PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION, Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS [Abstract]
Cash and cash equivalents	$ 359,082	$ 330,158
Other assets	42,699	47,396
Total assets	4,232,239	4,204,793
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Accrued expenses and other liabilities	62,060	61,358
Stockholders' equity	438,949	407,114	$ 357,014	$ 407,427
Total liabilities and stockholders' equity	4,232,239	4,204,793
South Plains Financial, Inc. [Member]
ASSETS [Abstract]
Cash and cash equivalents	104,856	87,167
Other assets	9,060	12,592
Total assets	550,956	520,487
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Debt	110,354	110,168
Accrued expenses and other liabilities	1,653	3,205
Stockholders' equity	438,949	407,114
Total liabilities and stockholders' equity	550,956	520,487
South Plains Financial, Inc. [Member] | Bank Subsidiary [Member]
ASSETS [Abstract]
Investment in subsidiary	436,989	420,677
South Plains Financial, Inc. [Member] | Other Subsidiary [Member]
ASSETS [Abstract]
Investment in subsidiary	$ 51	$ 51