SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Subsidiaries Information (Details)	12 Months Ended
	Dec. 31, 2025
City Bank [Member] | Bank Subsidiary [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Wholly-Owned, Consolidated Subsidiaries	City Bank
Ruidoso Retail, Inc. [Member] | Non-bank Subsidiary [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Wholly-Owned, Consolidated Subsidiaries	Ruidoso Retail, Inc.
CB Provence, LLC [Member] | Non-bank Subsidiary [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Wholly-Owned, Consolidated Subsidiaries	CB Provence, LLC
CBT Brushy Creek, LLC [Member] | Non-bank Subsidiary [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Wholly-Owned, Consolidated Subsidiaries	CBT Brushy Creek, LLC
CBT Properties, LLC [Member] | Non-bank Subsidiary [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Wholly-Owned, Consolidated Subsidiaries	CBT Properties, LLC
South Plains Financial Capital Trusts (“SPFCT”) III-V [Member] | Non-bank Subsidiary [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Wholly-Owned, Equity Method Subsidiaries	South Plains Financial Capital Trusts (“SPFCT”) III-V