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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
1 Months Ended 6 Months Ended
Mar. 11, 2019
$ / shares
shares
May 31, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Change in Capital Structure [Abstract]        
Number of common stock shares authorized after change in capital structure (in shares) | shares 30,000,000   30,000,000 30,000,000
Common stock, par value (in dollars per share) | $ / shares $ 1   $ 1.00 $ 1.00
Stock split ratio 29      
Pro Forma Information [Abstract]        
Federal tax rate     21.00%  
Change in Accounting Principle [Abstract]        
Cumulative-effect adjustment to retained earnings, net     $ 1,300,000  
Cumulative-effect adjustment to retained earnings, before tax     1,600,000  
Cumulative-effect adjustment to retained earnings, tax     $ 340,000  
Initial Public Offering [Member]        
Stock Offering [Abstract]        
Common stock issued and sold (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   $ 56,100,000    
Aggregate net proceeds from initial public offering   $ 51,400,000    
City Bank [Member] | Bank Subsidiary [Member]        
Subsidiaries Information [Abstract]        
Wholly Owned, Consolidated Subsidiaries     City Bank  
Windmark Insurance Agency Inc. [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  
Stock Appreciation Rights (SARs) [Member]        
Change in Accounting Principle [Abstract]        
Fair value in excess of recorded intrinsic value       $ 1,600,000