LOANS HELD FOR INVESTMENT, NET - Amortized cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 34,024	$ 37,747
% of Total Class of Financing Receivable	0.30%	0.30%
Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified		$ 126
Significant Payment Delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 33,995	36,849
Term Extension and Significant Payment Delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified		471
Significant Payment Delay And Interest Rate Deduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	29	301
Business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 9,319	$ 10,188
% of Total Class of Financing Receivable	0.40%	0.40%
Business loans | Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified		$ 126
Business loans | Significant Payment Delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 9,290	9,290
Business loans | Term Extension and Significant Payment Delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified		471
Business loans | Significant Payment Delay And Interest Rate Deduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 29	301
One-to-four family residential and cooperative/condominium apartment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified		$ 2,854
% of Total Class of Financing Receivable	0.00%	0.30%
One-to-four family residential and cooperative/condominium apartment | Significant Payment Delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified		$ 2,854
Multifamily residential and residential mixed-use
Financing Receivable, Allowance for Credit Loss [Line Items]
% of Total Class of Financing Receivable	0.00%	0.00%
Non-owner-occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 24,705	$ 24,705
% of Total Class of Financing Receivable	0.70%	0.70%
Non-owner-occupied commercial real estate | Significant Payment Delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans that have been modified	$ 24,705	$ 24,705
Acquisition, development, and construction ("ADC")
Financing Receivable, Allowance for Credit Loss [Line Items]
% of Total Class of Financing Receivable	0.00%	0.00%
Other Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
% of Total Class of Financing Receivable	0.00%	0.00%