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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 11, 2019
$ / shares
shares
May 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Segment
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Mar. 10, 2019
shares
Dec. 31, 2018
USD ($)
Change in Capital Structure [Abstract]              
Number of shares of common stock authorized (in shares) | shares 30,000,000   30,000,000 30,000,000   1,000,000  
Common stock, par value (in dollars per share) | $ / shares $ 1.00   $ 1 $ 1      
Stock split ratio 29            
Loans [Abstract]              
Number of days principal or interest payments are past due for loans to be placed on nonaccrual status     90 days        
Mortgage Servicing Rights [Abstract]              
Servicing income     $ 3,100 $ 781 $ 325    
Goodwill and Other Intangible Assets [Abstract]              
Impairment loss     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     $ 2,600 2,600 $ 2,200    
Segment Information [Abstract]              
Number of reportable segments | Segment     2        
Change in Accounting Principle [Abstract]              
Cumulative-effect adjustment to retained earnings, net     $ 242,750 $ 189,521      
Minimum [Member]              
Allowance for Loan Losses [Abstract]              
Threshold balance of loan to be specifically reviewed for impairment     250        
Minimum [Member] | ASU 2016-02 [Member]              
Recent Accounting Pronouncements [Abstract]              
Right-of-use asset     9,800        
Lease liability     9,800        
Maximum [Member] | ASU 2016-02 [Member]              
Recent Accounting Pronouncements [Abstract]              
Right-of-use asset     10,700        
Lease liability     $ 10,700        
Cumulative Effect, Period of Adoption, Adjustment [Member]              
Change in Accounting Principle [Abstract]              
Cumulative-effect adjustment to retained earnings, net             $ 1,300
Cumulative-effect adjustment to retained earnings, before tax             1,600
Cumulative-effect adjustment to retained earnings, tax             340
City Bank [Member] | Bank Subsidiary [Member]              
Subsidiaries Information [Abstract]              
Wholly-Owned, Consolidated Subsidiaries     City Bank        
Windmark Insurance Agency, Inc. ("Windmark") [Member] | Non-bank Subsidiary [Member]              
Subsidiaries Information [Abstract]              
Wholly-Owned, Consolidated Subsidiaries     Windmark Insurance Agency, Inc.        
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]              
Goodwill and Other Intangible Assets [Abstract]              
Estimated useful lives     10 years        
Customer Relationships [Member]              
Goodwill and Other Intangible Assets [Abstract]              
Estimated useful lives     5 years        
Employment Agreements [Member]              
Goodwill and Other Intangible Assets [Abstract]              
Estimated useful lives     5 years        
Initial Public Offering [Member]              
Stock Offering [Abstract]              
Issuance of common stock, net (in shares) | shares   3,207,000          
Common stock sold to underwriters (in shares) | shares   507,000          
Offering price (in dollars per share) | $ / shares   $ 17.50          
Aggregate gross proceeds from initial public offering   $ 56,100          
Aggregate net proceeds from initial public offering   $ 51,400          
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        
Substandard or Worse [Member] | Minimum [Member]              
Allowance for Loan Losses [Abstract]              
Threshold balance of loan to be specifically reviewed for impairment     $ 250        
Stock Appreciation Rights (SARs) [Member]              
Change in Accounting Principle [Abstract]              
Fair value in excess of recorded intrinsic value             $ 1,600