LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	$ 10,871,943	$ 10,773,428
Allowance for credit losses	88,751	71,743
Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	32,891	11,004
Allowance for credit losses	2,111	926
Business Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	42,898	35,962	$ 47,029	$ 62,366
Business Loans | Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	9,290	3,742
Allowance for credit losses	1,408
One-to-Four Family Residential and Cooperative/Condominium Apartment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	9,501	6,813	5,969	5,932
Multifamily Residential and Residential Mixed-Use
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	11,946	7,237	8,360	7,816
Non-Owner-Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	21,876	19,623	20,153	2,131
Non-Owner-Occupied Commercial Real Estate | Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	22,944	6,605
Allowance for credit losses	416	621
Acquisition, development, and construction ("ADC")
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	2,323	1,989	1,723	4,857
Acquisition, development, and construction ("ADC") | Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	657	657
Allowance for credit losses	287	305
Other Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 207	$ 119	$ 273	$ 751