SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Nature of Operations (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2023	Dec. 31, 2024
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	$ 36.1
Pre-tax gain on sale of subsidiary	$ 33.8