LOANS HELD FOR INVESTMENT - Portfolio Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Change in the activity of loan portfolio
Balance at the beginning of the period	$ 2,414,383
Initial funding	473,200
Origination fees and discounts, net of costs	(7,345)
Additional funding	58,045
Amortizing payments	(1,176)
Loan payoffs	(336,152)
Origination fee accretion	4,938	$ 3,911
Balance at the end of the period	$ 2,605,893