LOANS HELD FOR INVESTMENT - Portfolio Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Change in the activity of loan portfolio
Balance at the beginning of the period	$ 2,414,383
Initial funding	185,701
Origination fees and discounts, net of costs	(2,732)
Additional funding	35,000
Amortizing payments	(652)
Loan payoffs	(212,208)
Origination fee accretion	2,280	$ 2,022
Balance at the end of the period	$ 2,421,772