PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Balance Sheets (Details) - South Plains Financial, Inc. [Member] - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
ASSETS
Cash and cash equivalents	$ 80,159	$ 104,856
Other assets	11,036	9,060
Total assets	556,330	550,956
LIABILITIES AND STOCKHOLDERS’ EQUITY
Debt	60,493	110,354
Accrued expenses and other liabilities	2,000	1,653
Stockholders’ equity	493,837	438,949
Total liabilities and stockholders’ equity	556,330	550,956
Bank Subsidiary [Member]
ASSETS
Investment in subsidiary	465,084	436,989
Other Subsidiary [Member]
ASSETS
Investment in subsidiary	$ 51	$ 51