LOANS HELD FOR INVESTMENT, NET - Loan Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans held for investment, net:
Total	$ 10,866,802	$ 10,869,328
Fair value hedge basis point adjustments	1,933	2,615
Total loans, net of fair value hedge basis point adjustments	10,868,735	10,871,943
Allowance for credit losses	(90,455)	(88,751)
Total loans held for investment, net	10,778,280	10,783,192
Business Loans
Loans held for investment, net:
Total	2,788,201	2,725,726
Allowance for credit losses	(43,915)	(42,898)	$ (35,981)	$ (35,962)
One-to-Four Family Residential and Cooperative/Condominium Apartment
Loans held for investment, net:
Total	961,069	951,528
Allowance for credit losses	(9,745)	(9,501)	(6,973)	(6,813)
Multifamily Residential and Residential Mixed-Use
Loans held for investment, net:
Total	3,779,923	3,820,283
Allowance for credit losses	(13,087)	(11,946)	(11,171)	(7,237)
Non-Owner-Occupied Commercial Real Estate
Loans held for investment, net:
Total	3,190,898	3,230,535
Allowance for credit losses	(21,075)	(21,876)	(19,445)	(19,623)
Acquisition, development, and construction ("ADC")
Loans held for investment, net:
Total	140,309	136,172
Allowance for credit losses	(2,360)	(2,323)	(2,322)	(1,989)
Other Loans
Loans held for investment, net:
Total	6,402	5,084
Allowance for credit losses	$ (273)	$ (207)	$ (176)	$ (119)