    
Post-Adoption [Member] | ASU 2016-13 [Member] | Consumer [Member] | Other Consumer [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     1,141    
Post-Adoption [Member] | ASU 2016-13 [Member] | Construction [Member]          
Adoption Impact on ACL for CECL [Abstract]          
Total allowance for credit losses on loans     $ 2,806