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LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) $ in Thousands | Jun. 30, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | $ 9,546,631 |  | $ 5,622,044
Non-accrual | $ 28,286 | [1] | $ 17,928
Number of loans receivables outstanding | loan | 11 |  | 3
Aggregate outstanding balance | $ 6,700 |  | $ 3,300
Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 193,503 |  | 37,534
30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 147,716 |  | 15,359
60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 10,791 |  | 918
Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 6,710 |  | 3,329
Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 9,353,128 |  | 5,584,510
Real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 8,179,487 |  | 4,978,195
Non-accrual | 14,085 | [1] | 5,425
Real estate | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 176,829 |  | 21,257
Real estate | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 147,202 |  | 15,351
Real estate | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 10,319 |  | 0
Real estate | Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 5,223 |  | 481
Real estate | Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 8,002,658 |  | 4,956,938
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 704,489 |  | 184,989
Non-accrual | 4,933 | [1] | 858
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 17,975 |  | 902
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 3,852 |  | 0
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 4,124 |  | 0
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] | Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 5,066 |  | 44
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] | Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 686,514 |  | 184,087
Real estate | Multifamily Residential and Residential Mixed-Use [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 3,503,205 |  | 2,758,743
Non-accrual |  |  | 1,863
Real estate | Multifamily Residential and Residential Mixed-Use [Member] | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 114,136 |  | 2,300
Real estate | Multifamily Residential and Residential Mixed-Use [Member] | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 110,712 |  | 0
Real estate | Multifamily Residential and Residential Mixed-Use [Member] | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 3,267 |  | 0
Real estate | Multifamily Residential and Residential Mixed-Use [Member] | Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 157 |  | 437
Real estate | Multifamily Residential and Residential Mixed-Use [Member] | Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 3,389,069 |  | 2,756,443
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 3,681,331 |  | 1,878,167
Non-accrual | 9,152 | [1] | 2,704
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 44,718 |  | 18,055
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 32,638 |  | 15,351
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 2,928 |  | 0
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] | Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans |  |  | 0
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] | Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 3,636,613 |  | 1,860,112
Real estate | ADC [Member] |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 290,462 |  | 156,296
Non-accrual | 0 | [1] | 0
Real estate | ADC [Member] | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 0 |  | 0
Real estate | ADC [Member] | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 0 |  | 0
Real estate | ADC [Member] | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 0 |  | 0
Real estate | ADC [Member] | Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 0 |  | 0
Real estate | ADC [Member] | Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 290,462 |  | 156,296
Commercial and industrial ("C&I") loans |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 1,343,869 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 1,343,869 |  | 641,533
Non-accrual | 14,109 | [1] | 12,502
Commercial and industrial ("C&I"), including SBA and PPP loans | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 16,574 |  | 16,267
Commercial and industrial ("C&I"), including SBA and PPP loans | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 506 |  | 0
Commercial and industrial ("C&I"), including SBA and PPP loans | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 472 |  | 917
Commercial and industrial ("C&I"), including SBA and PPP loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 1,487 |  | 2,848
Commercial and industrial ("C&I"), including SBA and PPP loans | Current |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 1,327,295 |  | 625,266
Other loans |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 23,275 |  | 2,316
Non-accrual | 92 | [1] | 1
Other loans | Total Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 100 |  | 10
Other loans | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 8 |  | 8
Other loans | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans | 0 |  | 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 | $ 23,175 |  | $ 2,306
[1] | Includes all loans on non-accrual status regardless of the number of days such loans were delinquent as of June 30, 2021.

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