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LOANS HELD FOR INVESTMENT, NET - Past Due (Details) $ in Thousands | Mar. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | $ 35,549 | [1] | $ 17,928
Total past due | 86,211 |  | 37,534
Current | 10,419,887 |  | 5,584,510
Loans | $ 10,506,098 |  | $ 5,622,044
Number of loans receivables outstanding | loan | 8 |  | 3
Aggregate outstanding balance | $ 8,800 |  | $ 3,300
30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 28,976 |  | 15,359
60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 12,859 |  | 918
Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 8,827 |  | 3,329
Real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 20,927 | [1] | 5,425
Total past due | 54,175 |  | 21,257
Current | 8,094,904 |  | 4,956,938
Loans | 8,149,079 |  | 4,978,195
Real estate | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 15,713 |  | 15,351
Real estate | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 12,360 |  | 0
Real estate | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 5,175 |  | 481
Real estate | One-to-four family residential and cooperative/condominium apartment |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 5,384 | [1] | 858
Total past due | 13,142 |  | 902
Current | 683,273 |  | 184,087
Loans | 696,415 |  | 184,989
Real estate | One-to-four family residential and cooperative/condominium apartment | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 7,027 |  | 0
Real estate | One-to-four family residential and cooperative/condominium apartment | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 686 |  | 0
Real estate | One-to-four family residential and cooperative/condominium apartment | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 45 |  | 44
Real estate | Multifamily residential and residential mixed-use |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 4,844 | [1] | 1,863
Total past due | 20,039 |  | 2,300
Current | 3,547,168 |  | 2,756,443
Loans | 3,567,207 |  | 2,758,743
Real estate | Multifamily residential and residential mixed-use | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 3,984 |  | 0
Real estate | Multifamily residential and residential mixed-use | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 8,340 |  | 0
Real estate | Multifamily residential and residential mixed-use | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 2,871 |  | 437
Real estate | Commercial real estate ("CRE") |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 10,595 | [1] | 2,704
Total past due | 20,890 |  | 18,055
Current | 3,610,397 |  | 1,860,112
Loans | 3,631,287 |  | 1,878,167
Real estate | Commercial real estate ("CRE") | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 4,702 |  | 15,351
Real estate | Commercial real estate ("CRE") | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 3,334 |  | 0
Real estate | Commercial real estate ("CRE") | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 2,259 |  | 0
Real estate | Acquisition, development, and construction ("ADC") |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 104 | [1] | 0
Total past due | 104 |  | 0
Current | 254,066 |  | 156,296
Loans | 254,170 |  | 156,296
Real estate | Acquisition, development, and construction ("ADC") | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 0 |  | 0
Real estate | Acquisition, development, and construction ("ADC") | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 0 |  | 0
Real estate | Acquisition, development, and construction ("ADC") | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 0 |  | 0
Commercial and industrial ("C&I") |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 2,332,610 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 14,523 | [1] | 12,502
Total past due | 31,839 |  | 16,267
Current | 2,300,771 |  | 625,266
Loans | 2,332,610 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 13,254 |  | 0
Commercial and industrial ("C&I"), including SBA and PPP loans | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 410 |  | 917
Commercial and industrial ("C&I"), including SBA and PPP loans | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 3,652 |  | 2,848
Other loans |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Non-accrual | 99 | [1] | 1
Total past due | 197 |  | 10
Current | 24,212 |  | 2,306
Loans | 24,409 |  | 2,316
Other loans | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 9 |  | 8
Other loans | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | 89 |  | 1
Other loans | Loans 90 Days or More Past Due and Still Accruing Interest [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Total past due | $ 0 |  | $ 0
[1] | Includes all loans on non-accrual status regardless of the number of days such loans were delinquent as of March 31, 2021.

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