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LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | $ 9,244,661 | $ 5,622,044
Non-accrual | 40,307 | 17,928
Aggregate outstanding balance | 3,000 | 3,300
Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 116,696 | 37,534
30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 61,242 | 15,359
60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 12,146 | 918
Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,001 | 3,329
Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 9,127,965 | 5,584,510
Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 8,294,204 | 4,978,195
Non-accrual | 12,676 | 5,425
Total real estate loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 77,109 | 21,257
Total real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 57,385 | 15,351
Total real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 5,103 |
Total real estate loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 1,945 | 481
Total real estate loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 8,217,095 | 4,956,938
One-to-four family residential and cooperative/condominium apartment |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 669,282 | 184,989
Non-accrual | 7,623 | 858
One-to-four family residential and cooperative/condominium apartment | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 13,739 | 902
One-to-four family residential and cooperative/condominium apartment | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,294 |
One-to-four family residential and cooperative/condominium apartment | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 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] |  |
Principal balances outstanding | 1,945 | 44
One-to-four family residential and cooperative/condominium apartment | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 655,543 | 184,087
Multifamily residential and residential mixed-use |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,356,346 | 2,758,743
Non-accrual |  | 1,863
Multifamily residential and residential mixed-use | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 34,322 | 2,300
Multifamily residential and residential mixed-use | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 30,983 |
Multifamily residential and residential mixed-use | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,339 |
Multifamily residential and residential mixed-use | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding |  | 437
Multifamily residential and residential mixed-use | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,322,024 | 2,756,443
Commercial real estate ("CRE") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,945,948 | 1,878,167
Non-accrual | 5,053 | 2,704
Commercial real estate ("CRE") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 29,048 | 18,055
Commercial real estate ("CRE") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 23,108 | 15,351
Commercial real estate ("CRE") | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 887 |
Commercial real estate ("CRE") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,916,900 | 1,860,112
Acquisition, development, and construction ("ADC") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 322,628 | 156,296
Acquisition, development, and construction ("ADC") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 322,628 | 156,296
Commercial and Industrial ("C&I") Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 933,559 | 641,533
Non-accrual | 27,266 | 12,502
Commercial and Industrial ("C&I") Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 39,115 | 16,267
Commercial and Industrial ("C&I") Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3,753 |
Commercial and Industrial ("C&I") Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 7,040 | 917
Commercial and Industrial ("C&I") Loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 1,056 | 2,848
Commercial and Industrial ("C&I") Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 894,444 | 625,266
Commercial and Industrial ("C&I") Loans | Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding |  | 5,619,728
Other Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 16,898 | 2,316
Non-accrual | 365 | 1
Other Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 472 | 10
Other Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 104 | 8
Other Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | 3 | 1
Other Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Principal balances outstanding | $ 16,426 | $ 2,306

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