LOANS HELD FOR INVESTMENT, NET - Allowance for Credit Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Allowance for credit losses:
Allowance for credit losses, Beginning balance			$ 71,743
(Credit) provision for credit losses	$ 5,585	$ 892	10,795	$ (2,756)
Allowance for credit losses, Ending balance	77,812		77,812		$ 71,743
Non-accrual with No Allowance	3,776		3,776		3,780
Non-accrual with Allowance	21,067		21,067		25,319
Reserve	14,838		14,838		14,202
Interest income on non-accrual loans held for investment
Interest income on non-accrual loans	0	0	0	0
Business Loans
Allowance for credit losses:
Allowance for credit losses, Beginning balance	35,981	43,879	35,962	47,029	47,029
(Credit) provision for credit losses	2,212	(542)	2,946	(2,150)
Charge-offs	(1,179)	(3,745)	(1,975)	(5,774)	(15,364)
Recoveries	101	108	182	595
Allowance for credit losses, Ending balance	37,115	39,700	37,115	39,700	35,962
Non-accrual with No Allowance	3,776		3,776		1,482
Non-accrual with Allowance	16,511		16,511		13,185
Reserve	14,384		14,384		12,932
One-to-Four Family Residential and Cooperative/Condominium Apartment
Allowance for credit losses:
Allowance for credit losses, Beginning balance	6,973	6,012	6,813	5,969	5,969
(Credit) provision for credit losses	332	421	492	464
Charge-offs		(14)		(14)	(14)
Allowance for credit losses, Ending balance	7,305	6,419	7,305	6,419	6,813
Non-accrual with Allowance	3,884		3,884		3,248
Reserve	152		152		133
Multifamily Residential and Residential Mixed-Use
Allowance for credit losses:
Allowance for credit losses, Beginning balance	11,171	7,613	7,237	8,360	8,360
(Credit) provision for credit losses	3,737	577	7,671	(170)
Charge-offs	(2,551)		(2,551)		(2)
Allowance for credit losses, Ending balance	12,357	8,190	12,357	8,190	7,237
Non-Owner-Occupied Commercial Real Estate
Allowance for credit losses:
Allowance for credit losses, Beginning balance	19,445	18,076	19,623	20,153	20,153
(Credit) provision for credit losses	(1,105)	364	(1,283)	(1,713)
Allowance for credit losses, Ending balance	18,340	18,440	18,340	18,440	19,623
Non-accrual with No Allowance					2,298
Non-accrual with Allowance	15		15		8,229
Reserve	15		15		832
Acquisition, development, and construction ("ADC")
Allowance for credit losses:
Allowance for credit losses, Beginning balance	2,322	2,515	1,989	1,723	1,723
(Credit) provision for credit losses	133	43	466	835
Allowance for credit losses, Ending balance	2,455	2,558	2,455	2,558	1,989
Non-accrual with Allowance	657		657		657
Reserve	287		287		305
Other Loans
Allowance for credit losses:
Allowance for credit losses, Beginning balance	176	240	119	273	273
(Credit) provision for credit losses	75	127	156	93
Charge-offs	(15)	(33)	(45)	(34)
Recoveries	4	5	10	7
Allowance for credit losses, Ending balance	240	339	240	339	119
Total (includes other loans)
Allowance for credit losses:
Allowance for credit losses, Beginning balance	76,068	78,335	71,743	83,507	83,507
(Credit) provision for credit losses	5,384	990	10,448	(2,641)
Charge-offs	(3,745)	(3,792)	(4,571)	(5,822)
Recoveries	105	113	192	602
Allowance for credit losses, Ending balance	$ 77,812	$ 75,646	$ 77,812	$ 75,646	$ 71,743