LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Past Due, Financial Instrument [Abstract]
Total	$ 10,886,387	$ 10,766,837
Total Past Due
Past Due, Financial Instrument [Abstract]
Total	87,729	42,366
30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	8,238	11,977
60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	30,028	1,290
90 days or more past due
Past Due, Financial Instrument [Abstract]
Total	0	0
Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	49,463	29,099
Current
Past Due, Financial Instrument [Abstract]
Total	10,798,658	10,724,471
Business Loans
Past Due, Financial Instrument [Abstract]
Total	2,651,729	2,308,171
Business Loans | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	31,642	26,930
Business Loans | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	5,098	7,139
Business Loans | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	1,133	1,217
Business Loans | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	25,411	18,574
Business Loans | Current
Past Due, Financial Instrument [Abstract]
Total	2,620,087	2,281,241
One-to-Four Family Residential and Cooperative/Condominium Apartment
Past Due, Financial Instrument [Abstract]
Total	932,767	887,555
One-to-Four Family Residential and Cooperative/Condominium Apartment | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	5,856	7,392
One-to-Four Family Residential and Cooperative/Condominium Apartment | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	680	4,071
One-to-Four Family Residential and Cooperative/Condominium Apartment | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	1,296	73
One-to-Four Family Residential and Cooperative/Condominium Apartment | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	3,880	3,248
One-to-Four Family Residential and Cooperative/Condominium Apartment | Current
Past Due, Financial Instrument [Abstract]
Total	926,911	880,163
Multifamily Residential and Residential Mixed-Use
Past Due, Financial Instrument [Abstract]
Total	3,866,478	4,017,176
Multifamily Residential and Residential Mixed-Use | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	29,725
Multifamily Residential and Residential Mixed-Use | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	2,126
Multifamily Residential and Residential Mixed-Use | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	27,599
Multifamily Residential and Residential Mixed-Use | 90 days or more past due
Past Due, Financial Instrument [Abstract]
Loans 90 Days or More Past Due and Still Accruing Interest	0
Multifamily Residential and Residential Mixed-Use | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	0
Multifamily Residential and Residential Mixed-Use | Current
Past Due, Financial Instrument [Abstract]
Total	3,836,753	4,017,176
Non-Owner-Occupied Commercial Real Estate
Past Due, Financial Instrument [Abstract]
Total	3,280,056	3,379,667
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member]
Past Due, Financial Instrument [Abstract]
Total	3,280,056	3,379,667
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	19,843	6,957
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	334	337
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	19,509	6,620
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Current
Past Due, Financial Instrument [Abstract]
Total	3,260,213	3,372,710
Acquisition, development, and construction ("ADC")
Past Due, Financial Instrument [Abstract]
Total	149,299	168,513
Acquisition, development, and construction ("ADC") | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	657	1,087
Acquisition, development, and construction ("ADC") | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total		430
Acquisition, development, and construction ("ADC") | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	657	657
Acquisition, development, and construction ("ADC") | Current
Past Due, Financial Instrument [Abstract]
Total	148,642	167,426
Other Loans
Past Due, Financial Instrument [Abstract]
Total	6,058	5,755
Other Loans | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	6
Other Loans | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	6
Other Loans | Current
Past Due, Financial Instrument [Abstract]
Total	$ 6,052	$ 5,755