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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Apr. 01, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Leases [Abstract]              
Retained earnings   $ 325,772 $ 292,261        
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   $ 43,137 39,288 $ 39,560 $ 39,785 $ 39,649 $ 42,098
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          
Goodwill and Other Intangible Assets [Abstract]              
Goodwill impairment loss   $ 0 $ 0        
Segment Information [Abstract]              
Number of operating segments | Segment     2        
Pre-Adoption [Member]              
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     39,288        
Allowance for credit losses for off-balance sheet exposures     580        
Commercial Real Estate [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   14,501 13,029 13,381 13,903 14,621 17,245
Commercial Real Estate [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     13,029        
Commercial [Member] | Specialized [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   4,154 3,425 3,510 3,355 3,275 4,363
Commercial [Member] | Specialized [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     3,425        
Commercial [Member] | General [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   7,637 9,215 6,267 9,918 9,940 8,466
Commercial [Member] | General [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     9,215        
Consumer [Member] | 1-4 Family Residential [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   8,851 6,194 8,531 5,329 4,931 5,268
Consumer [Member] | 1-4 Family Residential [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     6,194        
Consumer [Member] | Auto Loans [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   3,900 3,926 3,714 3,958 3,681 3,653
Consumer [Member] | Auto Loans [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     3,926        
Consumer [Member] | Other Consumer [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   1,107 1,376 1,101 1,443 1,384 1,357
Consumer [Member] | Other Consumer [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     1,376        
Construction [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   $ 2,987 2,123 $ 3,056 $ 1,879 $ 1,817 $ 1,746
Construction [Member] | Pre-Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     2,123        
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        
ASU 2016-13 [Member] | Impact of Adoption [Member]              
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        
ASU 2016-13 [Member] | Commercial Real Estate [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     13,856        
ASU 2016-13 [Member] | Commercial Real Estate [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     827        
ASU 2016-13 [Member] | Commercial [Member] | Specialized [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     3,458        
ASU 2016-13 [Member] | Commercial [Member] | Specialized [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     33        
ASU 2016-13 [Member] | Commercial [Member] | General [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     6,641        
ASU 2016-13 [Member] | Commercial [Member] | General [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     (2,574)        
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        
ASU 2016-13 [Member] | Consumer [Member] | 1-4 Family Residential [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     1,700        
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        
ASU 2016-13 [Member] | Consumer [Member] | Auto Loans [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     (332)        
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        
ASU 2016-13 [Member] | Consumer [Member] | Other Consumer [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     (235)        
ASU 2016-13 [Member] | Construction [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     2,806        
ASU 2016-13 [Member] | Construction [Member] | Impact of Adoption [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     683        
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          
City Bank [Member] | Bank Subsidiary [Member]              
Subsidiaries Information [Abstract]              
Wholly-Owned, Consolidated Subsidiaries   City Bank          
Windmark [Member]              
Windmark Sale [Abstract]              
Aggregate purchase price $ 35,500            
Pre-tax gain on sale of subsidiary $ 33,500            
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          
Core Deposit Intangible [Member] | Maximum [Member]              
Goodwill and Other Intangible Assets [Abstract]              
Estimated useful lives   10 years          
Cumulative Effect, Period of Adoption, Adjustment [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   $ 102          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Real Estate [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   827          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] | Specialized [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   33          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] | General [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   (2,574)          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer [Member] | 1-4 Family Residential [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   1,700          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer [Member] | Auto Loans [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   (332)          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer [Member] | Other Consumer [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   (235)          
Cumulative Effect, Period of Adoption, Adjustment [Member] | Construction [Member]              
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans   $ 683          
Cumulative Effect, Period of Adoption, Adjustment [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     1,200        
Adoption Impact on ACL for CECL [Abstract]              
Total allowance for credit losses on loans     100        
Allowance for credit losses for off-balance sheet exposures     $ 1,200