LOANS HELD FOR INVESTMENT, NET - Loans by Category Modified as TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) loan	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) loan	Dec. 31, 2021 USD ($) contract	Dec. 31, 2023 USD ($) loan	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 83,507	$ 83,507	$ 83,507				$ 71,743
Number of loans | loan							0
Number of Loans | loan		12			4
Pre-Modification Outstanding Recorded Investment	37,463			$ 10,923
Post-Modification Outstanding Recorded Investment	37,467			10,955
TDRs
Financing Receivable, Allowance for Credit Loss [Line Items]
Modifications recorded investment	22,100	$ 22,100	22,100	942	$ 942	$ 942
Commitments to lend additional amounts	0			0
Allowance for credit losses	9,100	9,100	9,100	48	48	48
Charge offs relating to TDRs	0			0
Provision for Loan and Lease Losses				48
C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	39,853	$ 39,853	39,853	35,331	$ 35,331	35,331	$ 28,977	$ 12,737
Number of Loans | loan		7			1
Pre-Modification Outstanding Recorded Investment	21,934			456
Post-Modification Outstanding Recorded Investment	21,938			488
One-to-four family residential and cooperative/condominium apartment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	5,969	$ 5,969	5,969	5,932	$ 5,932	5,932	6,813	644
Number of Loans | loan		2			2
Pre-Modification Outstanding Recorded Investment	762			467
Post-Modification Outstanding Recorded Investment	762			467
Multifamily residential and residential mixed-use
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	8,360	$ 8,360	8,360	7,816	$ 7,816	7,816	7,237	17,016
Commercial real estate ("CRE")
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	27,329	$ 27,329	$ 27,329	29,166	$ 29,166	$ 29,166	26,608	9,059
Number of Loans		1	1		1	1
Pre-Modification Outstanding Recorded Investment	991			10,000
Post-Modification Outstanding Recorded Investment	991			10,000
Acquisition, development, and construction ("ADC")
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	1,723	$ 1,723	$ 1,723	4,857	$ 4,857	$ 4,857	1,989	1,993
Number of Loans		1	1
Pre-Modification Outstanding Recorded Investment	13,500
Post-Modification Outstanding Recorded Investment	13,500
Other Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	273	$ 273	$ 273	$ 751	$ 751	$ 751	$ 119	$ 12
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	276
Post-Modification Outstanding Recorded Investment	$ 276