PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION, Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS [Abstract]
Cash and cash equivalents	$ 330,158	$ 234,883
Other assets	47,396	48,181
Total assets	4,204,793	3,944,063
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Accrued expenses and other liabilities	61,358	58,265
Stockholders' equity	407,114	357,014	$ 407,427	$ 370,048
Total liabilities and stockholders' equity	4,204,793	3,944,063
South Plains Financial, Inc. [Member]
ASSETS [Abstract]
Cash and cash equivalents	87,167	98,996
Other assets	12,592	9,214
Total assets	520,487	481,569
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Debt	110,168	122,354
Accrued expenses and other liabilities	3,205	2,201
Stockholders' equity	407,114	357,014
Total liabilities and stockholders' equity	520,487	481,569
South Plains Financial, Inc. [Member] | Bank Subsidiary [Member]
ASSETS [Abstract]
Investment in subsidiary	420,677	373,308
South Plains Financial, Inc. [Member] | Other Subsidiary [Member]
ASSETS [Abstract]
Investment in subsidiary	$ 51	$ 51