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LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | $ 10,116,941 | $ 9,244,661
Non-accrual | 41,081 | 40,307
Aggregate outstanding balance | 2,800 | 3,000
Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 72,906 | 116,696
30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 19,454 | 61,242
60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 9,590 | 12,146
Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,781 | 3,001
Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 10,044,035 | 9,127,965
Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 9,195,863 | 8,294,204
Non-accrual | 11,549 | 12,676
Total real estate loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 34,706 | 77,109
Total real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 15,336 | 57,385
Total real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 7,821 | 5,103
Total real estate loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans |  | 1,945
Total real estate loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 9,161,157 | 8,217,095
One-to-four family residential and cooperative/condominium apartment |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 722,081 | 669,282
Non-accrual | 3,219 | 7,623
One-to-four family residential and cooperative/condominium apartment | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,856 | 13,739
One-to-four family residential and cooperative/condominium apartment | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 496 | 3,294
One-to-four family residential and cooperative/condominium apartment | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 141 | 877
One-to-four family residential and cooperative/condominium apartment | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans |  | 1,945
One-to-four family residential and cooperative/condominium apartment | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 718,225 | 655,543
Multifamily residential and residential mixed-use |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,968,244 | 3,356,346
Multifamily residential and residential mixed-use | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 4,713 | 34,322
Multifamily residential and residential mixed-use | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 4,713 | 30,983
Multifamily residential and residential mixed-use | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 | 3,339
Multifamily residential and residential mixed-use | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,963,531 | 3,322,024
Commercial real estate ("CRE") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 4,264,519 | 3,945,948
Non-accrual | 7,673 | 5,053
Commercial real estate ("CRE") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 25,480 | 29,048
Commercial real estate ("CRE") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 10,127 | 23,108
Commercial real estate ("CRE") | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 7,680 | 887
Commercial real estate ("CRE") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 4,239,039 | 3,916,900
Acquisition, development, and construction |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 241,019 | 322,628
Non-accrual | 657 |
Acquisition, development, and construction | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 657 |
Acquisition, development, and construction | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Acquisition, development, and construction | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Acquisition, development, and construction | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Acquisition, development, and construction | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 240,362 | 322,628
Commercial and Industrial ("C&I") Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 912,151 | 933,559
Non-accrual | 29,532 | 27,266
Commercial and Industrial ("C&I") Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 38,055 | 39,115
Commercial and Industrial ("C&I") Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,973 | 3,753
Commercial and Industrial ("C&I") Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 1,769 | 7,040
Commercial and Industrial ("C&I") Loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,781 | 1,056
Commercial and Industrial ("C&I") Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 874,096 | 894,444
Other Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 8,927 | 16,898
Non-accrual | 0 | 365
Other Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 145 | 472
Other Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 145 | 104
Other Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 | 3
Other Loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Other Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | $ 8,782 | $ 16,426

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