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LOANS HELD FOR INVESTMENT, NET - Loan Categories (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Feb. 01, 2021 | Dec. 31, 2020
Loans held for investment, net: |  |  |  |
Total Loans | $ 9,546,631 | $ 9,546,631 |  | $ 5,622,044
Allowance for loan losses | (92,760) | (92,760) |  | (41,461)
Total loans held for investment, net | 9,453,871 | 9,453,871 |  | 5,580,583
Loans acquired on merger | 4,530,000 | 4,530,000 | $ 4,531,640 |
Small Business Administration ("SBA") Paycheck Protection Program ("PPP") [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 465,500,000 | 465,500,000 |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loan and leases carry guarantee rate | 100.00% | 100.00% |  |
Sold amount | $ 596,200 | $ 20,700 |  |
Paycheck Protection Program | Small Business Administration ("SBA") Paycheck Protection Program ("PPP") [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans |  |  |  | 313,400
Real estate |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 8,179,487 | 8,179,487 |  | 4,978,195
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 704,489 | 704,489 |  | 184,989
Real estate | Multifamily Residential and Residential Mixed-Use [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 3,503,205 | 3,503,205 |  | 2,758,743
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 3,681,331 | 3,681,331 |  | 1,878,167
Real estate | ADC [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 290,462 | 290,462 |  | 156,296
Commercial and industrial ("C&I") loans |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 1,343,869 | 1,343,869 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 1,343,869 | 1,343,869 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans | Small Business Administration ("SBA") Paycheck Protection Program ("PPP") [Member] |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | 1,343,869 | 1,343,869 |  |
Other loans |  |  |  |
Loans held for investment, net: |  |  |  |
Total Loans | $ 23,275 | $ 23,275 |  | $ 2,316

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