LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Past Due, Financial Instrument [Abstract]
Total	$ 10,866,802	$ 10,869,328
Total Past Due
Past Due, Financial Instrument [Abstract]
Total	106,530	91,122
30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	45,977	10,330
60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	2,512	31,313
90 days or more past due
Past Due, Financial Instrument [Abstract]
Total	0	0
Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	58,041	49,479
Current
Past Due, Financial Instrument [Abstract]
Total	10,760,272	10,778,206
Business Loans
Past Due, Financial Instrument [Abstract]
Total	2,788,201	2,725,726
Business Loans | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	28,382	28,450
Business Loans | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	6,287	3,385
Business Loans | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	151	2,441
Business Loans | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	21,944	22,624
Business Loans | Current
Past Due, Financial Instrument [Abstract]
Total	2,759,819	2,697,276
One-to-Four Family Residential and Cooperative/Condominium Apartment
Past Due, Financial Instrument [Abstract]
Total	961,069	951,528
One-to-Four Family Residential and Cooperative/Condominium Apartment | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	11,663	6,403
One-to-Four Family Residential and Cooperative/Condominium Apartment | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	7,406	1,919
One-to-Four Family Residential and Cooperative/Condominium Apartment | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	494	1,271
One-to-Four Family Residential and Cooperative/Condominium Apartment | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	3,763	3,213
One-to-Four Family Residential and Cooperative/Condominium Apartment | Current
Past Due, Financial Instrument [Abstract]
Total	949,406	945,125
Multifamily Residential and Residential Mixed-Use
Past Due, Financial Instrument [Abstract]
Total	3,779,923	3,820,283
Multifamily Residential and Residential Mixed-Use | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	31,357	31,360
Multifamily Residential and Residential Mixed-Use | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	31,357	3,759
Multifamily Residential and Residential Mixed-Use | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	0	27,601
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	3,748,566	3,788,923
Non-Owner-Occupied Commercial Real Estate
Past Due, Financial Instrument [Abstract]
Total	3,190,898	3,230,535
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member]
Past Due, Financial Instrument [Abstract]
Total	3,190,898	3,230,535
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	34,471	24,225
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	927	1,265
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | 60 to 89 Days Past Due
Past Due, Financial Instrument [Abstract]
Total	1,867
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total	31,677	22,960
Non-Owner-Occupied Commercial Real Estate | Real Estate Loan [Member] | Current
Past Due, Financial Instrument [Abstract]
Total	3,156,427	3,206,310
Acquisition, development, and construction ("ADC")
Past Due, Financial Instrument [Abstract]
Total	140,309	136,172
Acquisition, development, and construction ("ADC") | Total Past Due
Past Due, Financial Instrument [Abstract]
Total	657	657
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	139,652	135,515
Other Loans
Past Due, Financial Instrument [Abstract]
Total	6,402	5,084
Other Loans | Total Past Due
Past Due, Financial Instrument [Abstract]
Total		27
Other Loans | 30 to 59 Days Past Due
Past Due, Financial Instrument [Abstract]
Total		2
Other Loans | Non-Accrual
Past Due, Financial Instrument [Abstract]
Total		25
Other Loans | Current
Past Due, Financial Instrument [Abstract]
Total	$ 6,402	$ 5,057