SECURITIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales of available for sale securities	$ 392,700	$ 365,200	$ 4,900
Gross realized losses	794
Gross realized gains		1,200	$ 49
Carrying value of pledged securities	607,500	978,900
Available for sale securities, at fair value	$ 1,395,680	1,807,586
CBTX
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales of available for sale securities		$ 353,900