LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Past Due, Financial Instrument [Abstract]
Total	$ 10,824,518	$ 10,766,837
Total Past Due
Past Due, Financial Instrument [Abstract]
Total	78,181	42,366
30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	20,911	11,977
60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	32,427	1,290
90 days or more past due
Past Due, Financial Instrument [Abstract]
Total	0	0
Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	24,843	29,099
Current
Past Due, Financial Instrument [Abstract]
Total	10,746,337	10,724,471
Business Loans
Past Due, Financial Instrument [Abstract]
Total	2,530,782	2,308,171
Business Loans | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	29,129	26,930
Business Loans | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	6,465	7,139
Business Loans | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	2,377	1,217
Business Loans | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	20,287	18,574
Business Loans | Current
Past Due, Financial Instrument [Abstract]
Total	2,501,653	2,281,241
One-to-Four Family Residential and Cooperative/Condominium Apartment
Past Due, Financial Instrument [Abstract]
Total	906,862	887,555
One-to-Four Family Residential and Cooperative/Condominium Apartment | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	11,283	7,392
One-to-Four Family Residential and Cooperative/Condominium Apartment | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	5,626	4,071
One-to-Four Family Residential and Cooperative/Condominium Apartment | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	1,773	73
One-to-Four Family Residential and Cooperative/Condominium Apartment | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	3,884	3,248
One-to-Four Family Residential and Cooperative/Condominium Apartment | Current
Past Due, Financial Instrument [Abstract]
Total	895,579	880,163
Multifamily Residential and Residential Mixed-Use
Past Due, Financial Instrument [Abstract]
Total	3,920,327	4,017,176
Multifamily Residential and Residential Mixed-Use | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	29,806
Multifamily Residential and Residential Mixed-Use | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	2,229
Multifamily Residential and Residential Mixed-Use | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	27,577
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	3,890,521	4,017,176
Non-Owner-Occupied Commercial Real Estate
Past Due, Financial Instrument [Abstract]
Total	3,314,988	3,379,667
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member]
Past Due, Financial Instrument [Abstract]
Total	3,314,988	3,379,667
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	7,212	6,957
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	6,497	337
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	700
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	15	6,620
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Current
Past Due, Financial Instrument [Abstract]
Total	3,307,776	3,372,710
Acquisition, development, and construction ("ADC")
Past Due, Financial Instrument [Abstract]
Total	144,860	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	144,203	167,426
Other Loans
Past Due, Financial Instrument [Abstract]
Total	6,699	5,755
Other Loans | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	94
Other Loans | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	94
Other Loans | Current
Past Due, Financial Instrument [Abstract]
Total	$ 6,605	$ 5,755