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LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | $ 9,284,871 | $ 5,622,044
Non-accrual | 34,020 | 17,928
Aggregate outstanding balance | 6,300 | 3,300
Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 98,949 | 37,534
30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 51,138 | 15,359
60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 7,509 | 918
Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 6,282 | 3,329
Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 9,185,922 | 5,584,510
Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 8,251,743 | 4,978,195
Non-accrual | 9,919 | 5,425
Total real estate loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 60,442 | 21,257
Total real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 39,446 | 15,351
Total real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 5,052 | 0
Total real estate loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 6,025 | 481
Total real estate loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 8,191,301 | 4,956,938
One-to-four family residential and cooperative/condominium apartment |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 683,665 | 184,989
Non-accrual | 4,938 | 858
One-to-four family residential and cooperative/condominium apartment | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 14,339 | 902
One-to-four family residential and cooperative/condominium apartment | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 3,135 | 0
One-to-four family residential and cooperative/condominium apartment | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 1,245 | 0
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] |  |
Loans | 5,021 | 44
One-to-four family residential and cooperative/condominium apartment | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 669,326 | 184,087
Multifamily residential and residential mixed-use |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 3,468,262 | 2,758,743
Non-accrual | 859 | 1,863
Multifamily residential and residential mixed-use | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 13,848 | 2,300
Multifamily residential and residential mixed-use | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 10,251 | 0
Multifamily residential and residential mixed-use | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 2,738 | 0
Multifamily residential and residential mixed-use | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans |  | 437
Multifamily residential and residential mixed-use | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 3,454,414 | 2,756,443
Commercial real estate ("CRE") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 3,814,437 | 1,878,167
Non-accrual | 4,122 | 2,704
Commercial real estate ("CRE") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 14,555 | 18,055
Commercial real estate ("CRE") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 8,360 | 15,351
Commercial real estate ("CRE") | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 1,069 | 0
Commercial real estate ("CRE") | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 1,004 | 0
Commercial real estate ("CRE") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 3,799,882 | 1,860,112
Acquisition, development, and construction ("ADC") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 285,379 | 156,296
Non-accrual | 0 | 0
Acquisition, development, and construction ("ADC") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 17,700 | 0
Acquisition, development, and construction ("ADC") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 17,700 | 0
Acquisition, development, and construction ("ADC") | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 0 | 0
Acquisition, development, and construction ("ADC") | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 0 | 0
Acquisition, development, and construction ("ADC") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 267,679 | 156,296
Commercial and Industrial ("C&I") Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 1,012,415 | 641,533
Non-accrual | 23,727 | 12,502
Commercial and Industrial ("C&I") Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 37,401 | 16,267
Commercial and Industrial ("C&I") Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 10,962 | 0
Commercial and Industrial ("C&I") Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 2,455 | 917
Commercial and Industrial ("C&I") Loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 257 | 2,848
Commercial and Industrial ("C&I") Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 975,014 | 625,266
Commercial and Industrial ("C&I") Loans | Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans |  | 5,619,728
Other Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 20,713 | 2,316
Non-accrual | 374 | 1
Other Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 1,106 | 10
Other Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 730 | 8
Other Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 2 | 1
Other Loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | 0 | 0
Other Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans | $ 19,607 | $ 2,306

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